Secrets of a super hacker

SECRETS OF A
SUPER HACKER
By The Knightmare
TOC
Appendix

Text ripped verbatim
Note: Edited with clarity and space (win 98 word pad in Times new roman)
185 pages
6 yrs old
Kind of outdated and lot of it is garbage but its ok
Constant Sorrow
SECRETS
of a
SUPER
HACKER
By The KNIGHTMARE
Introduction by Gareth Branwyn
Sound Bytes from Reviews of
Secrets of a Super Hacker
"Secrets of a Super Hacker is a fascinating hacker cookbook that reveals the ease of
penetrating even the most stalwart computer system."
-The San Francisco Chronicle
"Not often do the contents of a book match its cover hype, but here is one book
that comes closer than most. Secrets of a Super Hacker, by The Knightmare, is
billed as 'every security manager's worst nightmare.' It does, indeed, descend into
the realm of security managers’ darkest fears."
- Info security News
... step-by-step instructions in meaningful hacking [using] a personal computer."
- Booklist
"Excellent. This work will appeal to many, especially business professionals as the
networks and e-mail become more commonplace."
-The Reader's Review
"...the most specific, detailed, general-purpose guide to electronic shenanigans I've
seen. Recommended."
- Reading for Pleasure
"All 205 pages are loaded with clear, concise, and very devious information. It is
well-written, sprinkled with wit and the Knightmare's own personal experiences."
- Selected Book Reviews
"Sysops may find it necessary to read this one, especially if their callers read it
first."
- BBS Magazine
"It's readable, interesting, informative, balanced, and accurate, with a nice spirit of
fun and swashbuckling!"
- <solmaker> on alt.books.reviews
"Secrets of a Super Hacker ... should be read by anyone who has the crazy notion
that his data is safe."
- ComputerWorld

Secrets of a
Super Hacker
By The Knightmare
Loompanics Unlimited
Port Townsend, Washington
This book is sold for information purposes only. Neither the author nor the
publisher will be held accountable for the use or misuse of the information
contained in this book.
Secrets of a Super Hacker
1994 by Dennis Fiery
Introduction (c) 1994 by Gareth Branwyn
Cover by Bart Nagel
Illustrations by Dan Wend/MEDIA Graphics
All rights reserved. No part of this book may be reproduced or stored in any form
whatsoever without the prior written consent of the publisher. Reviews may quote
brief passages without the written consent of the publisher as long as proper credit
is given.
Published by:
Loompanics Unlimited
P.O. Box 1197
Port Townsend, WA 98368
Loompanics Unlimited is a division of Loompanics Enterprises, Inc.
ISBN 1-55950-106-5
Library of Congress Catalog Card Number 93-86568

Contents
Introduction: Hackers:
Heroes or Villains?, by Gareth
Branwyn..........................................................................i
PART ONE
Before Hack
Chapter One: The
Basics..............................................................................................................
.......................3
Reading vs. Doing ?Opening Remarks?Equipment Moderns and Speed?
Communications
Software?Handy Features Data Capture?Past and Future?Days of Yore Live
On?Computer
Crime? Stealing Money Sabotage?Various Thieveries?The Seventh Crime?Hacker
Motivations
Chapter Two:
The History Of
Hacking.......................................................................................................13
First Came Hardware?YIPL and TAP?Computer Crime?2600?WarGames and Phrack
?Shadow
Hawk ?The Electronic Frontier Foundation
Chapter Three:
Researching The
Hack.................................................................................................................
...19
Targeting ? Collecting Information ? Some Unusual Research Methods ? On-line
Computer Simulators
and Tutorials ? Sorting Through Trash ? GIRK ? Found Disk Analysis ? Check Up ?
Damage to One Side ? Rips and Tears ? Imperfections ? Examining Screenshots ?
Snooping
Chapter Four:
Passwords And Access
Control.......................................................................................................35
Passwords ? Passwords Supplied by the User ? Possible Password Investigation ?
Password Studies ? Password Restraints ? Computer Generated Passwords: Fakery
and Analysis of Machine Generated Passwords ? Non-Random Machine-Generated
Passwords ? Programs are People Too
Brute Force Methods ? Foiling the Brute Force Assault ? Conclusion
Chapter Five:
Social
Engineering.......................................................................................................
.......................49
The Noble Form ? Hacker as Neophyte ? Hacker in Power ? Hacker as Helper ? Peak
Hours ? Other Hints Sample Social Engineering Situations ? Miscellaneous Social

Engineering Tips ? Other Roles In-Person Engineering ? Written Engineering ?
Request for Information ? Message From God ? Trouble in Paradise?
Chapter Six:
Reverse Social
Engineering.......................................................................................................
.........63
Overcoming Social Engineering Drawbacks ? Reverse Social Engineering Sabotage
Methods ? RSE
Case Study: The Translation Table ? Solving the Sabotage ? RSE Advertising
Methods ? Trouble for Nothing?
PART TWO
During Hack
Chapter Seven:
Public Access Computers And
Terminals..........................................................................................................
............................................71
Introduction to the Three Kinds ? CD-ROM Databases and Information Computers ?
Public Access
Terminals (PATs) ? The Bar Code Hack ? Hidden Commands ? College PATs ? Doing it
the E-Z
Way ? Shoulder Surfing ? Doing it BASICally ? Hardware Methods ? General
Purpose Microcomputers ? Breaking Free ? Freedom Means Free Roaming ? PACK
? Menu Simulation and Other Sneakiness ? Hiding Your Goody Basket ? Things to
Watch Out For
Chapter Eight:
On-Site Hacking: The Trespasser-
Hacker..................................................................................89
Closed-Circuit Television ? Biometric Systems ? Always a Way ? Acting for the On-
Site Hack ?
Piggybacking ? Other Successful Tricks & Antics ? Electronic Passive Computing ?
Radiation Comprehension ? Van Eck and Britton ? Ups and Downs
Chapter Nine:
Hacking At Home: Dialing Up Computers With Your
Modem...................................................99
Reality ? Who to Connect to ? Paying for the Pleasure ? Packet Switched Networks ?
Other
Networks ? Finding Dial-Up Numbers ? Dial-Up Security Measures ? Scrutinize the
Login Environment
Chapter Ten:
Electronic Bulletin Board
Systems................................................................................................105
Finding BBS Numbers ? Finding Hacker Boards ? Making Connections ? BBS Features
? BBS Exploitation ? Getting to Know You ? Bypassing BBS Security ? Running a BBS
? Midnight Masquerade ? Hack mail ? Crashing BBSs ? Trojan Horses ? Covering Up
Trojan Horse Activity ? While it is Running ? Before & After ? A Few Tips for the Do-
It-Yourselfer

Chapter Eleven:
Borderline
Hacking............................................................................................................
..........119
Hacking for Ca$h * Filthy Tricks * Bribery * Booze and Broads * Bad Feelings
Chapter Twelve:
What To Do When
Inside............................................................................................................1
23
Hacker Motivations Revisited * Operating Systems * Looking Around * Commands
to Look For
and to Use * File Transfer Protocol (FTP) * Fun 'N Games The User Network *
Becoming a Superuser * Spoofing * Cryptography and DES * Bit by Bit Program
Employment * Viruses * Covert Channels * Get Out of Jail Free * Returning to the
Scene * Mission Accomplished Almost!
PART THREE
After Hack
Chapter Thirteen:
This Lawful Land …………………………………………………………………………………...139
State Computer Crime Laws * Traditional State Crime Laws * Criminal Mischief *
Burglary *Fraud * Larceny * Theft of Trade Secrets + Receipt of Stolen Property *
Theft of Services or LaborUnder False Pretenses * Interference With Use Statutes *
Traditional Federal Crime Laws *Conspiracy * 661, 2113, 641, 912, 1343, 1361,
Etc. * Federal Computer Crime Laws, Or: It's 10:30, DoThey Know Where the
Hackers Are? * Conclusion
Chapter Fourteen:
Hacker Security: How To Keep From Getting
Caught……………………..................................145
In Researching * In Social Engineering * Dialing In * Laptop Hints * Your On-the-
Road Kit *
System Tiptoeing * Lessons From the Hospital + BBS Protection * Other On-line
Security Steps *
Security Logs * In Public and On-Site * While Off-Line: Minimizing Losses *
Maintaining Your
Computer * Keeping Your Other Stuff * Conclusion: How to Get Caught
Chapter Fifteen:
Conclusion…………………………………………………………………………………………….161
The Hacker's Ethic * My Code of Ethics * Combining Principles * My One-Person
Tiger Team *
Principles Combined * Concluding Thoughts * Some Thoughts to the Concerned
Administrator *
Some Thoughts to the Concerned Hacker
Further Reading 169
The Books * Other Sources

Glossary 173
APPENDICES
Appendix A: Explanation of Some ASCII Codes 185
Appendix B: Common Defaults 189
Appendix C: Common Commands 191
Appendix D: Novice Word List 193
Appendix E: job-Related Word List 197
Appendix F: Technical Word List 199
Appendix G: Social Security Number Listing and ICAO Alphabet 201
Appendix H: Additional R/SE Role Playing Situations 205
Introduction:
Hackers: Heroes or Villains?
by Gareth Branwyn
Hacking in the Village
"Where am I?"
"In the Village."
"What do you want?"
"Information."
"Whose side are you on?"
"That would be telling. We want... information... information... information."
"Well you won't get it."
"By hook or by crook, we will!"
Remember the '60s TV show The Prisoner? Created by and starring Patrick
McGoohan, this surrealist series was basically a platform for McGoohan to explore
his own fears of modem surve-illance/spy technology, behavioral engineering, and
society's increasing ability to control people through pacifying pleasures.
He was convinced that all this might soon mean the obliteration of the individual
(expressed in the defiant opening shout: "I am not a number, I am a free man!").
McGoohan's #6 character became a symbol of the lone individual's right to remain
an individual rather than a numbered cog in the chugging machinery of the State.
McGoohan, a Luddite to be sure, despised even the TV technology that brought his
libertarian tale to the masses. He saw no escape from the mushrooming techno-
armed State short of out-and-out violent revolution (it was, after all, the '60s!). As
prescient as The Prisoner series proved to be in some regards, McGoohan failed to
see how individuals armed with the same tech as their warders could fight back.
The #6 character himself comes close to revealing this in a number of episodes, as
he uses his will, his ingenuity, and his own spy skills to reroute #2's attempts to
rob him of his individuality.

One doesn't have to stretch too far to see the connection between The Prisoner and
the subject at hand: hacking. With all the social engineering, spy skills, and street
tech knowledge that #6 possessed, he lacked one important thing: access to the
higher tech that enslaved him and the other hapless village residents. Today's
techno-warriors are much better equipped to hack the powers that be for whatever
personal, social or political gains.
In the last two-part episode of the series, #6 finally reveals why he quit his
intelligence job: "Too
i
many people know too much." Again, this expresses McGoohan's fear that the
powers that be were holding the goods on him and everyone else who was bucking
the status quo at that time. He probably didn't mean "people" as much as he
meant "governments." It is this fact, that "too many
[governments/megacorps/special interest groups] know too much" that has
provided an important motivation to many contemporary hackers and has fueled
the rampant techno-romantic myths of the hacker as a freedom of information
warrior.
Let's look at a number of the mythic images of the hacker that have arisen in the
past decade and explore the reality that they both reflect and distort:
The Hacker as Independent Scientist
The first image of hackerdom to emerge in the '60s and 70s was of the benevolent
computer science student pushing the limits of computer technology and his/her
own intellect. Computer labs at MIT, Berkeley, Stanford and many other schools
hummed through the night as budding brainiacs sat mesmerized by the promise of
life on the other side of a glowing computer screen. These early hackers quickly
developed a set of ethics that centered around the pursuit of pure knowledge and
the idea that hackers should share all of their information and brilliant hacks with
each other. Steven Levy summarizes this ethic in his 1984 book Hackers: "To a
hacker a closed door is an insult, and a locked door is an outrage. Just as
information should be clearly and elegantly transported within the computer, and
just as software should be freely disseminated, hackers believed people should be
allowed access to files or tools which might promote the hacker quest to find out
and improve the way the world works. When a hacker needed something to help
him create, explore, or fix, he did not bother with such ridiculous concepts as
property rights."
While this ethic continues to inform many hackers, including the author of the book
you are holding, it has become more difficult for many to purely embrace, as the
once innocent and largely sheltered world of hackerdom has opened up onto a vast
geography of data continents with spoils beyond measure, tempting even the most
principled hackers. The Knightmare weaves his way in and out of these ethical
issues throughout Secrets of a Super Hacker.
The Hacker as Cowboy
The cowboy has always served as a potent American myth of individuality and
survivalism in the face of a harsh and lawless frontier. It is no accident that
William Gibson chose cowboy metaphors for his groundbreaking cyberpunk novel
Neuromancer (1984). Case and the other "console cowboys" in the novel ride a

cybernetic range as data rustlers for hire, ultimately sad and alone in their harsh
nomadic world. They are both loner heroes and bad assed predators of the law
abiding cyber citizenry they burn in their wake.
I don't think I need to tell readers here what impact Gibson's fictional world has had
on fueling hacker fan-tasies or what potent similarities exist between Gibson's world
and our own.
Like the cowboy tales of the wild west, the myth of the hacker as cowboy is
undoubtedly more image over substance (as are most of the myths we will explore
here), but there are some important kernels of truth: a) hackers are often loners,
b) there are many nomadic and mercenary aspects to the burgeoning cyberspace of
the 1990s, and c) it is a wide open and lawless territory where the distinctions
between good and bad, following the law and forging a new one, and issues of free
access and property rights are all up for grabs (remember the Indians?). Not
surprisingly, Electronic Frontier Foundation co-founder John Perry Barlow (a
Wyoming cattle rancher himself) chose frontier metaphors when he wrote his
landmark essay "Crime and Puzzlement" (Whole Earth Review, Fall 1990). The first
section of this lengthy essay, that lead to the birth of the EFF was entitled,
"Desperadoes of the DataSphere."
The Hacker as Techno-Terrorist
When I was a budding revolutionary in the 70s, with my Abbie Hoffman and Jimi
Hendrix
posters and my cache of middle class weapons (.22 caliber rifles, .12 gauge
shotgun, hunting bows), 1, like McGoohan, was gearing up for the Big
Confrontation. With a few friends (who seemed more interested in firearms than
revolutionary rhetoric), I used to do maneuvers in the woods near my house. We
would fantasize how it was all gonna come down and what role we (the "Radicals for
Social Improvement") would play in the grand scheme of things. It doesn't take a
military genius to see the futility of armed force against the U.S. military on its own
turf. The idea that bands of weekend rebels, however well trained and coordinated,
could bring down "The Man" was pure romance. Part of me knew this the same part
of me that was more interested in posture than real revolution and in getting laid
more than in fucking up the State. My friends and I were content to play act, to
dream the impossible dream of overthrow.
One of the first "aha's" I had about computer terrorism in the late '80s was that the
possibilities for insurrection and for a parity of power not based on brute force had
changed radically with the advent of computer networks and our society's almost
complete reliance on them. There was now at least the possibility that groups or
individual hackers could seriously compromise the U.S. military and/or civilian
electronic infrastructure. The reality of this hit home on November 2, 1988, when
Robert Morris, Jr., the son of a well known computer security researcher, brought
down over 10% of the Internet with his worm
(a program that self propagates over a network, reproducing as it goes). This event
led to a media feeding frenzy which brought the heretofore computer underground
into the harsh lights of television cameras and sound bite journalism. "Hacker
terrorists," "viruses," "worms," "computer espionage"...all of a sudden, everyone
was looking over their shoulders for lurking cyberspooks and sniffing their computer
disks and downloads to see if they had con-tracted nasty viruses. A new computer
security industry popped up overnight, offering counseling, virus protection
software (sometimes with antidotes to viruses that didn't even exist!), and work
shops, seminars and books on computer crime.

Hysteria over hacker terrorism reached another plateau in 1990 with the execution
of Operation Sundevil, a wide net Secret Service operation in tended to cripple the
now notorious hacker underground. Like a cat chasing its own tail, the busts and
media coverage and additional busts, followed by more sensational reportage,
created a runaway loop of accelerating hysteria and misinformation. One radio
report on the "stealing" (copying, actually) of a piece of information "critical to the
operations of the Emergency 911 system" for Bell South opined: "It's a miracle that
no one was seriously hurt." Of course, the truth turned out to be far less dramatic.
The copied booty was a very boring text document on some management aspects of
the Bell South system. For a thorough and lively account of this and many of the
other arrests made during Operation Sundevil, check out Bruce Sterling's The
Hacker Crackdown (Bantam, 1992).
Whatever the truth of these particular incidents, computer crime is here big time
and the boasts of even the most suspect hacker/cracker are usually at least
theoretically possible. Computer terrorism has yet to rear its head in any
significant fashion, but the potential is definitely there. This is very unsettling
when you think how many people can gain access to critical systems and how many
loony tunes there are out there armed with computers, modems, and less than
honorable intentions. Wireheads of every gauge would do well to study volumes
like Secrets of a Super Hacker to stay abreast of the game and to cover their
backsides should the proverbial shit hit the fan.
The Hacker as Pirate
Next to "cowboy," the most Potent and popular image of the hacker is that of a
pirate. Oceanographic and piracy metaphors are equally as common in cyberculture
as ones about lawless frontiers and modem-totin' cowboys and cowgirls. People
talk of "surfing the edge," and the "vast oceans of the Internet." Bruce Sterling's
near future novel about data piracy was named Islands in the Net. In it, third world
countries and anarchist enclaves operate data havens, buying and selling global
information through the world's wide
bandwidth computer networks.
Anarchist theorist and rantmeister Hakim Bey penned an essay called "Temporary
Autonomous Zones
(or T.A.Z.)" inspired by Sterling's data islands. Bey sees in the rapidly growing
techno-
iv
sphere of our planet the possibilities for a new form of nomadic anarchic culture
that might resemble the sea-faring pirate societies of the 18th century. Using all
the resources of the global nets, individ-ual cybernauts can come together to form
tempo-rary and virtual enclaves. These bands can wreak havoc, throw a party,
exchange intelligence, or whatever else they want. Once the deed is done, the
party over, the nomadic bands simply disappear back into the dense fabric of
cyberspace. While de-cidedly romantic, the TAZ idea is attractive to many hackers
and cyberspace residents who daily feel the fluidity of movement and the potential
for invisibility offered on "the nets."
Of course, let's not kid ourselves, pirates were mainly concerned with stealing
things. In cyber-space, piracy becomes a more ambiguous and con-tested can of
worms. Are you really taking some-thing if you're simply looking at it or making a
copy of it? If you copy copyrighted material - let's say an image - and then alter it

significantly, to the point that it is almost unrecognizable, have you violated the
copyright? What if you're using it as raw materials in a piece of art, like collage?
What does stealing mean when what is stolen is nothing more than a particular
assemblage of electrical im-pulses? I regularly download recognizable audio bytes
from networks, process them in a sound edi-tor, and then use them in various
audio art projects. Am I stealing? If I publish the work commercially, THEN is it
plagiarism? All of these questions about sampling, copying, cutting, pasting, re-
purposing, and altering have become the thorny legal and ethical issues of our
cybernetic age. Hackerdom is one of the domains that is rapidly fueling the fire.
The Hacker as Biblical David
When liberal and fringe media want to feel good about hacking and cracking they
start invok-ing images of the hacker as a do-gooder David against a
military/industrial Goliath. This myth of the hacker, based on the "parity of power"
theme discussed above can bring comfort to those of us who are paranoid about
megacorporate and gov-ernment big brothers. However over-romanticized this
myth is, there is comfort to be found in the knowledge that individuals can
penetrate even the most behemoth systems. If big brother gets too big for his
britches, "Davidian" (?) hackers are standing by to do some necessary tailoring.
The Hacker as Security Informant
Another do-gooder myth revolves around the hacker as an either self-appointed or
hired security checker. Many hackers, true to their ethos of simply wanting to push
the limits of their ability and not to cause harm, will report holes in security after
they've breached them. To the hacker who is inter-ested in the gamesmanship and
challenge of pene-trating a system, tipping off the system's adminis-trators means
a new level of challenge should they ever return. Hackers who are hired for
purposes of testing system security, called "tiger teams," also work to compromise
the security of a system to find weaknesses. Often times, these hired guns are
convicted computer criminals who "go straight." Several members of the legendary
Legion of Doom, caught in the Operation Sundevil busts, formed COMSEC, a
computer security team for hire. While many hackers bristle at such turncoat
maneuvers, other more politically neutral hackers point out that it doesn't really
matter to them who they're working for as long as they get to hack.
The Hacker as U.S. Cavalry
just as Hollywood movies raised the lowly dirt-lickin' cowboy to mythic status, it is
now pre-senting hackers as a tech-mounted U.S. Cavalry, a cyberpunk version of
Mighty Mouse, here to save the day - and save the movie - in the final seconds.
Movies such as WarGames, Sneakers, Jurassic Park, and TV shows such as Max
Headroom glamorize hackers, often portraying them as misguided geniuses who
finally see the light and prevent calamities they're often responsible for in-itiating.
At the same time that the mainstream me-dia has demonized hackers, Hollywood
has ro-manticized them. John Badham's 1983 film WarGames probably did more to
stimulate interest in hacking and phone phreaking among young people than
anything before or since. Numerous
v

legendary hackers have credited that film as their chief inspiration and raison
d'etre. All these films have also played into the myth of the evil govern-ment and
megacorps who deserve the harassment that the hacker protagonists dish out. As
this intro-duction is being written, rumors are flying fast and furious that a number
of near-future hacker/cyberpunk TV shows are in the works. It will be very
interesting to see how Hollywood con-tinues to re-invent the hacker.
The Hacker as cyborg
Ultimately computer hacking and net navigat-ing, and the images and fantasies
surrounding them, represent something greater than the sum of the parts outlined
here. It is this writer's opinion that hackers represent the scouts to a new territory
that is just now beginning to be mapped out by others. Hackers were the first
cybernauts, the first group of people to understand that we as a species are about
to disappear into a cyberspace at least similar in function to that posited by William
Gib-son in his 80's fiction. As Manuel De Landa explains in his book War in the Age
of Intelligent Machines (MIT, 1991), we are forging a new symbiotic relationship
with machines via computers. The na-ture of this relationship and the level of
individual freedom afforded by it has a lot to do with how hackers, visionary
scientists, and the first wave of cyber-settlers go about their business. While De
Landa is very laudatory toward the "freedom of in-formation" ethic and
developmental ingenuity of hackerdom, he cautions those who wish to make too
much trouble for individuals and organiza-tions, leading to retaliation, escalation of
tensions, and increased paranoia. He writes: "...[S]orne elements of the hacker
ethic which were once indispensable means to channel their energies into the quest
for interactivity (system-crashing, physical and logical lock-busting) have changed
character as the once innocent world of hackerism has become the mul-timillion-
dollar business of computer crime. What used to be a healthy expression of the
hacker maxim that information should flow freely is now in danger of becoming a
new form of terrorism and organized crime which could create a new era of
unprecedented repression. "De Landa. argues elsewhere in Machines that the U.S.
government's, especially the military's, desire to centralize decision-making power
has been seri-ously compromised by the personal computer revolution. He
speculates that those outside the military-industrial machinery have only a few
years to develop a new and truly decentralized sys-tem of networks before the
military devises a new tactical doctrine that subsumes the distributed PC.
The images of hacking: coming in under the wire of mainstream society, cobbling
together tech-nology for individual and group purposes, over-coming limitations,
and all the other real and imagined dimensions of hacking, have become part of a
new academic trend that uses the sci-fi image of the cyborg as a model of late
twentieth century humanity. These academics have embraced cyber-punk sci-fi,
the politicized image of the hacker, and postmodern ideas about posthumanism (a
future of human/machine hybridization). Anyone who spends most of their waking
hours patched into a PC and the Internet or in hacking code has felt the margins
between themselves and their machines getting very leaky. Hackers were the first
to experi-ence this " many others are now following in their digital footsteps.
Hacking has become trendy and chic among people who, if pressed, couldn't even
define an operating system. The "idea" of hacking has migrated far from the actual
act of hacking. It has become a cultural icon about decentralized power for the turn
of the millennium.
The Knightmare's Vision

Behind all these lofty notions lies the tedious and compelling act of the hack itself.
Hacker-monikered "The Knightmare" presents his complex view of hacking in
Secrets of a Super Hacker. In this classic hacker cookbook, the author has gone to
great pains to explain the massive width and breadth of hacking, cracking, and
com-puter security. With Sherlock Holmes-like compul-sion and attention to detail,
he presents the history of hacking, the how-tos of hacking, the legal and ethical
issues surrounding hacking, and his own personal reasons for hacking. Numerous
examples and "amazing hacker tales" take the reader inside
each level of the hack. Reading Secrets will change the way you look at computers
and computer se-curity. It has already been very valuable to me. I am a smarter
computer/net user now and. much more attuned to computer security.
When Patrick McGoohan conceived of The Prisoner he wanted to create a show that
would de-mand thinking. He wanted controversy, argu-ments, fights, discussions,
people waving fists in his face. You might love the show, you might hate the show
(or both), but you would HAVE to talk about it. Computer hacking and the wooly
frontiers of cyberspace are similar domains of controversy. In the true spirit of
freedom of information, Secrets of a Super Hacker is being made available to
anyone who cares to read it. It is my hope that it will help keep the debate alive
and that those who make use of its privileged information will do so responsibly and
without malice.
Be Seeing You,
Gareth Branwyn August 29,1993 Nantucket Island, Mass.
vi
PART ONE
BEFORE THE HACK
1
Page Intentionally left blank
2
"Given that more and more information about individuals is now being stored on
computers, often without our knowledge or consent, is it not reassuring that some
citizens are able to penetrate these databases tofind out what is going on? Thus it
could be argued that hackers represent one way in which we can help avoid the
creation of a more centralized, even totalitarian government. This is one scenario
that hackers openly entertain.
Tom Forrester and Perry Morrison in Computer Ethics
Chapter One:
The Basics
Reading vs. Doing
There are two ways to write a book about computer hacking.
The first is to write an encyclopedic account of every known system and its dialup
numbers, passwords, loopholes, and how to increase one's access once inside.

There is nothing particularly wrong with this approach except that by publica-tion
time much of the contents will likely be out-dated. And surely, after word leaks to
the computer sites of the world the remaining information will be rendered non-
functional. Such a specific approach, while exciting, is best left to periodicals,
which can keep readers updated on the constantly changing security frontier.
Indeed, there are both print and on-line publications which attempt to do just that.
The second way to write a book about com-puter hacking is to write an encyclopedic
account of the methods by which security is breached and systems penetrated.
This is a much more agreeable solution to the problem of how to distribute
changing information. The readers of such a book can then follow those methods,
those algorithms, add some of their own creativity, and will never end up facing a
situation drastically different from the ones the text has prepared the hacker to en-
counter. Naturally, way-to-write-a-book Number Two is the way this book has been
written.
At some points during the course of writing this book I've found that to talk about
certain informa-tion requires knowledge of another aspect of hacking entirely. I
tried to keep this book flowing in a logical order, conducive to understanding, but
occasionally you will find ripples in the flow.
If you come across a term or situation that the book hasn't yet prepared you for,
forget about it. You'll learn soon enough. Or look in the glossary you might find
the answer you seek there. Com-puter hacking is a subject which contains a volu-
minous amount of information. Repeatedly, as I prepared the manuscript, I had to
decide whether or not to go into great detail in a particular area, or allow you to
discover certain inside tricks on your own. Sometimes I compromised, sometimes I
did-n't. Some things I left out because they were too scary. When all is said and
done, the important part isn't the writing of the book, it's the reading of it, and the
actions that result from the reading. Hacking is about doing something, for yourself
and on your own. It's not about reading about doing something. I will gladly point
you in the right di-
3
rection, but I won't be your guide once you're on your way.
Speaking of books being read, it is often a wonder that they ever do get to that
readable finished state at all. Thank you R.S. and j for critiquing selections from
this book; thanks to the people at Loompanics for recognizing that the Constitution
does, after all, allow freedom of the press; and to the many hackers and crackers
who offered sug-gestions: Morris, Janet, Sex Pack, Carl Fox and the happy Gang Of
Demon Street.
Opening Remarks
This book will show you various methods you can use to break into computer
systems.
In some ways this is harder to do than it used to be. Nowadays people are more
strict, more cau-tious about security. That's how it seems, anyway. But there are
plenty of holes still left in any sys-tem's armor. System managers can tighten up
com-puter security as much as they want but there will always be ways to get
around their efforts. Re-member the first rule of hacking: Whatever a . hu-man
mind can achieve, another can also achieve. Whatever one mind can hide, another
can discover. People tend to think and act alike, and it is this sameness of thought
that you, the hacker, will exploit.

What is a hacker? I'm going to give a definition now, and if you don't fit the
description I give, you can just close this book and throw it away:
A hacker is a person with an intense love of something, be it computers, writing,
nature or sports. A hacker is a person who, because he or she has this love, also
has a deep curiosity about the subject in question. If a hacker loves computers,
then he or she is curious about every aspect of computers. That curiosity extends
also to the ways other people use their computers. Hackers have re-spect for their
subject. For a computer hacker that means he respects the ability of computers to
put him in contact with a universe of information and other people, and it means he
respects those other people and does not intentionally use this knowl-edge of
computers to be mischievous or destruc-tive. That sort of thing is for social-outcast
junior high school kids. The serious computer hacker simply wants to know
everything there is about the
world, and the world of computers. The True Computer Hacker is a computer
enthusiast and more importantly, a Universe enthusiast.
You should already be enthused. Are you ready to learn?
Equipment
There is only one piece of equipment you need to be a successful computer
hacker... a brain. That's right - you don't even need a computer. In fact, you might
be better off not having one as you will see later on. However, to start out you will
want to have a computer, a modem, and a tele-phone line close by so you can
connect to the out-side.
It's inconsequential what kind of computer it is. What's more important are the
modem and the communications software you use with it.
Modems And Speed
Remember the old puzzler, "Which weighs more: a pound of feathers or a pound of
lead?" Well, here's the same puzzler with a modern twist: "Which transmits data
faster: a 600 baud modem, or a 600 bits-per-second modem?" The answer, of
course, is "Both transmit data at the same rate!" But the real answer gets a little
more omplicated. Let me explain.
C IlBaud" is the measure of the rate at which a modem sends and receives
information. Below speeds of 600 baud, the baud rate is equal to bits-per-second.
Due to the restrictions of telephone equipment, high speed modems may transmit
far fewer bits-per-second than their baud rate. For example, a 2400 baud modem
may only be sending 1200 bits-per-second.
For traditional reasons, modem speed is still stated in baud. While a hacker should
be aware of the difference between baud rate and bits-per-second, the important
thing to remember about modem speed is: the faster, the better. Just don't expect
a 9600 baud modem to be four times as fast as a 2400 baud modem.
Five years ago, 300 baud moderns were quite popular. Today, 9600 baud modems
are fairly common. Higher speed modems, such as 14,400
4
baud and 19,900 baud, are now available in fairly inexpensive models. Many of the
services you connect to will not be able to accomodate these higher speeds;
however, a high-speed modem can always "step down" and connect at a slower
speed

when necessary.
Hacking is a hobby that requires little equipment; when it is necessary to buy
something, you should try to buy the best available. This doesn't mean you should
get what the salesperson or a magazine review says is best. It means, get what is
best suited to your needs. You will want your mo-dem to be fast. When I got my
first modem, I thought of 140 baud as being the slowpoke. Now I look at the 300
baud crawler I used to use and wonder how I ever managed to stay interested when
the words dribble across the screen at such an agonizingly slow pace.
Realize that whatever speed modem you get, it will usually run even slower than
advertised. When there is static on the line, the modem is forced to resend data
over and over until it has been sent or received correctly. Modems may run at half
their listed speed, or even slower if they're in a particularly bad mood. They get
even more snailish when you're calling long distance, or you're calling me computer
through another through another (to make your call harder to trace back to its
source), or if the remote computers are getting heavy usage.
For all of these reasons it's crazy not to get a fast modern. It will make every bit of
electronic communication much more enjoyable.
Communications Software
It's hard to find truly splendid communications software, and yet it is the software
(in conjunction with a fast, high-quality modem) which will de-termine how much
enjoyment or frustration you get from your on-line interactions.
There are lots of communications software ("terminal emulators" or "term
programs") out there.
Just because a particular package comes with your modem doesn't mean you
should feel obli-gated to use it. A good piece of telecommunications software will
have many of the following features. For the hacker, it is necessary to have all
these features. Well, maybe it's not necessary, but it will sure make your hacking
experience more pleasurable.
Handy Features
The monitor on your computer was probably specially designed for your computer.
When you dial who-knows-where over the phone, you can easily be talking to some
computer with a com-pletely different screen design than your own. Con-sequently,
certain standards (rules of behavior for monitors to follow) have been devised. If
you call up a hundred different computers, there will be many differences between
the characters each can display, the control codes used to perform various screen
functions, and so on. Your communications program, or "comm program," should
be able to adjust to a wide range of these codes and charac-ters. This feature is
known as terminal emulation. Software that can't do that will often represent data
from the remote computer in peculiar ways, or as garbage characters. Your comm
program must be able to emulate a good number of terminals, such as ANSI, VT52
and VTIOO. It is also handy for the software to have a translation table - the ability
to translate incoming and outgoing characters to other characters.
The terminal program you choose should be able to send and receive files using the
Xmodern, Ymodem, Zmodern, and Kermit protocols. A proto-col is a set of rules.
You see, if you're "ing to move files between two completely dissimilar computers,
those machines need to know how to talk to each other. These file transfer
protocols set up specific guidelines for the two computers to follow regard-ing how
the file should be sent and received. Each protocol has its own set of advantages

and applica-tions. The Zmodem protocol transfers files fast, and with good error
recovery, but it isn't as prevalent as the original Xmodem. Ymodem is another im-
provement on Xmodern, but its error detection isn't as keen - only use it on clean
phone lines. Kermit is used on many university mainframes for speedy, efficient
file transfer. Make sure your terminal software has at least these four protocols.
Choose software that allows you to enter "AT" commands. ATtention commands
were developed by Hayes to allow the user to control the modem. They have been
adopted for most makes of modern. AT commands allow you to program the
modem to
5
dial, go on line, go off line, and perform various other functions. You should also be
able to shell to your computer's operating system while maintaining the connection
- sometimes you will want to run another program while on-line. The software
should allow you to be able to store many phone numbers, names, and comments
for a large number of dialups. You should be able to store more than just the ten
digit phone number extensions and special codes should be pro-grammable, as well
as sign-on macros for faster connections. It is also helpful to have auto-dial ca-
pacity, which repeatedly calls a busy phone num-ber until the line is free. Overall,
the program you use must be pleasant and easy to use. If one program doesn't
suit all your needs keep several on hand and use whichever you need when you
need its special services. Generally I tend to stick with the PC Tools Desktop comm
program. It doesn't have too many advanced features, but its ease of use more
than makes up for that. ProComm Plus for the IBM and Macintosh is the Lotus 1-2-
3 of communications, software. It's a huge package that includes every conceivable
feature you'll ever need. There are also many low price (free) alternatives in the
world of shareware and public domain software. QModem is one good shareware
communication program for IBM computers.
There is one final necessity for the hacker:
Data Capture
Your terminal program should have a data cap-ture feature. This means that as
information gets sent through your modem and put onto the screen, you should be
able to capture it in a disk file.
It's important for you to keep the data capture feature on whenever you're using
your modem. You do this for several reasons. When I'm logged in somewhere, I
like to poke into all the text files I can find, but I don't like to waste my time on the
sys-tem by actually reading them while on-line. In-stead, I turn on my data
capture, store what can be hundreds of pages of text in separate files, then sort
through the data later, offline, at my leisure. (At other times it is more appropriate
to simply transfer the files; what one does depends on circum-stances.) Data
capture is also handy to pick up control codes and text that scrolls off the screen
too fast for you to read. And sometimes text is immediately erased after it's put on
the screen, either for security reasons or due to faulty software. With data cap-ture
you retain a permanent record of that text. In any event, it's nice to have an
official record of your hacking activities that you can use for reference and research.
One time I called up a bulletin board (BBS) that was run by a local company, mostly
for the pur-pose of advertising its products. The modems con-nected, I pressed
Enter a couple times, and I got the usual random characters on the screen, then
the login prompt came on. It took a little longer than usual to get to the login

prompt, and I was wonder-ing about that, but nothing seemed really unusual so I
went about my business.
Later, I was going over the print outs I made of the break-in and I took a second
look at what at the time seemed to be just normal login garbage. In the middle of
the nonsense symbols was this: "d-b". And on the next line, sandwiched between
two plus signs, this: "ye!". On the surface this doesn't look too interesting, but
think about it: put "d-b" and "ye!" together and you get "d-bye!". What I was
looking at was the last half of the word "good-bye!".
From using the BBS I knew that "good-bye!" was the last thing one sees before
logging off. In other words, I had called the system just after someone else had
logged off, and I had gotten the tail end of their log-off message. This meant there
was something wrong with the way the remote software handled disconnections.
This meant there was a bug that could be exploited.
I logged onto the system again, and the first thing I did was go to the "User Log" to
find the re-cord of my last login to the system. The person who had been using the
BBS before me was a regular User of the system and, sure enough, according to the
log she had logged off just seconds before I was recorded as having logged in.
Later I was able to incorporate my knowledge of this flaw to make myself a system
operator by calling up and connecting soon after the real sys-tem operator had
finished a scheduled mainte-nance check. I wrote a letter explaining to him what
6
I had done, and how. Over the next few days we corrected the problem.
So you see, sometimes weird things happen while you're logging on or off, but
anomalies can occur at any time. The moral of this story is be pre-pared to capture
this weirdness, and be prepared to analyze it when you find it.
You never know when something out-of-the-ordinary is going to happen, like the
sys-tem operator (sysop) coming on and doing system maintenance while you
watch. I've had that hap-pen to me more than once. In fact, there was one week
in which it happened twice.
When I was in high school there was one day near the end of September that I was
sick, so I was staying home from school. Instead of rushing off to the bus stop, I
was on my computer, dialing BBSs. The first day I was sick, I had just finished
logging onto a system and was about to read my e-mail when the sysop
interrupted. "I have to do some-thing real fast," he typed, "and I'm late for
school." Then he went about doing whatever it was he had to do. He went into the
back screens of the bulletin board system program, then shelled out to his hard
drive, and came back in again. He was doing every-thing so fast I couldn't keep
track of what was go-ing on, but later, after I'd logged off, I was able to go through
the file I'd made of the event, and ana-lyze it thoroughly. The information I
learned from watching that sysop fix his system did not help me break in anywhere,
but it taught me more about how telecommunication systems work. And that's the
whole purpose of hacking.
A few mornings later, I was on another system and almost the same thing
happened. Another sy-sop was late to an appointment, but before he went he just
had to do some last minute rearranging. This time I was able to understand as I
watched what was going on: one of the things the sysop did was to validate a new
user's password (a dumb thing to do in front of somebody, but maybe he didn't
realize I could see what he was typing). Since I was capturing the event in a text
file as I watched it, there was no need for me to scramble for a pen to write down
the passwords as I saw them scroll across my screen.

An alternative to data capture is to have your printer running continuously. There
are people who do this, but it's always seemed to me to be a complete waste of ink,
paper, time (especially if you have a slow printer) and electricity. Also, a printer
won't be as efficient as your communica-tions program at capturing strange control
codes and foreign symbols. You're better off capturing data in files, then using a
word processor to sort through those files, erase what you don't need, and then
perhaps print out the rest.
Past and Future
As you read about the many facets of hacking, you will be introduced to more
equipment, tools, software and hardware that will be of interest to hackers who
wish to try their expertise in more specialized areas of interest. For now though, all
you need is the understanding that...
Days Of Yore Live On
Men you start reading through the literature of data security, you begin to get
worried.
Gone, it seems, are the days of "Joshua doors" as in the movie WarGames. Gone
are the system bugs and loopholes, the naively entered "PASSWORD" used as a
password. Gone, it seems, is the reverent awe people once held for the lone
hacker, cracking secret government databases in the middle of the night. Gone are
the lone hackers. It seems. But all of this really isn't true! As recently as just a few
years ago, Robert Morris, Jr., was hacking into computers using system bugs that
he himself had discovered. These weren't even new bugs -they were old ones that
no one had ever noticed or bothered to correct before! Who knows how many more
similar bugs like it are out there, waiting to be manipulated? And the trap doors
will always be there as well: it is the programmer's vanity that leads him to stylize
otherwise joint or corporate software by inserting covert code, either for benign,
"jokey," Easter Eggs purposes - or to wreak havoc later on. < An Easter Egg in the
computing sense is some unexpected, secret thing you can do with a piece of
software that the programmer put in but doesn't tell anyone about.> And don't
forget all the stupidity: the test accounts and demo modes, the default security
7
measures that nobody bothers to delete or change. In July 1987, a bunch of Chaos
Computer Club members hacked their way through the network, from an entry in
Europe, to NASA's SPAN system (Space Physics Analysis Network). These crackers
exploited a flaw in the VMS infrastructure which DEC Corporation had announced
was remedied three months earlier. There must be hundreds of VAX computers still
out there, still running the faulty parts of the operating system. Even with the
patch in place, the Chaos members reportedly were laughing themselves silly over
the often trivial passwords used to "protect" the system. Some of the passwords
were taken straight from the manu-facturer's manuals! On the one hand we have a
top secret VAX 11 / 785 computer with the full power of NASA to protect it; but on
the other hand there are approximately four thousand users of that com-puter.
Never can you get 4,000 people together and still keep secrets hushed up.
Hacking may seem harder than ever before, but it really is not. The culture may
have gotten more security-aware, but the individual user still lives in a world of
benign indifference, vanity, user-friendliness and friendly-userness. Users who are

in-the-know will always want to help the less fortunate ones who are not. Those
who aren't will seek the advice of the gurus. And so Social Engi-neering and
Reverse Social Engineering live on, as you shall discover within these pages. Ease
of use will always rule. The "dumb" pass-word will be a good guess for a long time
to come.
After all, people just don't choose 116Fk%8l0(@vbM-34trwX51" for their passwords!
Add to this milieu the immense number of computer systems operating today, and
the stag-gering multitudes of inept users who run them. In the past, computers
were only used by the techno-literate few. Now they are bought, installed, used,
managed, and even programmed by folks who have a hard time getting their bread
to toast light brown. I'm not downgrading them - I ap-plaud their willingness to
step into unfamiliar wa-ters. I just wish (sort of) that they would realize what
danger they put themselves in every time they act without security in mind.
it is a simple and observable fact that most computer systems aren't secure. If this
isn't clear now, it certainly will be once you've read a few chapters of this book.
Ironically, many of the people who operate computer installations understand that
there is a problem with system security; they just don't do anything about it. It
seems incredibly naive, but it's true. There are lots of reasons why companies don't
increase computer security. Publicly or privately, they say things like:
• Extra security decreases the sense of openness and trust which we've strived to
develop.
• Security is too much of a nuisance.
• Extra security just invites hackers who love a challenge.
• It would be too costly or difficult to patch exist-ing security loopholes.
• The reprogramming could open up new secu-rity problems.
• We've never had a security problem before!
• The information we have here is not important to anyone but ourselves; who
would try to break in
here?
• But we just had a security breach; surely they won't come back!
• Didn't all those computer hackers grow up and go on t o better things?
There are different reasons why each of these statements is either wholly or
partially incorrect. The last one is certainly false as any reader of this book should
be quick to point out. Computer hacking (as well as the misuse of computers) will
always be a contemporary issue because of the great value computers have in our
daily lives. Some of these sayings also have their validity. In any case, the people
who run computer installa-tions (call them sysops, system managers, com-puter
operators or whatever) very often believe in these things, and so the window of
opportunity is left open. With a little work we can often ride the breeze inside.
Computer Crime
I would love to honestly be able to say that computer crime does not exist in the
world - but I can't, because it does. When you're talking about the bad stuff that
people do with computers, hack-ing truly is at the bottom of the list, and it certainly
is the farthest removed from traditional crimes -things like murder and burglary
which we feel in our hearts are wrong. True hacking is victimless, so
8

it is in my way of thinking only vaguely a crime. Perhaps it is immoral or wrong,
but there is much worse that can be done.
Computer crimes come in seven basic catego-ries, all of which are related to the
concept of "hacking" in some way. The seven categories are financial theft,
sabotage, hardware theft, software theft, information theft, and electronic
espionage. The seventh "crime" is computer hacking.
Stealing Money
Financial theft occurs when computer records are altered to misappropriate money.
This is often done by programming the computer to route money into a particular
bank account, usually 'by the use of a salami technique.
A salami technique is a method used to steal small sums of money over a long
period of time, with the assumption that such small sums won't be missed. The
criminal reprograms the computer at a bank or some other financial institution so
that fractions of pennies will be given to a dummy ac-count.
For instance an account might hold $713.14863, where the `863" occurs because of
the multiplica-tion involved to figure interest rates. Normally the computers would
say this person has $713.15 in the bank, rounding up the 4 to a 5. However, a
computer programmed with salami in mind would slice off those extra digits and put
them into a sepa-rate account. Now the person may only have $713.14 in the
account, but who's going to notice or complain about a missing penny?
The computer is not generating new money, it's only shifting valid money to an
invalid account. This can make salami thefts hard to detect. Once the criminal's
account has grown big enough on those fractions of pennies, he or she can
withdraw the money and most likely will get away with the crime. Many thieves
have tried this form of bank robbery, and many have been caught, but dozens or
hundreds of such operations could be going on today without anyone's knowledge
(or so the ##experts" claim).
The way investigators check to see if a salami technique is being used is to have
the computer make a list of all accounts, and how many times per day over a period
of days a transaction has oc-curred with that account. Next, any account that is
accessed an exorbitant number of times per day is checked to see how much money
each of these transactions represent. If it's tiny sums, someone's up to something!
While I don't condone such thievery, I feel obli-gated to point out where computer
criminals have gone wrong in the past and how to avoid future mishaps. Instead of
reprogramming the computer to immediately transfer those fractions of pennies to
an account, they would have been wiser to sim-ply subtract the amounts and keep
track of how much money is collected in an area separate from the account files.
Then, the portions of code which print out total bank holdings should be altered to
include that hidden figure in its summation, so those minuscule amounts aren't
missed. Once the figure reaches a certain point (for instance, some random value
over one hundred or two hundred dollars) only then should it be transferred to the
thief s account. I say some "random" value so every transaction on the thief s
account won't be exactly the same and thus suspicious.
Such thievery requires access to a computer; usually these crimes are committed
by employees of the institution at which the crime occurred, and so true hacking is
not necessary. However, when an employee with limited computer access or a
com-plete outsider pulls off a financial theft, computer hacking will surely be
involved.
Sabotage

Computer sabotage is the physical destruction of computer hardware or firmware,
or the tamper-ing or erasure of information stored on a computer. The point of
sabotage may be to force a competitor out of business, or, as is sometimes done
with ar-son, to get the insurance money. Computer hacking has only limited
involvement with sabotage, since it is the goal of most hackers to keep computers
se-cure, not to destroy them. Still, sometimes sabotage does creep into hacking in
limited ways. Reverse social engineering uses what is called sabotage, but it is
actually just a bit of tomfoolery used to get a computer to temporarily misbehave.
You will read about reverse social engineering later on.
Computer vandals frequently sabotage the in-formation stored on computers after
first using hacker's methods to gain entry to them. Vandals should not be confused
with hackers, however.
9
Neither should those folks who introduce incorrect or misleading data into a
computer system, or oth-erwise sabotage the data stored therein. An illus-tration
of such data tampering is given by Thomas Whiteside in his book Computer Capers
(Crowell, 1978). Between 1968 and 1972 the FBI planted false adverse information
on radicals and other people who had wild political views into the computers of
credit reporting agencies, "the idea being to harass those citizens by making it
difficult, if not im-possible, for them to obtain loans or other forms of credit." For all
we know various agencies may be continuing this practice. Want your own file
verified for accuracy? Hacker to the rescue!
Various Thieveries
Hardware theft is either the stealing of the ac-tual computer or its peripherals, but
it can also in-clude the piracy of a computer's internal design. It is related to
hacking in that stolen or "borrowed" hardware may be used to procure access
codes. In the case of design piracy, a hacker might clandes-tinely monitor the
private e-mail and other com-puter files of a hardware designer in an effort to steal
innovative ideas.
Software theft or piracy is the unauthorized copying of programs protected by
copyright. Often hackers will make personal copies of software they find on a
computer system, so they can learn how it was programmed and how it works. As
with hardware piracy, there is also the aspect of wanting to get an edge on a
competitor's new line of soft-ware, and so there is the hacking connection.
Information theft may include stolen credit card numbers" TRW reports, new
product specs, lab re-sults, patient or client data, or any other data that might be
potentially valuable. Electronic espionage occurs when that information is sold to a
third party, making the hacker a spy for either another country or company. In
both cases hacker tech-niques are used to steal the information, and pos-sibly even
to make contact with the spy agency in the first place.
The Seventh Crime
Finally, there is hacking. Hackers have the abil-ity to do any of the above, but they
choose not to. Read that again carefully, and see if you can detect the paradox. The
person who perpetrates the seventh of seven computer crimes - hacking - has just
been described as a person who chooses not to commit any crimes at all. Of course,

there is that small matter of illegally breaking into other people's computers before
that choice is made. But we conveniently disregard that because we don't see any
harm in the simple act of "breaking in." Where other computer crimes are
concerned, motivations are obvious. It is obvious why a person would steal a
computer, or engage in a financial crime, or a crime of vengeance. But with pure
hacking, essentially a peaceful, harmless act, motivations might not be as apparent.
The traditional motivation for a hacker was the quest for knowledge. But nowadays
that quest may be ruled by higher motives - like money. There are hackers who
see their talent not as a hobby, but as a trade. In fact, there are a number of both
moral and immoral reasons one would provide one's hacking services for a fee.
Before we get further into the How's of hacking, let's take a brief look at the Why's.
Hacker Motivations
The IRS has a bad reputation - and it deserves it. Sure, they pretend to play fair (I
have a friend who received a refund check from the IRS for one cent; so apparently
they can be honest at times), they pretend to do things in our interest, but under-
neath it all they do a lot of cheating, conniving things.
For instance, the IRS has a computer selection program called the Discriminate
Function System. DFS is a system used by the IRS to select over 80 percent of the
income tax returns which will'be audited. When the DFS selects a return for audit,
it is because the program believes there is a high probability the citizen made
improper deductions, or hasn't reported all income, or for some other rea-son
believes the filer has lied.
Now, as citizens of the United States, we are entitled to know all the laws and
regulations of our country, right? Not so, according to the IRS. The decision-
making formula (algorithm) used by the
10
DFS to select which returns will be audited is kept secret from us (so we can never
really know to what extent an action of ours breaks the IRS's re-turn-selection
laws).
It seems logical and fitting for the IRS to not re-veal this secret, because doing so
prevents a lot of fraud. But it also restricts our rights, and several years ago, two
outraged citizens sued the IRS to re-veal their selection formula. The citizens won
and the IRS was ordered to reveal the formula. The IRS was not ready to reveal
their secrets, and they ap-pealed their way up to the Supreme Court and still lost in
favor of the Freedom of Information Act.
But since the IRS is a crying, whining, wily baby, they refused to obey the court
orders, and ran to Congress for help. Congress, of course, immedi-ately enacted a
statute which made the IRS's audit selection algorithm immune to the Freedom of
In-formation Act.
Now, I ask you: Can you think of a better rea-son to hack than to get back at the
IRS? I'm sure that someday some hacker will surreptitiously stroll into the IRS's
computers and make off with their Discriminate Function System, and publicize it
widely for all to see and file by. <This has already happened in Australia. A
computer professional working for the Australian Taxation Commission wrote up a
guide to the confidential computer program which the commission used to
determine the legitimacy of a taxpayer's income tax form. Taxpayers could use his
guide to safely overstate the amount of deductions they claimed.>

Even if that doesn't happen, and even if that's not a hacker's main goal (which I
wouldn't expect it to be), there are plenty of motivations from which to choose.
Dissemination of information is always an hon-orable incentive to hack. According
to Tom Forester and Perry Morrison in their book on computer eth-ics (listed in the
bibliography), following the Cher-nobyl nuclear disaster, hackers in the Chaos Com-
puter Club "released more information to the pub-lic about developments than did
the West German government itself. All of this information was gained by illegal
break-ins carried out in govern-ment computer installations." Certainly that was a
noble and just act on their part, from our point of view.
Hackers also see themselves as preventers of disasters - computer disasters that is.
There have been several recent examples of computer security companies from all
over the world putting their se-curity products to the test. They did this by publi-
cizing a phone number hackers could call to try to beat the system. Sure this is
done for advertising hype, but it is also a good idea, and it gives hackers a chance
to do some computer cracking in a benign setting.
Hackers who maintain a high degree of virtue will use their illegal hacking to
prevent disasters. Once they have discovered (and misused) a secu-rity loophole in
a system, they will warn the system operator of that fact. Hackers are thus
beneficial to the world in that they act to keep the world in-formed and secured.
But we can only be assured of these traits if the hackers themselves conform to
ethical behavior. Unfortunately, due to the exciting/risky/devilish nature of
hacking, the people involved are often immature and play around in juvenile
activities such as vandalism and carding (mail ordering stuff on other people's
credit cards). These are the sorts of activities that True Hackers should strive NOT
to be associated with, as they degrade the word "hacker."
Many hackers, even some very good hackers, have done their part to give hacking a
bad name by having skewed motivations. There have been plenty of destructive
hackers, and those who just did not know when to quit.
There are also hackers-for-hire. Private citizens are willing to pay hackers to
change computerized information for them - grades, ratings, bills, access levels. Or
there are the people who want informa-tion about themselves deleted from the
record, be-cause they are in hiding. Private investigators can always use the skills
of the hacker to find addresses and phone numbers, credit ratings, and other pri-
vate concerns of clients and suspects which are con-tained on computers. Office
workers have hired hackers to scope out the personal electronic mail and files of
coworkers and competitors, to gain an edge when making a proposal or a bid.
There is not only industrial, but governmental espionage. All of the above has been
done and is being done RIGHT NOW, by hackers who hack for money.
Hackers tend to look down on other hackers who fall into this line of work. Maybe a
11
once-in-a-while job is okay, but to do it extensively and exclusively is to sell out
one's integrity.
I like to think that all people reading this book, and all hackers, will use their
talents to good ends: to promote public awareness, prevent tragedy, and to learn
new technologies and new innovations for one's own self-growth.
12
Chapter Two:
The History of Hacking

First Came Hardware
Where does one begin a history of hacking?
Do we start with the creation of the computer, by J. Presper Eckert and John
Mauchly? During World War 11 this pair of engineer and physicist approached the
US Army with a proposal for an electronic device that would speedily calculate
gunnery coordinates - a job that was then tedi-ously being done by hand. With the
government backing their way, the Electronic Numerical Inte-grator And Calculator
(ENIAC) was born in 1946. It was a year after the war's end - the machine's de-
signed function was now superfluous - but the dream behind its imagined future
uses lived on.
Of course, the origin of the computer - the computer for god's sake - the most
revolutionary invention since the telephone, can not be so easily summed up in a
tidy paragraph of wartime patri-otic stupor. The real story goes back further, to
Konrad Zuse, whose patent for a general-purpose electromechanical relay computer
in 1938 was turned down by the Patent Office as being not spe-
cific enough. It may have been ENIAC that spawned the next generation of
computers, but ENIAC was a one-task machine. Zuse's contraption had the feel of
modernity to it: a machine that would do... anything.
But is that where hacking began? Certainly not. The longing to do... anything has
been in the human psyche for ages. Perhaps we should begin with the
revolutionary creation of the telephone, culminat-mg with Alexander Graham Bell's
historic "acci-dent" on March 10, 1876. The telephone was not an immediate best
seller. After all, you couldn't simply buy one and place it in your house and use it.
Lines had to be installed. Networks had to be created to link home to home,
business to business, and fi-nally, state to neighboring state. Almost thirty years of
growth for the phone to spread throughout the country.
YIPL and TAP
So there was the telephone, there was the computer, and there was an undaunted
inquisitiveness in the collective human subconscious. It took an-
13
other war to shake that curious imagination loose onto the world, and on May Day,
1971, the Youth International Party Line became the newsletter of the fun-seeking,
disenfranchised riffraff of New York City's Greenwich Village. Abbie Hoffman and a
phone phreak who went by the handle Al Bell used YIPL to disburse information
about cracking the phone network. It was the first instance of subver-sive
information of its kind finding a wide audi-ence. Subscriptions to the journal spread
the word of this arm of the underground far away from Bleecker Street to people of
all walks of life. Today this distribution would be done by computer, and indeed, a
great deal of hacker/phreaker/anarchist material surfs around the world on the
invisible waves of cyberspace.
A few years after YIPL's inception, it became TAP - Technological Assistance
Program - when the goals of the phreaks collided with the more po-litically-minded
members of YIPL. TAP was more technical than partisan, and more suited for hack-
ers and their kin.
Computer Crime

The first recorded computer abuse, according to Donn B. Parker, a frequent writer
on computer crime, occurred in 1958. The first federally prose-cuted crime
identified specifically as a computer crime involved an alteration of bank records by
computer in Minneapolis in 1966. Computers were not so widespread then as they
are now, and the stakes weren't quite so high. It's one thing to have money
controlled and kept track of via computer; it's quite another to have power
controlled in this way. In 1970, many criminology researchers were stating that
the problem of computer crime was merely a result of a new technology and not a
topic worth a great deal of thought. Even in the mid-1970s, as crimes by computer
were becoming more frequent and more costly, the feeling was that the machines
themselves were just a part of the environment, and so they naturally would
become a component of crime in some instances. It doesn't matter if a burglar
carries his loot in a pillow case or a plastic bag - why should the props of the crime
determine the way in which criminologists think about the case?
This was an unfortunate mode of thought for those charged with preventing
computer crimes, because while research stagnated, the criminals, crackers and
hackers were actively racking their brains to come up with more ingenious methods
of doing things with computers they were not sup-posed to be able to do. The
criminologists could not have realized then that the computer really was an integral
part of the crime, and that the existence of these machines - and the systems built
around them - led to whole new areas of crime and think-ing about crime that had
never before been explored.
Lawmakers and enforcers, however, finally did sit up and take notice. In 1976 two
important de-velopments occurred. The FBI established a 4-week training course
for its agents in the investigation of computer crime (and followed it up with a
second course for other agencies in 1978). Also in 1976, Senator Abraham Ribicoff
and his U.S. Senate Gov-ernment Affairs Committee realized that something big
was going on, and it was important for the gov-ernment to get in on it. The
committee produced two research reports and Ribicoff introduced the first Federal
Systems Protection Act Bill in June, 1977. These reports eventually became the
Com-puter Fraud and Abuse Act of 1986. Florida, Michi-gan, Colorado, Rhode
Island, and Arizona were some of the first states to have computer crime leg-
islation, based on the Ribicoff bills that had devel-oped into the 1986 Act.
A year before, a major breakthrough was an-nounced at the Securicom Conference
in Cannes by a group of Swedish scientists who had invented a method of silently
eavesdropping on a computer screen from a far-off distance. But let's save this
story for later. Much later.
2600
Tom Edison and Cheshire Catalyst, two phone phreaks who had been interested in
the nether side of technology for ages, took over TAP in the late 70s. The journal
came to an end before its time in 1983 when Torn Edison's New Jersey
condominium burned to the ground, the victim of a professional burglary and an
amateurish arson. The burglars had gotten all of Tom's computer equipment, the
stuff from which TAP was born. The arson, perhaps
14
an attempt to cover the burglary, did not succeed. It was a sloppy fire, one which
Tom and Cheshire hypothesized had been engineered by some irate phone company

officer. A few months later, the original TAP printed its final issue. The following
year, in 1984, hacker Eric Corley (aka Emmanuel Goldstein) filled the void with a
new publication: 2600 Magazine. Ironically, Goldstein is more a rhetorician than a
hacker, and the magazine is less technical and more political (like the original
YIPL).
Networks were being formed all over, enabling hackers to not only hack more sites
but to exchange information among themselves quicker and more easily. Mo needs
published magazines? The City University of New York and Yale University joined
together as the first BITNET (Because It's Time NETwork) link in May 1981. Now
there are net-works of networks (such as Internet) connecting the globe, putting all
hackers and common folk in di-rect communication with one another.
WarGames and Phrack
A hacker named Bill Landreth was indicted for computer fraud in 1983, and
convicted in 1984 of entering such computer systems as GTE Tele-mail's electronic
mail network, and reading the NASA and Department of Defense correspondence
within. Naughty boy! His name will come up again. 1983 also saw the release of
WarGames, and all hell broke loose. Certainly there had been plenty of hacker ac-
tivity before the movie came out, but previous to WarGames those hackers were
few in number and less visible. The exciting story of David Lightman (played by
Matthew Broderick), a school-age whiz kid who nearly starts World War 111,
became the basis for many modems for Christmas presents that year. Suddenly
there was a proliferation of people on the hacking scene who were not really
hackers in expertise or spirit. Bulletin board systems flour-ished, and a large
number of boards catering to hackers, phreaks, warez dOOds (software pirates),
anarchists, and all manner of restless youth sprung up.
The online publication Phrack was founded on November 17, 1985, on the Metal
Shop Private BBS in St. Louis, Missouri, operated by Taran King and Knight
Lightning. The term "online" referred to the fact that this magazine was
distributed, not at newsstands and through the mails, but on the finews racks" of
electronic bulletin board systems, where collections of files are available for the tak-
ing. Later, when the journal's founders went off to college and received Internet
access, the publication was distributed through list servers which can automatically
e-mail hundreds of copies of the pub-lication throughout the world. Phrack is still
dis-tributed in this way. As the name implies, Phrack deals with PHReaking and
hACKing, but it also is pleased to present articles on any sort of mischief-making.
Annual conventions, hosted by Phrack, called SummerCons, are now held in St.
Louis.
Shadow Hawk
Bill Landreth, who had been arrested in 1983, was let out on parole and there are
reports of his mysterious disappearance following publication of his guide to
computer security called Out of the Inner Circle. He left a note stating that he
would cornmit suicide "sometime around my 22nd birthday..." There was much
discussion about all this. Was it a publicity stunt, or for real? Eventually Landreth
reappeared in Seattle, Washington, in July, 1987, and he was hastily carted back to
jail for breaking probation.
The month before - on the anniversary of D-Day - a cracker named Shadow Hawk
(also identified by some press reports as Shadow Hawk 1) had been discovered by
an AT&T security agent to be bragging on a Texas BBS called Phreak Class-2600

about how he had hacked AT&T's computer system. Shadow Hawk (really Herbert
Zinn of Chicago) was an 18-year-old high school drop-out when he was arrested.
He'd managed to get the FBI, the Secret Service, the Defense Criminal
Investigative Service and the Chicago U.S. attorney on his tail for not only the
above mentioned hack, but also for invading computers belonging to NATO and the
US Air Force, and stealing a bit over $1 million worth of software. Shadow Hawk's
case is important because in 1989 he became the first person to be prosecuted
under the Computer Fraud and Abuse Act of 1986.
Shadow Hawk is just one example of how this hobby has gotten people in trouble
with the law. Around this time there were a lot of hackers being brought down by
all manner of cops: security offi-
15
cers for the telephone companies and other organizations, the FBI, local police and
concerned citizens. This was the time when the investigators got smart. Not that
they suddenly knew more about computers and hacking, but now they understood
that to catch a lion, one must step into its den. These police agents started logging
onto hacker BBSs and amassed huge dossiers on the people who normally used
those boards. Many warnings were issued, and many arrests were made.
In August, 1986, Cliff Stoll first set out to find out why there was a 7,50 imbalance
in the computer accounts at the Lawrence Berkeley Laboratory in California. Stoll's
efforts led to the discovery of a group of German hackers who had broken into the
computer system. In October, 1989, a book about Stoll's exploits called The
Cuckoo's Egg was published and became an instant best seller.
Organized and independent hacker activity continued for the next few years with
little public interest. There were threats in early 1988 by the West Berlin Chaos
Computer Club that they would trigger Trojan horses they had implanted into
NASA's Space Physics Analysis Network, thus causing the chaos of their name. The
threats never materialized but minor havoc was wrought anyway, as many
computers were temporarily pulled from the net until the threat could be analyzed.
The end of 1988 - November 2, to be exact -marked the beginning of a new surge
in anti-hacker sentiment. It was then that Robert Morris Jr.'s com-puter worm
began its race through the Internet. Exploiting an undocumented bug in the
sendmail program and utilizing its own internal arsenal of tricks, the worm would
infiltrate a system and quickly eat up most or all of the system's process-ing
capabilities and memory space as it squiggled around from machine to machine, net
to net.
The Electronic Frontier Foundation
The birth of the Electronic Frontier Foundation was announced July 10, 1990. EFF
is a group dedi-cated to protecting our constitutional rights; it was created as a
response to a series of rude and unin-formed blunderings by the Secret Service in
the witch hunt known as Operation Sundevil. By May, 1989, this "hacker hunt" had
led 150 Secret Service agents to serve 28 search warrants in 14 cities. They seized
23,000 disks and 42 computers, often for in-appropriate reasons. E-mail was left
undelivered. Public postings never made it to the screens of the computer
community. Many innocent bystanders (as well as criminals) were arrested.
John Perry Barlow (author, retired cattle rancher, and a lyricist for the Grateful
Dead), and computer guru Mitch Kapor, best known for writ-ing Lotus 1-2-3, were
outraged by these events (and by their own run-ins with the FBI over stolen source

code that was being distributed by the NuPrometheus League). They teamed up
with attorney Harvey Silverglate who was known for taking on offbeat causes.
Some yellow journalism by the Washington Post provided the publicity needed to
attract Steve Wozniak (co-founder of Apple) and John Gilmore (of Sun
Microsystems) who offered monetary support for the enterprise.
It was at this point that the Steve Jackson inci-dent made the headlines. An
Austin, Texas, pub-lisher of role-playing games, Jackson's business was raided by
the Secret Service because one of his games, called GURPS Cyberpunk, had to do
with a kind of futuristic computer hacking. The Secret Service called Jackson's
game "a handbook for computer crime." This was ludicrous, akin to arrest-ing Milton
Bradley because they sell Chess, which teaches kids how to wage war.
Jackson's office equipment was confiscated, he was forced to lay off half his staff,
and he very nearly went into bankruptcy. "Eventually," Jackson later wrote, "we
got most of our property back (though some of it was damaged or destroyed). The
Secret Service admitted that we'd never been a tar-get of their investigation."
Jackson sued the U.S. government (the Secret Service, two of its agents, and a
Bellcore official were named in the suit) on charges that the Secret Service had
violated his right to free speech during the office raid. Justice prevailed and the SS
was held guilty. Jackson has, since made a role-playing game about the incident.
The summer of 1990 was filled with all sorts of similar surprises. There are the
famous stories, the infamous ones, and the ones that barely made the back page.
In the middle of August, thirteen New York young adults and minors were charged
with felonies involving computer tampering, computer trespassing, and theft of
services. They had broken into the Pentagon's computers, among others, and
16
got a whole load of law enforcers on their tail. $50,000 worth of computing
equipment was seized, said to have been used by the hackers to do the break-ins.
Dozens of stories like this were reported then quickly faded. Other tales and other
hackers held more interest, like Acid Phreak and Phiber Optik, who became
"celebrity hackers," speaking on behalf of the hacker community for various media.
Phiber Optik was eventually arrested and sentenced to thirty-five hours of
community service in'February, 1991.
And the Craig M. Neidorf story made head-lines. We have already mentioned
Neidorf (Knight Lightning) as one of the co-founders of Phrack. Nei-dorf published
an (edited) internal BellSouth paper in Phrack and was quickly charged with
interstate transport of stolen property, with a possible sen-tence of 60 years in jail
and $122,000 in fines. What was particularly absurd was that the document was
easily and legally available (though BellSouth declared it to be full of company
secrets), and it talked about the BellSouth bureaucracy as it per-tained to 911
lines. Sixty years in jail for copyright infringement?
The EFF helped Neidorf through these troubled times (as they'd helped Steve
Jackson, and would come to aid many hackers and crackers who'd been treated
unfairly or with ignorance by the law). The U.S. dropped its case against Neidorf at
the end of July, 1990.
There are dozens or hundreds of stories about hackers every year, and there have
been for quite some time. Some are quickly forgotten; others pro-voke
controversy. Such was the case on November 6,1992, when a group of hackers,
peacefully con-vening in the food court of the Pentagon City Mall outside
Washington, D.C., were bullied and man-handled by mall security personnel, Secret
Service and FBI agents.

Hacking has had a long past and will continue to enjoy a prosperous and successful
future because of people like us who enjoy seeing what secrets are out in the world,
waiting to be unearthed.
17
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18
Chapter Three:
Researching The Hack
Any serious hack will involve some prepara-tory research long before the hacker
sets foot near a computer. This is simply because to hack intelli-gently, one must
have knowledge of certain facts and ideas.
With computer hacking, you should obviously have some knowledge about
computers and telecommunications (ideas) but to actually carry out a hack requires
just one fact: a phone number. Or if not a phone number, at least one way of
accessing a computer. Either case requires some research. Once you've called the
computer for the first time, some on-line research is required to tell you how you
should proceed with the hack. And finally, there is the ongoing research you will do
once you've gained access to a system, to help you make full use of the facilities
you've conquered. The "after re-search" is discussed in the chapter "What To Do
When Inside." For now, let us discuss what to do to get started.
Targeting
By targeting, I'm referring to the process by which a hacker will decide which of all
possible computer installations to attempt to breach. This may seem like a trivial
topic for many reasons, but in fact it is a topic well worth discussing.
Let's suppose you are a rookie at this game. You have gotten - through research of
some kind, or just plain luck - a piece of information you feel will be helpful in
entering a specific system. For ex-ample, suppose you've discovered through the
computer crime grapevine the phone number of a large governmental espionage
database. Naturally, it seems reasonable to call the number and see if it actually is
what you've heard it to be. On the other hand, it might be better to first research
your target to see if it's worth the time and the risk, and the phone bill. Look up
the number in a criss-cross telephone directory for that region. Criss-cross di-
rectories., which are available at many libraries, are books (usually non-licensed by
the phone com-pany) which list the names and addresses that go with phone
numbers. Unlike regular phone books, criss-cross directories are sorted by number
rather than name. If you can't get this sort of directory, call the operator and ask
who the number belongs to. Naturally it is preferable to use a directory on
19
your own, eliminating extraneous interaction with phone company employees
("witnesses"). If the phone number is publicly available, it probably isn't a
computer line after all, let alone a secret one.
It may seem crazy to you to go out of your way to look up a number before dialing
it, but remem-ber, it is important to get as much information as you can about a

system before you make the first call. If it really is a top-secret database, it's
reason-able to assume that your call will be traced, or at the very least, will arouse
suspicion. As a novice one tends to get excited with one's first big break -and tends
to do stupid, dangerous things. You may not yet have the expertise to alter phone
company data, or call from a pay phone, or in some other way make it seem like
you are not the person placing the call. The rookie who calls a number of this kind
after doing a bit of research might be taking a stupid risk, but that's a few steps
higher on the professional hacker's scale than the one who calls without any
preparation at all. That's just be-ing stupid, period.
So, as far as targeting is concerned, you may not want to follow up that first big
lead right away. It may be preferable to wait awhile, until you have the expertise
to do it properly. If you know some-thing about a system no one else knows, it's
very likely going to remain a secret unless you spill the beans. If you try to act on
your inside knowledge and fail, you are ruining your chances of getting in later, as
the system managers might see their mis-takes and correct them.
My word of caution is this: Don't get in over your head. Get familiar with floating
on your back before trying to scuba dive for sunken treasure or else you may end
up being the one who's sunk.
Targeting also involves other research. What if you do have some exciting secret
that will let you get in somewhere? Perhaps you should think about the best way of
reaching that system in the first place. For instance, if the system you're stalking is
on the Internet, you would have to determine a way to access the Internet
disguised as someone else before you could proceed to your main goal.
If you are enrolled at a college, or live near one and have access to your own
Internet computer account, it is a trifling matter to log mi as yourself and, from
there, attempt to connect to other systems. It's not only trifling - it's dumb!
Regardless of whether you have mischief in mind, it's irresponsible and lazy to do
hacking logged in as yourself. Before you can move out of the few directories
allowed by your minimal access level, you will have to figure out a way to
disassociate yourself with what you do. That is - and I can't repeat it enough - you
will have to find a way to connect as somebody else, and through that connection
go on to bigger things.
Breaking into major league computer systems is very often a matter of, first,
personal hacking, and second, institutional hacking. That is, first you hack a person
(figure out a way of masquerading as that person), and then you hack the
institution (figure out a way of disguising that person as a legitimate user of the
protected system).
Time, money and effort can be spent needlessly on attempts to access systems that
ultimately turn out to be dead ends. Maybe your target is a school's computer,
because you want to change your grade from an F to A. You may think your target
individ-ual would be the dean or some other school head, but as it turns out, in
many instances you would be wrong. School heads often have little or no access to
the computers which hold grades, unless they themselves teach classes. In this
case you would want to target a professor or more likely, a teaching assistant
(T.A.). They're the ones who have to do the actual inputting of grades.
Consequently you would want to research the professor or T.A. to get a handle on
what their passwords might be.
Then there's the matter of the computer. Which computer should you target for
your hack? Teach-ers, especially in math and computer science courses, will
usually tell you their computer ad-dress so you can send them e-mail. But that
isn't necessarily where you need to go to change your grade. More likely there is

some hush-hush admin-istrative computer which carries out those func-tions, and it
is that computer you would want to hack.
It seems logical to assume that the president of a university has the highest level of
computer ac-cess. But does he or she really? Does the president actually have a
computer account AT ALL? You're probably better off targeting individual
professors. One English teacher I had mentioned Kojak a cou-ple times in class,
and on several occasions made references to things that could be interpreted as
having some relation to that television show (sometimes he would use phrases that
Kojak used
20
in the series). Obviously, Kojak is the place to start if one is interested in forcing
one's way into this guy's account (especially since he's an English pro-fessor, and
therefore less likely to understand the value of non-real-word passwords). And
trying Kojak-related words like "Telly Savalas," "lollipop," "bald," for passwords is
the obvious way of per-sonally targeting that English teacher's account.
But is he REALLY the one you want to use in the first place? If I had been failing
that class and wanted to get into his account to change my grade, Kojak wouldn't
have helped me; as far as I was ever able to determine, it was the teaching
assistants who had control over the grading, not the profes-sors! This is why it's
necessary to target in order to achieve your intended purposes. If you have goals
in mind, do the necessary research to find out if you are targeting the right PEOPLE,
as well as the right computers.
Potential targets can often be found by reading publicly available documents about
a site. Docu-ments pertaining to "ethical use" of the system, and articles
encouraging "preventative security" are often particularly enlightening. For
instance, here's a little quote I picked up from an outdated merno-randurn about
security policies. This is one sugges-tion taken from a list of what was felt to be
neces-sary improvements in security. By the time I read the article the
improvements had already taken place, but thoughts of needing security were long
gone from the minds of those who had written the memorandum, and so security
was lax. Here's the one suggestion from the list that stuck out:
Net 19 must be isolated completely by gateways from PCs and from the
broadband.
Terminal server logins must be strictly enforced on all machines. PCs should be
implemented
which will run software that will monitor the network for signs of misuse andlor
unethical usage.
Look at the goldmine of information that is given here. We have these suggestions
for improvement, so now it should be a simple task to determine which software
was purchased to implement the suggestions. From there we can see what the
soft-ware will and will not do, find out about bugs or loopholes, and use other
means to discover ways around that software. But most interesting of all (and the
point that is related to this discussion of targeting) is the mention of "Net 19." What
is Net 19? Obviously it is something that the administra-tion wants to go out of
their way to protect. Clearly it's something well worth hacking. If you had been
the hacker to first read these words, clearly Net 19 would be the target of your
hack.

Keep in mind that I read this document from a public terminal, without having to
log in as any-body. It was accessed from a public information system. It is
information available to anybody, and look at the wonderful clue it holds for all who
see it! Now, when I read this I didn't know what Net 19 was, but I knew
immediately to target all efforts to finding that system and penetrating its security.
This is an example of accidentally found knowl-edge being put to good use. But
don't forget - I was reading through every publicly available document for the SOLE
PURPOSE of breaking into the system. The specific bit of information I found was
accidental, but my finding it wasn't.
In a way, doing this kind of on-line research -exploring every inch of the system
available to you before going after the private regions - is a kind of targeting. If
your goal is a specific private computer system, target all public systems related to
it before you begin. This can only help you in the long run. It might lead to helpful
hints, such as the mention of Net 19, or it might at least familiarize you with
various aspects of the system.
Things you should be looking for when you target a public system in this way, with
the intent of going after a correlated private system, are: how it handles input and
output; if any bugs are present and how the system reacts to them; what the com-
mand format is (three letters? control sequence?) and what kinds of commands are
available; and machine specifications and hardware. Of course, there are numerous
other things you should either be looking for, or will unconsciously be picking up
anyway as you look around, like what the visual display is like and how long it takes
the computer to process commands. These are things that will be helpful later on,
because when you actually are trespassing, you won't want to spend hours trying to
find the help command or how to log off.
Targeting may seem not just trivial, but dis-tracting as well. After all, a scientist
can analyze a rainbow using specific technical terms that explain what a rainbow is,
how it is formed, and why it displays its colors as it does. But in a way, this
21
complicated description of a rainbow is completely unrelated to the rainbow being
described. The ex-planation ignores the beauty of it. The techno-jar-gon shuns the
poetic connotations that we associate with the rainbow we are so interested in
describing.
You may use similar arguments to complain that targeting and pre-thought and
planning of hacking attacks distract from the pleasure of the hack itself. If you are
a hired hacker you will need to get the job done if you expect to get paid. But
otherwise, why should we bother to discipline our-selves with such nonsense as
targeting? You're right! Certainly you're correct! There is no reason to feel
obligated to apply these suggestions that I pre-sent. There is no pressing need to
think carefully about what you do before you do it, but you should be aware of
these things as you start. At least, if you break the rules, you should understand
how following them might have helped.
Targeting specific computers that hold interest to you, and that you are sure hold
the information you seek, and targeting people who have specific access levels and
abilities - all of this is like ana-lyzing a rainbow and ending up with nothing but
gobbledygook. But in the long run, if you really want to end up at a position further
from where you started, if you want to hack for the enjoyment of it and maintain
high pleasure levels throughout the endeavor., I suggest you do these things. They
will help lessen the amount of frivolous searching and brute-force monotony needed
to get in, and will help you stay out of trouble. So, set up a gen-eral plan of action.

Make sure the goals you've out-lined are really the ones that apply to your case.
That way you'll know that what you are hackin won't turn out to be a series of blind
alleys.
I keep bringing up the point of "intentions," and it goals," but unless you're a
private investigator or some sort of muckraker, you're probably willing and happy to
break into any computer available any and all opportunities that present
themselves. This is fine too, and many hackers are so devoted (fanatical?) in their
pursuits that even if they know a computer system will offer them nothing exciting
once they get inside, they persevere because it is the thrill of the break-in itself
that drives them.
But as you can well imagine, it is much more in-teresting to break into a system
that holds secrets, than one whose contents are worthless to you. Is it worth it to
spend months trying to get into a system that contains statistics on the copulation
pat-terns of lab rats? (Not unless you happen to have an interest in that sort of
thing.) Choose your targets carefully. Getting into the system is half the fun; once
you're inside, the other half can be more exciting.
Collecting Information
Before you begin researching you should know what kind of information you should
be trying to find out. There are three topics a hacker should be concerned with:
Telecommunications in general, computer systems in general, and specific systems.
There is a certain level of understanding you should have about computers,
modems the tele-phone and human nature. Hopefully this"book will prepare you
with most of the information in these categories that you will make use of. If not -
and I readily admit this is not an all inclusive Bible of the Universe - then go around
to some local or special libraries and find out what you need to know.
Maybe there isn't anything you specifically need to know. You will still want to keep
up with the latest developments in technology as well as the organizations who run
the computers you intend to hack. Even if you think you know everything there is
to know, it can be most helpful to do a bit of reading to make sure you really are an
expert in your field, especially when dealing with such rap-idly changing fields as
computer hardware, soft-ware and telecommunications
So go to your local library. Go to the shelves with the computer books, and the
shelves with the criminal justice books, and the shelves with the business
management books. That's where you'll find the "legit" books about hacking and
computer crime. Every once in a while, take out some books on
telecommunications and look through them. You want to start getting familiar with
the various situations you'll be encountering, so look through books on the different
information services, on-line databases, computer crime, operating systems, BBSs,
and anything else that pertains to what you can do with a computer and a modern.
Look up "telecommunications" in the card catalog. Also, security," "computers,"
"hacking," "telephones," modems," and anything else you can think of that's
relevant. Also, remember to look through the
22
books in the reference section; you will find the most useful materials there.
Hacking is best learned by doing, but many good tricks and leads can be found in
the literature.
By the way, do you know who the biggest book publisher in the world is? The
United States government. If your library is a government depository, read through

all the relevant government publications that interest you. You'll learn a lot from
that stuff.
I'm not saying you should read every book in the library, and I'm certainly not
saying you should read all this before you begin your hacking ex-ploits. What I am
saying is that very often people don't realize the wealth of information that is avail-
able to them free for the asking - no need to hack. And by reading these things
you will get familiar with what different computer systems look like when you log
onto them. You will get to know the kinds of commands that are available to you,
and what formats the systems use for names and pass-words. Also, you will often
find toll free numbers listed in these books - lines you can call to test out various
systems, or to get information on the sys-tems. All this information will be helpful
to you as
you proceed.
While you're at the library go to the periodicals section and take out some computer
magazines and newspapers. Borrow some that you don't normally read, or that
you've never heard of before. It is use-ful to write away for information from the
maga-zines, and to send in the Reader Service postcards to get free information.
It's amazing what compa-nies will send you, and it's further amazing to think about
all the great tips this information offers to the hacker. I'm now on several
perpetual mailing lists from various computer security companies. I know
everything I need to know about all their products, their upgrades, what businesses
use their software - and from that information, I can hack my way around their
products. Knowing how they go about catching hackers, I know how to avoid
getting caught.
Another, sometimes more practical way to use the library is to find out about
donated books. Many libraries get donations of books, either for an annual book
sale or for their shelves. A lot of those books are old technical and company
manuals for computers, software, and operating system proce-dures. The librarians
who deal with donated materials will probably look at this sort of thing and throw it
out as useless. If you make friends with them, surely they would prefer giving such
11useless" items to you, rather than discarding them. I've gotten many valuable
guidebooks, reference guides, operating systems manuals, and disks this way. I
even have a very nice and very current set of AT&T security books.
Sometimes the books you pick up have notes scribbled in the margins or on the
cover. My favor-ite note was the one that gave a phone number and group ID
access code. The access code had since been deleted, but the phone number still
worked and so did the sample visitor's password listed in that manual.
Some Unusual Research Methods
They aren't really all that unusual, because after all, anything that works - works!
Any time you get an idea for a new way of discovering more about an online system
or the people who run it you should do your best to act on that idea. In the long
run every bit of data is potentially useful. Anything you manage to find will either
help you get in your present target computer, or get in an-other one some time in
the future.
Besides, it's always a delight to find confidential data or insider secrets about a
system. Share that knowledge with other hackers and you will be re-warded with
interesting tips that will be beneficial to you.
Here are five further research methods: online computer simulators and tutorials;
sorting through trash; found disk analysis; examining screenshots; and snooping.
Remember - these research meth-ods work. Use them to your advantage.

Online Computer Simulators And Tutorials
Computer-based simulators and tutorials are often employed in teaching the ways
of the com-pany computer system. These programs mimic the computer screens
users would see if they were to log in to the actual network. Tutorials and simula-
tors differ from the actual network in that they talk the user through a typical use
of the system, per-
23
haps showing off special features available to the user. If the user isn't given a
guided tour, there is often a workbook that is to be used with a scaled-down version
of the actual system, often one with extensive help facilities to teach the new user
the ropes.
Tutorials and simulators give new users hands-on experience with the problems and
poli-cies of software they will encounter. They are very often used for training
purposes instead of the ac-tual system, or as a supplement to it. There are sev-
eral reasons for this. What if the system is still be-ing installed " or undergoing a
renovation? Or per-haps not enough terminals are connected yet for all employees
to access the actual system. Using simulators eliminates these problems since they
can be set up on any computer.
Temporary employment agencies may use software from a specific company to
pretrain their workers, especially if the agency gets a lot of jobs from a specific
company. Or regular employees may want the convenience of being able to borrow
a tutorial disk from the company library to practice on at home. Finally, a good
tutorial program or simulation can ensure that everyone receives the same quality
instructions, without leaving out im-portant details which a human instructor might
forget to teach.
How to get them? Simulation programs may be available from corporate, special or
even academic libraries. You may also get hold of one from the publisher. Write to
a software publisher,' saying you're interested in making a large purchase and ask if
a demonstration disk is available. And you may be able to procure one from a
friendly member of the company's computer department (do some social
engineeringi - pretend you're a company manager or supervisor).
Simulators and tutorials are great things for a hacker to come across; the
usefulness of them should be self-evident. They will help you learn the systems,
and perhaps reveal default entry-words, and might even come with descriptions of
system bugs.
Social engineering is the act of talking to a system user, pretending that you are
also a legal user of the system, and in the course of the conversation, manipulating
the discussion so that the user reveals passwords or other good stuff.
Sometimes you have to use your imagination to find other ways in which online
simulators can help. I was waiting in an office one day to see someone. The
receptionist stepped out for a mo-ment and I stepped behind her desk and
borrowed a computer disk I'd noticed stuck in a book. e disk held a program called
ARRSIM (ARRangement SIMulator) which was actually a copy of a program they
used on-line, only with a minuscule database of names. The program was used to
teach employees how to use the computers to arrange and schedule meetings
between custom-ers and potential contractors.
When I got home I booted it up and started playing around. At one point I tried
changing an address and the computer responded, "Supervisor Approval Required"

and put a cursor on the screen. Apparently it wanted a password. I tried the one
that was used to log into the simulator (which was scribbled on the disk label) but
that didn't work. I scanned through the disk with a file maintenance utility, but
could find no text (i.e., hidden pass-word) that I had not already seen.
Now, it occurred to me that address changes were probably something that
everyone had to do every once in a while. So why had it asked for a password
when I tried to change an address? Ob-viously the program had been designed by
your usual paranoid manager who did not trust a recep-tionist to change a name or
address by herself.
So I called my favorite receptionist at the com-pany, and after some suave insider
gossip about company matters ("So Sheila's a grandma! Was it a boy or a girl?" I
had heard her discussing this with a coworker the day I was there), I popped the
question: "Gaye, do you know what to type when it says 'Supervisor App'- "
"Oh isn't that silly!" she laughed. "It's really horrible. Type 'morris.' I don't know
why they have that there. Nobody's supposed to know about it but we use it every
day!" I thanked her and - you know what? -'morris' didn't work as a password on
the simulator (I don't think anything did). But it was the password used to get into
the actual net-work. Apparently only supervisors were supposed to be able to log
on the terminals scattered throughout the offices.
24
Sorting Through Trash
It isn't really a dirty job, and nobody has got to do it, but serious investigators will.
By "investigators" I refer to hackers who are research-ing a company or computer.
It really isn't all that messy going through the garbage of most places. Often you'll
find a separate bin for white paper. Some may be shredded, but mostly not. Try to
plan your trips to the trash on days following a few days of sunny weather. You
want your garbage to be in tip-top shape.
While I'm inside the dumpster I like to make stacks of the papers I find and load
them into garbage bags. Then I bring it home to examine what I've collected. You'll
find internal phone directories, names of public and private individuals, training
manuals, outdated files, letters, information about projects being worked on, and
sometimes even mention of the computer system. Much of it is help-ful, and most
is interesting too.
Even the regular trash is usually a pretty clean place to be (somewhat).
Rummaging around in the garbage bins of various companies, office centers and
other institutions, I have come across: micro-fiche, computer cards, entire boxes of
business cards, books, a dead cat (really gross), broken elec-tronic junk, and lots
and lots of, well, garbage. Of course most of it isn't helpful for the hack, but often
there is knowledge to be gained. You can find out a lot about how an organization
functions by its trash, and the way in which that trash is organized.
The first time I did this, I took a single green trash bag from the bin behind a bank.
Bank bags, by the way, are stapled shut with a paper receipt that tells the name of
the bank, and the time and date of disposal of the bag. The trash within is of two
types. There are smaller bags containing refuse from each individual's office in the
bank, and then there is the cytoplasm of crumpled forms and dis-carded paper
tapes from behind the counter. The interesting parts are the bags from individual
of-fices. In my first garbage heist, one banker was Japanese - he was throwing out
a Japanese newspaper and a Japanese candy wrapper in addition to his bank-
related stuff. There was also the womanon the diet, the struggling-to-make-ends-

meet single mother, and the assistant bank director. Now the bank director her
garbage was very interesting. It contained a discarded lock from the vault, a box of
orange "key hole signals (style V)," some vault-key envelopes, a slip of paper with
the combination to a safe scrawled across it like a clue in a parlor mystery (12R-
32L-14R in case you care), and a memorandum to "Branch Managers" from the
woman in charge of "Branch Automation," which apparently had accompanied a
disk. From that let-ter I was able to get the name, address, and room number of
the bank's Branch Automation Depart-ment and from there evolved a social
engineer through the mails (see chapter on Social Engineer-ing) which resulted in
myself getting a copy of the disk in question as well as some other very useful
information.
If you were caught hacking a trash bin, you used to be able to say that you were
"just looking for cans to recycle." Now offices pre" much recy-cle everything, so that
won't do for an excuse. The old "school" or "community project" ploy is always a
good bet: Say you are rummaging around in there doing research for a report on
government or busi-ness waste.
Before you even step out of your house the first time, do a bit of phone work to find
out what the garbage situation will be like. Call up the Solid Vyaste Department
and ask when garbage collec-tion is for the street you have in mind to plunder. If
pickup is Monday morning, that's good, since you'll be able to go at night over the
weekend, when no one is around. You don't want to end up going the day after
collection, so make that call be-fore you hop in your car.
As for recycled white paper, if there aren't any outside bins devoted specifically to
it, you might want to go to the office during the day ( if it has a publicly-accessible
area ) and take a casual look at the level of white paper in the recycling cans inside.
Do this at different times of day for a few days, and you'll get their recycling
schedule. Again, you'll want to nab white office paper when the bins are'at their
fullest.
GIRK
Of course, you can go out scavenging unarmed through the trash bins of the world,
but to facilitate and quicken results, you will most likely want to
25

FIG 1
A memo retreived from the garbage contains valuable information
26
prepare beforehand for your excursion into the trash of white collar America!
Here are the things you should consider includ-ing in your GIRK - Garbaged
Information Retrieval Kit:
Rubber gloves. Either surgical gloves, or the kind you use while washing dishes.
Though most garbage you'll be rummaging through is "clean" (white paper bins for
recycling) it's a good idea to wear some sort of thin gloves anyway. You'll also want
to wear gloves when you're at home sorting through the bags you lifted.

Ladder. I'm not talking about real ladders here, al-though you may want to use
one. Some dump-sters are very high, or are vertically-oriented, and so climbing
out of them may be difficult. Find yourself an old chair or hassock some-body's
throwing away, and take it in the trunk of your car. Then you can either put it into
the bin from outside if it looks like you'll have trouble climbing out, or you can use
it to climb into the bin in the first place. Either way, if you have to leave in a hurry
for some reason you can safely leave it behind - after all, it was garbage to begin
with, right?
Flashlight. Take a piece of rope or a strip of denim or something and fashion a
strap. Make the strap just big enough so you can easily slip the flashlight on and
off your hand. Especially if you'll be rummaging at night, you will need a powerful
flashlight to guide you through the garbage. Make sure the batteries are okay -best
thing is to use rechargeables.
Garbage bags. Not the clear kind. You must use black, brown, or similarly colored
bags for this. After all, you don't want people to see what you've got in them. If
you're just pulling manuals, memos, etc., out of the trash and are not bringing
home whole, intact bags, you should bring along at least one of your own dark-
colored garbage bags, to put everything in. You might want to take two bags,
placing one inside the other, to insure against breakage.
Appropriate clothing. Don't go rummaging through garbage bins in your Sunday
finery! Wear shoes you'll be able to climb and jump with. Wear clothes that won't
snag, old clothes, clothes that you don't care if they get destroyed.
You might want to wear a custodial type outfit, if you have it. If you know the
company maintenance staff tends to wear baseball caps, or a certain color shirt or
jacket, then by all means dress similarly. Wear dark colors, not bright pinks, reds,
or yellows that everyone's going to be staring at.
Empty soda cans. Some hackers tell security guards or other onlookers that they're
searching for aluminum cans to recycle. You might want to fill up the bottom third
of one of your garbage bags with cans, or maybe leave an open bag of cans outside
the bin so bypassers will be able to figure out for themselves that you're collecting
cans for charity.
One time I told a stodgy old guard, "The sci-ence classes at my school are
competing to see how many cans we can recycle. For every pound of cans we bring
in, our school gets three dollars. The class that brings in the most cans wins a
prize. Right now we're in second place, so I want to bring us up to first!" He walked
away and came back with a handful of empty beer cans and bottles. "Are you doing
glass too?" he asked.
Remember: don't carry unnecessary things in your pockets, or things like watches
that are going to fall off your wrist. You don't want to lose money, wallets, credit
cards, notebooks or anything else to the hungry stomach of a garbage bin, so leave
all that at home. Before you leave the house, do a pocket check. Make sure you
have nothing that could identify you and nothing you can't afford to lose. This
seems like obvious advice but I can recall at least four different messages posted by
hackers on private BBSs where they said things like, "Jeez! I just came back from
the CornpuPhone dump and I forgot to put my ring back on after I climbed out of
the can! Now I'll have to go back there tomorrow!"
On the other hand, you might want to take along a cheap watch or something that
didn't cost' much but looks expensive. Then if some curious person comes along
you can jump up and say, "Here's that stupid watch! I knew that idiot janitor threw
it out with the trash!" Also, another good idea: Take a shower when you get home!
27

Found Disk Analysis
When you hack you begin to find disks every-where. Some have been discarded,
mangled, warped, bent; some have been carelessly lost, in the drive of a public
computer, under a keyboard, be-hind a desk; and others you will find in their natu-
ral place - lying around on people's desks, in disk boxes, in library reference books,
in file cabinets. You will want to be able to read data files off these disks and rerun
any programs on them.
I am not going to suggest that you actively steal disks that you find in an office or
wherever, but if you can manage to sneak one away for a few days or overnight
without it being missed, then the best of luck to you!
Before I go into what should be done with found disks, let's get our terminology
straight. Here I will be talking about microcomputer disks, which come in two
varieties: 5 1/4" and 3 1/2" disks. A disk is composed of two parts. There is the
square plastic outside, which I will refer to as the envelope, and the circular mylar
disk inside. The square envelope is simply a means of protecting the flimsy and
fragile disk within, and can be horribly mutilated without damaging data on the disk
itself. 31h" disks have a small plastic or metal door that slides open to reveal the
disk inside. 51/4" disks are unprotected in this way; their disks are exposed
through an oval hole.
WARNING!
••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
Never put a disk of unknown origin, especially a physically damaged one, into a
good disk drive. Before examining found or damaged disks, you should get ahold of
a cheap, second-hand drive and use that for found disk analysis.
Examining bad disks can easily damage your disk drive. Never use bad, damaged or
found disks on a good quality drive!
Check Up
Begin a found disk analysis by removing the disk from its paper sleeve if there is
one, and eye-balling both sides for any distinct problems such as grooves, coffee
stains or wrinkles. It is amazing what disasters disks can live through. During the
early '80s when home computers first hit the mar-ketplace, there were warnings
everywhere: "Don't put disks by magnets, by your monitor, on your printer, or near
your telephone. Don't bend disks, don't let your fingers stray from the label..." And
on and on. Certainly you should treat disks carefully, but as we've learned since
floppy drives became in-expensive enough for anyone to afford, disks just aren't as
fragile as they were once thought to be. And certainly the plastic and Teflon they
are made of are cheap enough to throw away, meaning dis-cards are common. So
if you are rummaging through a company's trash bin and you see a man-gled disk,
take it - you might be able to get some-thing interesting off it.
If there is nothing visibly wrong with the ( 5 1/4" ) disk, but you're still wary
(because you found it in a garbage can or in a dusty place or something) you should
carefully hold the envelope with one hand while rotating the disk with the other
hand (using the hub ring). Look at the disk through the oval window as you do the

rotation. Then turn the disk over and inspect the other side the same way. For 3
1/2" disks, you will have to hold open the sliding door with a finger as you rotate
the disk using the hub ring.
If you suspect that a 5 1/4" disk is filthy, or if there is any dirt at all inside, rotating
the disk may scratch it. Instead of rotating it, do this: Push the disk to the bottom
of the envelope with your finger. Take a pair of sharp scissors or a knife and cut off
a very thin strip of plastic from the top (label) edge of the envelope. With thumb
and fingers, puff out the envelope, and ease out the disk. Don't wipe dirt off the
disk - you don't want to scratch it. Try to blow away dust and dirt, or use a hair
dryer set on low heat, or a can of compressed air.
Now look inside the plastic envelope. You will see a lining of a white gauze-like
material. If that's dirty, throw away the envelope. Take a different disk ( that
contains data you don't need any more ), slit the envelope open the same way,
remove the disk and replace it with the other round floppy. Make sure the
reinforced hub ring ( if it has one ) faces front. Now you can try using this disk on
your cheap second-hand disk drive.
28
For 31/2" disks, you can first carefully remove the door, then gently pry open the
plastic envelope case with a knife. Don't jam the knife into the envelope; rather
work around the edges and comers where the two halves are snapped together.
Re-move the floppy disk. Blow away any dirt, then put the disk into a clean
envelope, using tape to keep the pieces together. Replace the sliding door if you
can, but don't worry about that aspect if you have trouble doing so - most drives
will not miss it.
51/4" disks sometimes get folded or bent. They are still usable but the bending can
misalign your drive head. Not only will this ruin your disk drive, but subsequent
disks inserted may be irreversibly damaged. Therefore, never use bent disks on a
good drive, or good disks in your bad drive.
If you find a bent disk in the trash, first flatten it out as best you can. Put it on a
hard, smooth, flat surface. Cover it with a few sheets of paper, then take a heavy
book and press it down. Do NOT try to straighten disks by bending them the other
way. If the outside envelope still seems in pretty bad shape, remove the inner disk
and insert it in a good, flat envelope as described earlier.
Let's look at some of other ways a disk can be damaged but still remain
salvageable.
Damage To One Side
If the damage to a disk is limited to a single side, you will still be able to read
data from the
other side. There are two ways to do it.
The first way is to use a superzap program to selectively read tracks, piecing
together data as you find it. Superzap programs, such as DOS's DEBUG utility,
allow you to alter the data on a disk one bit at a time. If you can get your hands on
an old single-sided drive it will make your work a bit

Figure 2
Don't try this with your store bought disks! After slicing open the top, apply
pressure
to the sides (A). Then (B) slide out the disk.
Now you can repair the disk,clean it, and slide it into afresh envelope
29
easier: simply insert the disk bad-side-up, and read away. (In single-sided disks,
data is normally read from and written to the back of the disk - the underside, if
you hold the disk label-side up.)
A second option is to use a cosmetic disguise to hide the damaged side of the disk.
For example, suppose you have found a 51/4" disk with unremov-able blemishes on
one side only and your drive simply refuses to read the disk. Here's what you do.
Take another 51/4" disk, format it, then cut it open. Remove it from its envelope,
and tape the new disk over the blemished disk. The tape should be between the
two disks (thin double-sided tape works best). Make sure you line up the two disks
precisely. Insert the taped disks back into a clean envelope, and see what you can
make happen!
Rips And Tears

You can very carefully tape a ripped disk back together with thin transparent tape.
Make sure to only put tape on one side at a time. Once you've gotten all the data
you can off one side, you can remove the tape and repair the other side. As be-
fore, it is imperative that you don't let the tape get onto the side of the disk which
the drive will be reading, or you could throw off your drive's read/write head, and
may get sticky stuff on it, too.
Imperfections
If a disk looks okay, but will only give you "Read Errors," it is probably physically
damaged on a microscopic level. It may have little holes or dents in it,
imperfections that are too small for the naked eye to see. You can push past bad
spots on a disk by manually rotating the disk inside. If the damage is limited to a
small area of the disk, it may be that the damaged segment is the part the drive
tries to read first. If you manually rotate the disk a little to the left or right, the
new section of disk which you reveal may not have that damage and may there-fore
be readable. Keep rotating the disk, a little at a time, until you've found a spot that
is readable.
If you never find a readable spot, perhaps you've been duped! Maybe the disk is
blank, or it isn't suitable for your computer. Or maybe it's single sided and you've
inserted it with the wrong side facing the drive's read/write head.
A disk that you find in the trash bin may hold corporate data, proprietary software,
maybe even a tutorial or simulation like we discussed earlier.
You never knew there was an archaeology side to computer hacking, did you? But
that's exactly what all of this is; we are looking into people's lives to see what they
think about, to find out what's im-portant to them, and to learn from their experi-
ences. Hacking a damaged disk that you have un-earthed from a trash bin will lead
you to details you would otherwise never have imagined existed. I highly
recommend the exercise for the thrill value, and for the intellectual workout to be
gained from this pursuit.
Examining Screenshots
The photographs of computers you see in books, magazines, system
documentation, promotional literature such as posters and pamphlets, government
publications and booklets, as well as the pictures of computers available on
television documentaries, news shows and commercials -can all contain valuable
hacking information.
Computer photos might show just the screen (or monitor), or the entire computer,
including keyboard, CPU and accessories. Or the picture might depict an actual
computer in its natural envi-ronment with perhaps an operator visible.
The first group, essentially "screenshots," can be helpful in showing you what it
looks like to be in-side a particular system that you have never really accessed.
This can clue you in on what accessing style the system uses, if the password is
displayed on-screen as it is typed, username and password styles, what features
are available, and much more, depending on what the photographs are attempt-ing
to illustrate. Similarly, in user manuals and other instructional aids, drawings of
screens are often found containing the same information, also default login codes,
text specifics, error messages, and other handy stuff.
Knowing error messages and knowing the lay-out of the screen will make you a
more believable system administrator or low-level user when you attempt some of

the social engineering tricks men-tioned later in this book, especially if the
computer system in question is one that is closed to outsiders. Seeing examples of
logins will give you ideas on
30
how to go about a brute force attack. If a user name is shown or illustrated, it may
be a valid one. Even if lower down on the screen all you get for pass-word
information is a row of asterisks ("password:
it will still help you in determining the length passwords are required to be. If in
separate photos taken from separate sources, both pass-words are shown being
covered by eight asterisks, that is a good indication that either there is a de-fault
eight-character password used to demonstrate the system, or that passwords are a
maximum length of eight-characters.
Style of usernarne is important too, and will usually be visible. Seeing examples of
usernarnes lets you know if first and last names are required, if uppercase letters
are needed, whether abbrevia-tions or company names or group names are used for
usemames.
Photographs that include more than just the screen often show the keyboard being
used (look for misplaced or special keys), keyboard overlays, the kind of computer
setup, and possibly messages taped to the CPU or monitor. A more generalized
shot may show the computer's surroundings. Is it in a closed office, or are many
terminal operators working together in close proximity? What books are there on
the shelves? You may be able to see things of interest hanging on a wall, or lying
around on the desk. A user might be in the picture; is he or she wearing a name
tag? Are pictures of a family present, or items suggesting a hobby, such as a
mounted baseball or a fishing rod? All avail-able data can be put to use by a
hacker.
When I refer to the computing environment, I am, of course, only referring to
pictures of comput-ers in their natural environments, as opposed to staged photos
in advertisements, like the kind showing a Macintosh in your typical teenager's
room. Newspaper and magazine articles are often accompanied by the kind of
computer photo you will want to analyze.
Seeing these things - signs of family life, books and hobbies, a typical user and
what he or she is wearing - gives clues to passwords. The specific kind of computer
may suggest ways of breaking in using known bugs or loopholes. The computing
environment also will allow the social engineer to pretend familiarity with an
otherwise private room or office inside a building.
An additional way computer photographs can help is by looking to the bottom,
usually in the caption, to where the source of the photo is listed. The source may
give a photographer's name, in which case that photographer may be discreetly
pumped for information, or it may give clues as to a relevant city, business or
organization. This can help in determining phone numbers, means of ac-cess, and
also passwords.
These are just some of the ways in which close magnifying glass work will help you
find out more about your intended target system. You can see why it is a good idea
to videotape as many corn-puter-related TV shows as you can; you can always fast-
forward through the boring parts. Freeze framing a specific scene may help give
insight into the hidden side of a system and the people who run it.
If you get a lot of static on your television when you freeze a frame, try cleaning
the VCR. If that doesn't clear up the problem, it may be the audio component of
the tape that is interfering with the video picture. Try taping just the video part of

the tape you want to freeze. One way to do this is to connect two VCRs together
using just the Video In/Video Out cable, ignoring the audio link. Copy the relevant
portion of the tape, and you will have a picture without accompanying sound to
muddy the screen.
You should only have an audio problem like this if there's a lot of background sound
to begin with, like loud narration or loud music going on.
Here's an example of how this kind of photo-graphic detective work pays off:
A hacker named Bellee was watching a behind-the-scenes-at-the-police-station
show on her local cable channel. A close-up on a computer screen re-vealed the
last three digits of a phone number that was being dialed by modem. The rest of
the num-ber was invisible due to glare on the screen. Bellee knew the police
databank being called was head-quartered in a specific town in Maryland, because
the officer giving the tour had mentioned it. Some of the access codes being typed
to get into the da-tabank were easily visible or inferable by all who watched the
show, but some weren't. A bit of h-brary research got Bellee the three-digit
exchanges that were local to the township the cop had men-tioned. Bellee then
dialed each of those exchanges until she found the correct phone number. (Because
31
she had the last three digits from the television Just seeing the computers can be a
boon, and show, she only had to call each exchange 10 times to fill in the missing
digit.)
Once she got through, she was able to use the login information she knew (a
precinct number, municipality and state were needed) and hack the part she didn't
(she knew she needed an eight-letter password from the TV show). So watching
televi-sion paid off for Bellee.
Even widely syndicated shows can mess up by inadvertently revealing important
clues to an observant audience. Anyone who happened to be watching a certain
episode of Geraldo Rivera's Now It Can Be Told news show in late 1991 would have
seen a story on a group of hackers and how they broke into a military computer.
Several times dur-ing the course of the story the camera came close to the
computer's screen, where the electronic address of the computer they had hacked
was visible. The story also reported that the hackers had added an account to the
system under the name "dquayle," with no password. As you can imagine, soon
after the segment aired the account was closed up. As of this writing there is
definitely no "dquayle" account on the system (I just called and checked), and some
of the more common ways of gaining access to the system have been noticeably
shut down. For ex-ample, it is no longer possible to call up anony-mously and
retrieve files from that system.
Snooping
You can go on tours of a lot of places, either of-ficially or unofficially. A tour might
be one that is regularly run for wide-eyed kiddies and their par-ents, or it may be
one specially set up for you be-cause you say you are a journalist who wants to do
an article on the company. While taking your tour you will be gleaning valuable
information about the computer rooms, and about the person conducting the tour.
That's all good information that can be put to use in guessing passwords. If you're
suave enough, you can talk a proud com-puter owner into showing off the power of
his ma-chine or the new game he's gotten. This can only help you when you go
home that night and hack the place.

seeing the screen setup is helpful as I've outlined above.
Now here's a hint I like to make use of, though I get to do so only irregularly. We
are all familiar with the phenomenon of phosphorus burnout. That is, when one
image is displayed for an extended period of time, the image gets burnt into the
screen. Very often menus get burnt into the screen, and so occasionally I've been
in places where there is an old terminal that used to be for employees only, but has
been moved into a publicly accessible spot. Many of the functions available for staff
use only are visible on the screen and can be put to use or hacked. (You might have
to fiddle with the bright-ness controls to see what it all says.) Other times I've
snuck a peek at the computer behind the counter, and although an innocuous
screen was being displayed at the time, there was worthwhile stuff barely visible,
burnt into the screen.
Many businesses, institutes and organizations run what are called special libraries.
These gener-ally concern themselves only with the product or service which is the
group's field of interest, but also include valuable details on the group itself. For
instance, a company library might have manuals in it to the company's unique
computer system. Often there is a helpful listing of what programs are available on
the mainframes. Such a program list-ing might include mention of what security
prod-ucts are enabled, and you can write to the maker of those security products
for details.
Snooping around buildings undergoing recon-struction can be worthwhile, as can
snooping around buildings whose occupants are moving to a new building.
In such cases, doors are found wide open, with computers and manuals laying
around all over the place.
I remember one building I went to that was temporarily vacated due to
construction, which had tons of cartons, desks and workstations out in the corridors
(they were repainting offices). I found masses of passwords stuck to keyboards by
Post-It Notes, and passwords scribbled on desk blotters, and taped to the underside
of drawers. It was amazing that people could leave their secrets lay-ing out in the
open like that, and yet it happens all the time.
From snooping around the lounge in a school building, I came up with handy
reference manuals,

Figure 3
Secret information that must be used every day (such as access codes) is
oftenfound hiding on little scraps of paper:(A) on a cork board, (B) attached to the
side or top of the monitor, (C) on nearbyfile cabinets or other furniture,(D) under
blotter, (E) under mouse pad, (F) in desk drawer, or (G) underneath the the desk.
decade-old literature from a defunct computer users group, programmers' guides,
and other stuff. This wasn't all necessarily useful for hacking pur-poses, but it was
interesting to read. And it was in-teresting to rescue it from its dusty box on the
top shelf of a closet.
In that same building I found a little room whose door was closed and had four
signs attached to it. The first, formal and engraved said, "Computer Room." The
rest were menacing, either hand lettered or printed by computer: "Keep this door
locked at all times!" "For authorized persons ONLY!" And lastly, another stem
reminder, "ALWAYS lock this door when you leave!" Needless to say, the door was
unlocked.
Inside there was a huge and informative operating system reference manual and
two PCs, each of
which had modems. From surfing the hard disks on one of those computers, I
found that the termi-nal program was set up with script files <A "script" is a file
that you use with a terminal program. You set up the terminal program so that
when you log onto a system, the contents of the script file are sent to that system.

So if you have to go through some long and convoluted login procedures, you can
put the commands into a script and have the computer automatically log in for you.
This is handy, both for legitimate users, and for hackers who happen to gain access
to those script files.> that contained phone numbers, passwords and other login
procedures. Always look for such things when you snoop.
Snooping can bring to you those tutorial and simulation disks, as well as damaged
disks, trash
33
and insider literature which one can only get from either being employed by a
company, or by snooping around. It adds a bit of physical excite-ment to the
usually passive art of hacking, and it gets you away from the eyestrain of computer
screens for a while.
It is not always necessary to research before a hack, but it is always helpful.
Research in any form doesn't have to be undertaken with a particular hack in mind.
Like my random snoopings of the torn-apart building and the university lounge,
general explorations can lead to fruitful information. In other words, all hacking
doesn't have to be done on computers. There is also such a thing as the person
who hacks -joyously -life.
34
Chapter Four
Passwords And Access Control
Three dominant classes of access control have developed to protect computer
installations.
They are:
• knowledge-based controls (passwords)
• possession-based controls (keys)
• controls based on personal characteristics (biometric devices)
Possession-based controls have to do with things the user owns, like a physical key
or mag-netic card. Sometimes there is a metal clip of a pe-culiar shape that must
fit into a hole in the com-puter before the computer will operate. A "key" could also
be an identification badge, or a signed letter from a person of high status in the
company, granting permission to access a site.
Biometric devices are those which look at some trait of a potential user and
compare it to traits previously recorded, such as fingerprints, signa-ture, or
geometry of the hand.
These two forms of computer security may be designed for remote access control,
although usu-ally they are implemented at the site where the computers are
located to limit access to either the computer room or the computer itself. Thus,
de-scriptions of biornetric and physical keys will be further developed in the on-site
hacking section of this book.
The first class of access control - also the most common - is knowledge-based.
That is, control is limited to those persons who can prove they have knowledge of
something secret, usually a pass-word. Discovering that password constitutes a
large portion of hacking. Here, then, is everything you need to know about
passwords: how they work, how they are stored, and how they are bro-ken.
Passwords

The cheapest and easiest way to protect any kind of computer system is with that
old standby: the password. Even computers that under normal circumstances have
no need for security features o . ften come equipped with password protection
simply because it feels good to use and doesn't cost much in terms of time, effort or
storage space to implement. Furthermore, systems which are pro-tected by other
means - by magnetic cards or by software alternatives such as encryption - will
35
double or triple the security of their assets through the use of a password system.
Thus, on practically all computer setups you are likely to encounter passwords of
one form or another.
Passwords are usually thought of as the en-trance keys to a computer system, but
they are also used for other purposes: to enable write access to drives, as
encryption keys, to allow decompression
of files, and in other instances where it is important to either ensure that it is the
legitimate owner or user who is attempting an action.
There are seven main classifications of passwords.
They are:
• User supplied passwords
• System generated random passwords
• System generated random passcodes
• Half and halves
• Pass phrases
• Interactive question-and-answer sequences
• Predetermined by code-indicating coordinates
If you intend to hack a computer installation you will first have to figure out which
of these seven password
types are used by that system. The first type is the most common; generally users
are asked to think up a personal password for themselves.
System generated random passwords and codes may be of several kinds. The
system software may supply a completely random sequence of characters - random
to the point of cases, digits, punctuation symbols and length all being deter-mined
on the fly - or restraints may be used in the generating procedures, such that each
passcode conforms to a prearranged constitution (like "abc-12345-efgh" where
letters and numbers are randomly generated). Or, computer-produced passwords
may be taken randomly from a list of words or nonsense syllables supplied by the
pro-gram authors, thus creating passwords like nah.foop" or "car-back-tree".
Half and halves are partially user-supplied, while the rest is composed by some
random proc-ess. This means that even if a user supplies the eas-ily-guessed
password "secret," the computer will tack on some abstruse gibberish at the end,
forming a more secure password such as "secret/5rhll".
Pass phrases are good in that they are long and hard to guess, but easily
remembered. Phrases may be coherent, such as It we were troubled by that," or
they may be nonsensical: "fished up our nose." Pass phrases are used when the
manager of a site is particularly security-conscious. Usually you don't see pass
phrases required by a system, although the programming required to enforce a
pass phrase rule is trivial.
Related to the pass phrase concept is the phrase acronym, which security experts
have been ap-plauding as a short but equally safe form of pass-word. In a phrase
acronym, the user takes an easily remembered sentence, phrase, line from a song

or poem or other such thing, and uses the first letter of each word as the password.
For example, the acro-nyms for the two pass phrases above would be wwtbV and
"fuon." You can see that innovations in password theory such as this will greatly in-
crease the difficulty hackers will encounter in fu-ture electronic espionage.
The sixth password type, question-and-answer sequences, requires the user to
supply answers to several (usually personal) questions: "Spouse's maiden name?",
"Favorite color?", etc. The com-puter will have stored the answers to many such
questions, and upon login will prompt for the an-swer to two or three of them.
These ques-tion/answer sessions can be delicious to the hacker who is intimately
familiar with the user whom he or she is attempting to impersonate. Systems
which use question-and-answer sequences also tend to be programmed to interrupt
users while online every X minutes, and require them to answer a question to
reaffirm their validity. This can get pretty annoy-ing, especially if someone's in the
middle of an ex-citing online game when it happens. Q&A is used only rarely
nowadays. When it was first proposed it seemed like a good idea, but the
bothersome fac-tor has resulted in this method being pretty much phased out.
Passwords which are predetermined by code-indicating coordinates usually rely on
some external device, such as the code wheels used to de-ter software piracy. In
any case, a set of key prompts are offered by the computer, and the user is
required to return the appropriate responses to them. You'll often see this type of
password being used on a system with once-only codes.
Once-only codes are passwords valid for only one access. Sometimes they are used
as temporary guest accounts to demonstrate a system to potential clients. Once-
only codes may also be employed by the system to allow actual users to log in for
the first time; the users will then be expected to change
36
their password from the one provided to a more se-cure, personal code. In
situations where groups of people must log in, but security must be main-tained, a
list of once-only codes may be provided. Users then extract one code at a time,
depending on external factors such as time, date or day. Maybe you can find a list
of codes by going through the garbage of a place? The codes won't work anymore,
but you'll get a sense of what the system expects from you.
Passwords Supplied By The User
Most passwords are of the choose-it-yourself variety, and due to security awareness
most con-temporary programs which ask for a password to be supplied will not
accept words of a certain short length which the program deems to be too easily
"hackable." Most passwords will be more than four or five characters long. Other
measures to protect users from their own lack of password creativity might be
taken as well. For example, systems may force passwords to contain a mixture of
upper and lower case, numbers, and perhaps disallow obvious passwords (such as
"computer").
Software is available for most operating sys-tems which looks through the
computer's pass-word files, analyzes user passwords and decides how secure they
are. Unsecure passwords will be changed, or prevented in the first place. This is
one area where your prior research should help you. Generally you will know which
of these programs your target has installed, and what passwords the software will
not allow.

Regardless of how clumsy-brained or brilliant a person is, all people tend to think
alike. It is only through learning that they begin to think in crea-tive ways. Even
then, initial assumptions and first conclusions are similar for a given peer group.
What this means is that when a person logs onto a computer for the first time, and
is prompted for a password - especially if that person is under stress of time or
place - that password is likely going to be a variation on some common themes.
Imagine some of the situations people are in when they are asked to create a secret
password for themselves. They may be calling a remote com-puter over a long
distance phone line, or sur-rounded by a group of technicians who are there to
teach them to use the system. In any case, the prompt is there on the screen and
with it, a sense of urgency is brought to mind. People type the first thing they
think of, the first thing they see, or hear, or are hoping to do once they get past the
login procedure. The password is entered quickly, and rarely is it changed to a
better, more secure one.
Thus, many passwords relate to top-of-the-mind thoughts, such as job, family, pos-
sibly current events, possessions, environment, hobbies or interests. If you can
either find out or guess any of these traits of a valid system user, the number of
potential passwords you will have to guess will decrease significantly.
Get catalogs from the companies that make wall posters, humorous mugs and other
novelty items one finds around offices. How many times have you seen that tired
phrase, "You don't have to be crazy to work here... But it helps!"? I guarantee the
word "crazy" gets picked off that mug every day as a password. Think about the
age and life-styles of the average user whose account you are attempting to
breach. An office in a corporate set-ting probably wouldn't have a nudie poster
hang-ing up - but a college dorm would, and so you may get passwords such as
"playmate," Nictoria," "body," or "month."
The easiest way to get a password is to enter it yourself for the user, or to supply
the password to the user who is logging on for the first time. You might be acting
the role of computer tutor to a novice, and while showing him or her the ropes,
downplay the security aspects and allow him or her to tell you the password as they
type it, either because they spell it out loud, or because you watch the person's
eyes light up as his or her gaze falls upon the wall poster with the word It
surfboard" written across the top. (Or they say, "Gee, what's a good secret
password? Oh, I know - " and proceed to spell it out to you as they hunt and peck
at the keyboard.) Most often you will be hacking away at user ac-' counts that have
been long-established. On these ou will have to use some kind of either brute force
method, observation, social or technical method of password retrieval.
Most passwords are dictionary words, like "subway," "table," "chocolate" or
"hotdog." Hon-estly, can you imagine any computer novice sitting
37
down and entering "fMm6Pe#" as a password? Of course not!
Scrabble rules do not apply here: proper names are allowed in password creation,
as are misspellings, abbreviations, non-words and foreign terms. Thus a person
who likes watching Star Trek may have the password "enterprize" instead of the
cor-rect "Enterprise." Whether that's due to bad spell-ing habits or because he or
she simply likes it better that way is unimportant. What is important is that you
have to be aware that misspelled words exist in passwordland. You are going to
find the letter "k" used in place of hard "c," as in "koka kola." You will find N" for
"ks" (thanx), and other phonetic substi-tutions, like "lether," 'Tone" and "stryker."

Some hackers will go through every word in the English language until they find
something that works as a password. If the password they seek is a real word, but
isn't spelled correctly, they are going to be wasting vast amounts of time.
Complete brute force dictionary attacks are often fruitless, useless, adolescent ways
of doing things.
Many words recur frequently as passwords, and examples are given in the
appendices. However, there are many words that you would almost never expect to
find as a password on a system. Is it reasonable to suspect a person will enter an
adverb for a password? Words of this sort would be the last ones to try. Real-word
passwords will generally be nouns, ("eyeball," "drums," "kitchen"), verbs, (usually
obscene ones), and perhaps adjectives ("purple," of great, " "happy").
Girl friends, boy friends, and the cute pet names they give each other are popular
passwords; these you would have found out from prior re-search. Also semi-
popular are passwords with the word "sure" embedded inside them, as in "forsure"
or "fursure," "surething" or "asb" (short for "a sure bet"). Besides dictionary words,
you can expect to find names of relations, streets, pets, sports teams and foods;
important dates and ID numbers, such as social security numbers, anniversaries, or
birth-days; and keyboard patterns. Examples of key-board patterns include
'Akjkjk," 700u," 11WXYZ,11 it ccccccc," "0987654321," "asdfgh" or 'I qazwsx." Look
at the location of these letters on a keyboard if you are confused about these last
two examples. Keyboard patterns will usually be simple repetitions of characters,
portions of columns or rows or every-other-letter designs. Keyboard patterns may
be wholly unguessable and yet fully logical when you know what's going on at the
other end of the phone line. For example, "05AP may seem a funny thing to pick
up from a keyboard, but when you know the computer in question has a special
hexadecimal keypad attached, the whole thing starts to make sense.
Figure 4
A hexadecimal keypad, used by some computer
programmers to allow fast entry of numbers in
base 16. The keypad illustrates a principle
smart hackers will follow: That what you

see on your side may be different from
what they see on theirs.
Some keyboard patterns I've actually seen be-ing used on systems: "abcdef,"
"qwerty," "12345," foxxxxxx " "opopopopp." If you know the minimum password
length is six characters, don't expect pat-terned passwords to go much beyond that
mini-mum. On the other hand, you can't reasonably try out every possible pattern:
there's an infinite num-
38
ber. Beyond a certain point, guessing keyboard patterns is strictly reserved for
amateur hour.
Possible Password Investigation
One of the sources I used to research this book was an unofficial manual for a
popular fee-based information service. Throughout that book, the author
continuously made references to her pet cat, her love of Philadelphia soft pretzels,
her favorite football team, her husband and children, and her newly acquired
interest in computers. Not only did references to these aspects of her life abound in
the text, they also appeared in illustrations of the serv-ice's "Find" command,
sample messages and sam-ple letters.
I knew the author's name, of course. I knew she had a membership on this
system, and I knew about her life. It was insanely simple to get her per-sonal ID
number on the system and, yes, within two dozen password guesses, to access the
service under her account. She has since taken my advice and changed her
password.
This isn't an isolated example! Every day you and I read newspaper articles,
magazine columns, and books - in which the authors give away their computer
addresses so readers can respond. Yesterday I heard a radio talk show host give
out his CompuServe address for the large listening audience who didn't get the
chance to speak out on the air! We know enough about many of these authors and
others to be able to make educated guesses of their passwords. Even if an author
doesn't mention personal details in the book, there's usually an "About the Author"
section to turn to for facts. Many computer books are written by college professors;
naturally you'll know what college they're at, and so you have a lead to an ac-
count. If the sample program segments they list en-tail baseball trivia, you've got
a good idea where to begin a brute force siege.
With all of this said, I want you to realize this is for informational purposes only. I
made the above remarks only to point out some of the lax security around anyone
in the public eye. Don't get any funny ideas about breaking my passwords!
Another trick is to look in Who's Who books. Almost all industries have a yearly
Who's Who published. Many of these are vanity affairs: people pay to get a write-
up about themselves listed. You can get good data from these, and if you can't get
enough good data, print up your own official-looking Who's Who form and mail it to
the person you have in mind at the company. Make sure the accompanying letter
states that once they fill out the form, their entry will be included free of charge in
the eventual book, and they will receive one copy of the book, free. This will help
ensure that they mail you back the form. It also ensures you get good data to help
you crack their passwords.

One more helpful subterfuge, this one involv-ing socializing with cronies at the
company. Call up an office and talk to a receptionist or anyone who knows
everyone's gossip. Say you're from a new trade magazine specializing in that
business's field of endeavor. Ask for the names of all the major department heads,
and their secretaries, so you can send them a free trial subscription. Then call back
and talk to each of their secretaries. Have them fill out "market research" cards,
again for some prize, like a free subscription or a clock radio or something. Typical
marketing questions for trade magazine subscribers include inquiries about
schooling, degrees held, industry awards, trade association memberships, military
service, salary range, and length of service at the company. As the conversation
continues, start asking about hobbies and outside interests, favorite sports, names
of kids and spouse, and home address. These too are acceptable questions for a
market research surveyor to ask; they are also valuable possible password leads.
The short version of this is to call up, say you're one of the assistant editors for a
trade magazine, and you're trying to find interesting people in the field. "Do you
know of anyone there who has done anything at all spectacular, or has any
particularly unusual hobbies?" You might get a "no," but keep pressing: "Anyone
with special talent? Musical tal-ent, for instance?" Keep going like this; eventually
you'll hit upon something, and you can use the above tricks to find out more about
that person than you ever thought you could.
Uncovering a subject's interests is called making up a personality profile or, for
hackers, a password profile. The technique is done whenever the hacker has a
specific individual in mind, whose computers the hacker wants to crack. If you
wanted to read the e-mail and other private files of some
39
head honcho at a corporation, you would go find reports of said honcho in the
media, see what he or she likes, and go from there. One popular strata-gem,
mentioned by Hugo Cornwall in his Hacker's Handbook, recognizes the fact that
often a chief per-son in an organization is given an account to dem-onstrate the
new computer system, under the as-sumption that setting up a new account is too
diffi-cult or time consun-dng for the busy leader to do on his or her own. This
account will of course have a natural English password, something of either the
easily-guessed variety, or something from the boss's list of interests. ("Say, Mr.
Larsen likes fishing, doesn't he? Put in 'FISH' as the password!")
So let's suppose you know a person's hobbies or interests: From there, how do you
proceed?
To start, you could go to a library and get all the books you can on that subject.
Then make up word banks from the glossaries and indices. People like to use big
and (they think) obscure names/words from their coveted subject which they think
no one else would ever think of. So you get students of literature using names for
passwords, like "Euripides," "Aeschylus," and in general, a mess of lengthy technical
terms.
Make up word lists, try them out, and if all else fails you can go on to a new
password type. Just because someone's a doctor doesn't mean his pass-word will
be "pericardiocentesis." People's lives are composed of many subjects, their
occupation being just one.
Password Studies

If you think all of this talk about easily guessed passwords is balderdash, think
again. A good number of formal and informal studies have been done to see just
how good people are at picking safe passwords.
One such experiment found that out of 3,289 passwords
• 15 were a single ASCII character,
• 72 were two characters,
• 464 were three characters,
• 477 were four characters long,
• 706 were five letters, all of the same case, and
• 605 were six letters, all lower case.
The point being this: That hackers can simply sit down and guess passwords is
FACT not FIC-TION. It can be done, and sometimes quite easily.
Another example of the ease with which passwords can be hacked is the Internet
worm which squirmed through the net, disabling much of it, in 1988. The worm
had two tactics it used to spread itself, one of which was attempting to crack user
passwords. It would first try inputting the typical passwords, like login name, a
user's first and/or last names, and other variations of these. If that didn't work, the
worm had an internal dictionary of 432 common passwords to try. Finally, both of
these methods failing, the worm went to the UNIX system dictionary, attempting
each word in turn, until something hopefully worked. As we know, the worm's
method worked superbly.
By the way, if you're ever on a UNIX system and need to do a brute force attack to
gain higher access, the system dictionary is very helpful. You can find it in a
subdirectory called Vusr/dict." The file is called "words." You can also download this
file or capture it to another computer, if you need a plaintext dictionary file for use
on other machines. < One problem with using the UNIX dictionary "straight from
the box" is that the words it contains do not genuinely reflect words in common
English usage. There is a high preponderance of scientific words, due to the
manner in which the dictionary was constructed >
Password Restraints
Most operating systems weren't developed with security as top priority. Indeed,
password-based accounts should be all the security required on a time sharing
system. As we have seen, however, too frequently passwords are chosen that are
easy to guess. The UNIX operating system does restrain password selection by
suggesting that passwords contain no less than five lower case characters, or only
four characters if at least one of those is nonalphabetic or uppercase. However, if a
user insists on a shorter password, disregarding the plea that security be
maintained, that shorter password will be allowed.
Sysops know that most passwords aren't secure, so many have installed programs
which disallow obvious passwords from being generated.
40
Passwords are then forced to conform to certain characteristics, such as:
• Passwords must be of a certain length.
• Passwords must include a mixture of upper and lower cases.
• Passwords must include one or more numerals.
• Passwords must include a non-alphanumeric symbol.

One or more of these constraints might be en-forced. The program may also test
the user's password against a list of known "bad" passwords, which are not allowed
to be used.
Not allowing single-case passwords or strictly alphabetical passwords does add
some difficulty to a guess-attack, but not much. One time I had some-one in mind
who I felt certain had "popeye" for a password, due to his large collection of classic
comic books and the big deal he always made about Popeye. The system software
required a mix-ture of cases (which helpfully informs you, by the way, that upper
and lower case are distinguished by the system), so instead of just trying "popeye",
I tried:
Popeye PoPeYe popeyE
PopEye popEYE popEyE
PopeyE PopEYE PoPeye
and also tried each of these with cases reversed, such that PopeyE became pOPEYe
(in case the user thought of capital letters as normal for computer keyboards, and
lower case the exception). It was highly unlikely that this particular Popeye lover
would try anything so bizarre as capitalizing in the middle of a syllable, or without
some pattern to it. Indeed, when forced to capitalize, who in their right mind
would?
As it turned out, his password was "OliveOyl."
If not capital letters, numbers might be forced into one's password upon first login.
Again, you can hardly expect Joe User to break up syllables with a number, and the
numbers that are used you should expect to be not more than one or two dig-its.
After all, the user thinks of it as a password. The number will generally be slapped
on as a necessary afterthought.
Thus, what you will normally find are passwords in the following forms:
password #
pass # word
# password
Numbers will be those which are easy to remember, or easy to type, like 1 or 0.
Numbers from one through 31 should be most common, along with numbers either
repeating, ending in zero or nine, such as "888," "500" or "1999." It is reasonable
to expect typists to use the numeral "1" substituted in for the letter "I" (lowercase
"L"), in passwords which contain that letter. Cyberspace devotees might do
likewise, as well as using zero for their required number, putting it in place of the
letter "O." This means that if you ever suspect a word that contains the letters "L"
or "O," instead of finding something like "cool," "computer," "lucifer," "lemon," or
"colts," you may find `c001," "cOmputer," "lucifer," "Iern0n," and 'Wlts," where the
digits 1 and 0 have replaced the appropriate letters. (Actually, "c001" is usually
spelled 'k001.")
Computer Generated Passwords: Fakery and Analysis of Machine-Generated
Passwords
Many passwords that the computer generates on its own will have some flavor of
randomness to them. For instance, look at this bit of imaginary program segment:
5 Randomize Timer

100 For i = 1 to 6
110 Char = Int (Rnd * 91)
120 If Char < 65 Then Goto 110
130 Password = Password + Chr$ (Char)
140 Next i
200 Print "Your new password is: "; Password
Here, six uppercase letters are selected inde-pendently and concatenated to form
the password. The way the letters are selected is that a random number between
65 and 90 is chosen - this corre-lates with the ASCII code for the letters of the
uppercase alphabet. The randomness of the numbers chosen is based upon the
randomizer function being used. In this case, pseudo-random numbers are
generated based upon the exact time of the computer's internal clock, although
randomization could also have been based on a practically infinite, hardware-
dependent range of inputs. I said pseudo" random numbers because no matter how
random these numbers may appear to us, to the
41
computer they are just values plugged into a formula.
If the password-making program could be altered in the right way, then all
randomly-generated passwords after the time of alteration may be yours for the
taking (or deducing). If you have the ability to change the program and save the
changes to disk, or the ability to reroute the password-making subroutine, then
here are some further items to consider.
The easiest thing to do would be to change the program by getting rid of the
randomization factor entirely and simply inserting a "Let Password$ = "EVBIDCL8....
statement. Then every new user would be given the same seemingly random
password. The problem is this is not going to go unnoticed by the system
administrators (although you might be able to restore the original program before
your change is noticed).
A more logical choice is to have the program generate a random-looking password
based on some information about the user that you can eas-ily determine from
publicly available sources, such as the user's birth date or Social Security number.
Then you can simply plug that piece of information into your copy of the code on
your home computer and reproduce the new user's password. One encoding
algorithm that works well is to take the sine of the ASCII value of the first six or
eight characters of the user's name, then take the second-to-last two values of the
sine, convert them to fall within a suitable range, then concatenate the
corresponding ASCII characters to form a "word." Thus you have a random-seeming
password that can be easily constructed, even by hand. If the username is less
than six characters, the remainder could be filled in by a predetermined set.
(See Figure 5.)

A sample username is encoded into an obscure password using the method
outlined in the text. On inspection the password seems random and secure, but
a hacker can determine a user's password using publicly available information
about that user (in this case, the user's last name).
42
This is just a simple example; your password would have to comply with case
mingling, length, or digit sprinkling requirements where appropri-ate.
Forcing a password in this way can help if you run an electronic messaging or
bulletin board system: users may get so comfortable with their new, secure
passwords (wouldn't you think "rueavz" was secure?) that they transfer them over
to other accounts elsewhere.
Another possibility, again requiring the ability to covertly change the password
generator, is to al-ter the randomizer's seed to a constant value, thus causing the
program to produce the same series of random numbers each time it is run (as long
as the computer stays on and the program is not reset). This is risky though, and
unwanted side effects may result.
One method utilizing the flaws in pseudo-random number generators was actually
accomplished, and reported on by UNIX co-creator Dennis M. Ritchie in a 1986
security bulletin en-titled "On the Security of UNIX." To increase security at a
computer installation, the administrat-ors decided to provide safe, computer
generated passwords. Each password would be a string of lower case letters and
digits, eight characters long. This calculates to 2,821,109,900,000 passwords
which, according to Ritchie, on a PDP-11/70 would take 112 years to brute force
through all those combinations. But the hacker knew that the random number
generator could only take 32,768 seeds, and so only that many possible outcomes
needed to be looked at. "The bad guy did, in fact, generate and test each of these
strings and found every one of the system-generated passwords using a total of
only about one minute of machine time." [Emphasis added.]
Clearly, sixty seconds plus some programming time is worth spending to have
access to every ac-count on a system!

If you can't insert code to generate machine-made passwords, you might be able to
analyze them after they've been produced. This requires having access to a
minimum of one password, preferably two or more, from a given system. If you
have a legitimate account, there's your first password. If it's a local BBS you're
hacking, or some other sort of system where multiple anonymous logons are
possible, try calling back a few more
times and collect new passwords under different names. Or get ahold of the BBS
software or the password-generating routine, and work that to collect various
passwords.
Once I was going through some new BBSs that had started up and I came across an
ad for a system that was a couple states over but still seemed worth a try. I called
up, logged in as a new user, and found it wasn't all that interesting after all - run by
a factory supervisor mainly to let site agents or-der inventory stock. I used the
made-up name and address Roger Eichner, 13 Stem Court, North Coast, WA 64203
to log on. The password that was generated was "roghner24." I was astounded!
Obviously the program had simply taken the first three letters from my first name,
the last four letters of my last name, and stuck a number at the end!
Or had it? I called back a second time, logging in as a new user with a different
name. This time there seemed to be no correlation at all with any of the personal
information I had given. Now I was not only astounded " but confused as well! Had
the first password been simply a fluke? Was the second a fluke? Was it
programmed to only sometimes use parts of the username? I called back a third
time and again logged on as a new user. Again the password was unrelated to
anything I had entered. Now I was pretty positive the first password had just been
an unbelievable coincidence. I wrote a message to the system operator, saying he
could delete these three new users of his (I supplied their personal info so he would
not think I was playing a joke) and I didn't call back until a few weeks later.
Even though my second two passwords were unrelated to both each other and my
personal data, I thought that perhaps I had missed something that first encounter,
since some of the characters were repeated from one password to the next. Could
these characters refer to my baud rate or computer type, or some other parameter
that had stayed the same from one login to the next? Or was it possible that what
was random about the passwords was which pieces of data it selected to insert into
the password? This would account for my name in the first case, and one of the
items (which I didn't recognize as relating to me) being repeated in the third call
password.
Logging on with the same name, address, terminal characteristics and everything
else as I had originally done, I received, to my disappointment,
43
not a computer-generated password but the following astonishing message:
Dear Member:
Sorry about having to go through this again but we've had a problem the last few
days. I will have to ask that you be patient with the low access level you will
receive until I get a chance to validate you. Please note, when asked to supply a
password do not give the one you were previously assigned. Make up a new and
totally unconnected password.
See General Posting #1 for explanation.

StRaPmAsTeR === wllLiE ===> (sysop)
Input Password ==>?
General Posting #1 said that a certain (relatively new) user of the BBS, whose
handle was Mr. Joke, had kicked into action a "feature" of the BBS soft-ware that
produced less-than-secure passwords. The previous year the system had "crashed,
appar-ently as a result of a rogue program that was uploaded to file section by Mr.
Joke." No further de-tails were given on the cause or nature of the crash, because
apparently regular callers of the system al-ready knew the story.
Anyway, you can see how it's possible to occa-sionally get some good information
by analyzing of random" passwords. Even if there doesn't seem to be any
discernible pattern, that doesn't mean there isn't one hidden somewhere. There
might be some subtlety to the pattern or, if not a pattern, a bug or strangeness
that you might be able to spot. For example, in the first version of one BBS
program -a program that was so godawful the board folded after about a month -
the random password generator would never produce a password with the letter A
or the digit 0 in it. Knowing this does help a little: for a seven character password
of the form WXYZ123, where WXYZ are letters of one case and 123 are numbers,
there are only 284,765,630 possible combinations of letters and numbers, instead
of 456,976,000 - a difference of 172,210,370 passwords! This software was riddled
with bugs, many of which have become famous as the worst blunders in the history
of horrible programming.
Non-Random
Machine-Generated Passwords
Finally, let's consider randornless machine-made passwords. Often users are
entered into a computer system before their first logon. Then, unless the sysops
can relay information to users off-line, the password must temporarily be some-
thing that the user already knows, such as their Social Security number (SSN), date
of birth, or other personal data. Users are supposed to change this easy-to-guess
password to a more secure one, but unless they're specifically shown how or
required to do so, it is unlikely they will follow through.
Here's a non-computer example which demon-strates this weakness. In April of
1992, students at a New Jersey university received a memo, informing them of new
over-the-telephone class registration procedures. The memo stated that the
Personal Access Code (PAC) assigned to authenticate one's registration was the first
four digits of one's birthdate (month and day), entered in conjunction with one's
nine digit student ID number (essentially, one's social security number).
What got me was that first of all, they told students that their top secret PAC was
their birth date. This violates all the security precautions they're trying to maintain.
After all, how difficult is it to find out someone's birthday? But the PAC is only half
of the "password" - the other part is a student ID.
Again, it's a piece of cake to find out someone's ID. lDs are publicly or semi-publicly
available at the student health centers, on computer room sign-up sheets, on
identification cards, class rosters, housing lists and elsewhere! The memo does say
that those concerned with security can come into the registrar's office to change
their PAC, but who's going to go out of their way to do that?
Anyway, changing just those four numbers doesn't do much to stymie the
determined hacker. Following a change of PAC there are 10,000 minus one
possibilities to try. This is as opposed to the mere 366 possible PACs before that

security-aware person changed his or her number. Sure, ten thousand is a lot of
numbers to try, but it's certainly not impossible. A touch-tone auto-dialer can
phone
44
through all of those in about seven minutes, given unlimited PAC-entry retries per
phone call. In any case, I'm using this story to illustrate the principle of least
resistance: Users are not going to go out of their way to change access codes if
they don't have to. And even if they do, it doesn't matter much. After all, we are
hackers.
Let's move back to our discussion of non-random passwords which are generated by
computer; or rather, passwords decided upon by the programmer or administrator
and selected from data files by the computer.
Computers will select passwords any time a large number of passwords must be
assigned at once. During the first week of a college semester, thousands of new
accounts must be created for students enrolled in computer classes. For the most
part, these accounts are going to be set up with username equal to some truncation
or bastardized form of one's real name, and the password will be either one's Social
Security number (SSN) or student ID number.
So if you want to hack a college system, start early in the semester - before those
passwords get changed by the user to something more secure. Social Security
numbers may be easily hacked by brute force, especially when you know how they
are distributed.
Social Security (or other ID numbers) may also be obtained through social means
(see the chapter on Social Engineering) or by other forms of chican-ery. I've sat in
on college classes where the instruc-tor hands around a sheet of paper, on which
the students are asked to write their name and ID number. This sheet is then
handed to the teaching assistant, who enters this information as accounts into the
computer system. If you happen to find some classes that operate like this, make
sure you sit in the back of the class, where nobody will no-tice you copying other
people's private data. A hand-held scanner/copier makes life easier at times like
these.
You can also get names and SSNs from atten-dance sheets, or class rosters, which
usually list both pieces of information for every individual in the class. If the
professor doesn't make the roster available for student perusal, make up some
excuse to swipe a look at it. For instance, say the registrar had your name
incorrectly spelled on your last transcript, and you want to make sure they've
corrected the problem. Professors will love any excuse that points out slip-ups in
the bureaucracy of the school system. Use their mindset against them!
Several court battles have ruled that use of one's Social Security number in
conjunction with one's name in a public environment is unconstitutional, as it is an
invasion of personal privacy. Therefore, we may see a trend starting, with SSNs
getting used less and less for identification purposes, and an organization-defined
ID number being used in its place. If that's the case, you will have to rely more on
brute force to access the array of ID numbers assigned to a person.
Pre-usage passwords won't always be Social Security numbers or other ID numbers.
If some non-computer communication is possible between the sysadmin and the
user, other words may be as-signed as temporary passwords (to be changed when
the user logs on).
There might be a generic "new user" password which is given to all accounts, which
shouldn't be very hard to crack. Or the password might be something very obscure

and security-conscious, like some long string of random characters. It may be
necessary to intercept the new user's physical mailbox for that envelope which
contains the as-signed password.
Programs Are People Too
Sometimes computer systems are set up with programs that have usernames and
passwords, just like any other user of the system. Thus if you login as that
program, the program is executed. Programs might be a tutorial on how to use the
net-work, information system, database, messaging system or just about any sort
of application program. Some sites also have accounts whose user-name is that of
an elementary command, such as "time," "date" or "who" (which tells, you who is
logged on). This allows people to carry out certain quickie functions without having
to go through the hassle of logging on to the machine. Often these command
accounts don't have passwords associated with them, which is ironic since many are
given superuser access permissions.
It's possible that you may get in to one of these program users with a
name/password combination chosen from words such as these:
45
guest demo help
info tutorial tut
menu data base
intro anonymous database
visit welcome hello
"Visit" or "visitor" might be the username, and "tut" the password, for example.
Other possibilities are trying to get in with usernames "calendar," It cal,11 #I
sched," "schedule," " whois," "ftp," "who," "Ipq," "archie," or other common
command names. Many installations will have a general-usage or even public
information system set up. Access may be gotten by logging in as "info," as
suggested above, but other variations are possible. The fictional Wakka Doo
University may require logging in as "wdu," "wduinfo," "hellowdu, "wdunews,"
"wdumail," " welcomewdu," or some other variation on the University's initials.
If you do manage to get in this way, first of all you are to be congratulated for a
very successful hack - but then what? If you are interested in gaining higher
access levels or in escaping out of the program entirely, you could have a lot of
diffi-culty ahead of you. An upcoming section will offer suggestions for getting
beyond limited access restrictions.
Brute Force Methods
Brute force means manual labor for your computer and, usually, lots of it. It isn't
too difficult to do, but it is time consuming. What brute force methods entail is the
inputting of one password after another until finally - maybe - something hopefully
works. Or just until you give up and move on to a better method.
Brute force methods are usually the first and last thing a hacker does when trying
to break into a system. The first time he does it, it's a half-hearted attempt. If he
can guess the password right away, or after the first seventy-five or hundred
attempts or so, then that's fine. After that fails it's on to trying out other angles for

a while. If none of those more sophisticated ways work, then it's back to brute
force for the big finish.
Brute force, after all, must work eventually. The "must" is what draws hackers to
it; the "eventually"
is what drives them crazy. Brute force takes a lot of time, but not much else. That
time is spent in research, trial and error, and in writing special programs to hurl one
password after another at the system.
Brute force is the least graceful way to fly, but since it eventually must be effective,
eventually all hackers will resort to using it at one time or an-other.
You may find yourself in a situation where you know nothing about the people who
use a particu-lar system; where common names and passwords have failed; and
where no trick seems to work. In these cases, you will have to try the most brutal
of all brute force approaches: you will have to write a little program that will
repeatedly dial the com-puter system, enter a new name/password combi-nation,
and keep repeating this until something works.
This could take forever.
Some hackers use a dictionary file they get from their word processing programs or
off a bulletin board. This is a good idea, but only if you use it properly. Edit the
dictionary file so it includes common names, each letter of the alphabet, musi-
cians, names of cars and presidents, numbers, ce-lebrity nicknames and other
common password material. Get rid of the words like "perspectives" that just seem
too weird for anyone to use as pass-words.
Speaking of making things go faster for your-self, the same holds true when brute
forcing non-language passwords. If you live in New York, you should begin your
attack by brute forcing New York SSNs only. There are many ways to bring down
the number of potential codes you have to check. The military uses what is called
the TAC Access Control System (TACACS) to ensure legitimacy of usership of its
network computers. The access codes that TACACS looks at are strings of
alphanumeric characters - but the strings will never contain the numerals zero and
one, nor the letters Q and Z. The theory behind this decision is that a user reading
his or her access code off a code card can easily confuse Is, Os, Qs and Zs with
other letters or numbers.
Once you have edited your dictionary of possible passwords to best suit your needs,
or once you have determined which codes are the ones most likely to occur, you
write yourself a little
46
program in whatever language you know, to dial the modem, enter one word at a
time as a password, and try, try again. And again. And again. This is a simple
program to write, but if you don't have the expertise to do so, plenty of programs
like this are available on BBSs.
There are some things to consider when writing the program. How many times will
the computer system allow you to enter bad name/password combinations before it
logs you off? Three? Eight? If it gives you three chances before saying bye-bye,
make sure your program outputs exactly three name/password combos before
redialing the number.
Often remote computers will accept characters as input even before the input
prompt is put on the screen.
If this isn't the case with the system you're trying to get into, you'll have to put a
delay loop in your program to make sure passwords are not being entered before
the cursor is on the screen.

Finally, what happens when your program does manage to ferret out a workable
usernarne and password? Unless you're sitting there, monitoring the computer as it
does its thing, you need some way of knowing when a brute force attempt has been
successful. Otherwise your program will continue to spit out passwords, and the
system operators - who by now almost certainly have noticed what is going on - will
be absolutely furious! Have the program monitor text as it is sent from the remote
computer. When something other than the login prompts are received, have the
program flash the screen and ring the loud bell on your printer. Either that, or have
it input the logoff command, and print the usable username/password on the screen
for you to see when you wake up the next morning.
If you know Joe User works for Company X, then you can have the program run
through every combination of password with usernarnes Joe, User, JUser, and Joe
User - not to mention other varieties like joe, JOE, and joeuse. (But from your
research and experimenting you should have some idea what format the username
will be in, so you shouldn't have to try too many variations.) If, on the other hand,
you don't know the name of anyone who works there, you'll have to either find out
(i.e., look in company directories, call up and ask, look in annual reports,
newspaper articles, or any of a hundred other places to find names) or try every
combination of possible first names. If you must resort to trying every first name,
make sure you try female and foreign names. You might want to take a trip to the
library and find out what the most popular first and last names are. But remember,
you don't need the current popular names - you need names that were popular and
common twenty or thirty years ago, when parents were naming the people who
work in the company you're trying to break into.
Certainly, it is not absolutely essential to write a program to spit out passwords. If
you have the time and patience, you can sit down and enter passwords yourself.
But remember that this will take even longer than the already immense amount of
time it takes a computer to brute force its way in. I must emphasize that no matter
how many pre-cautions you take to eliminate excess work, brute force will almost
always take an extremely long time to bring results. Therefore, it's important to do
what you can to speed up the entry of passwords. If you have to redial the modern
after every three passwords, make sure you're running your attack off a phone line
with Touch Tone capabilities.
Also, before you begin a brute force approach, set yourself up with the highest baud
modem you can possibly acquire, even if you need to borrow one from a friend.
Moving just a few notches up the baud ladder makes a big difference in speed.
Foiling The Brute Force Assault
As a youngster I remember going out to dinner with my family one night, where
they had an all-you-can-eat special. Naturally I decided to do my part to see that I
ate my fair share but by the third reorder, we were getting increasingly frustrated
with the long waits and smaller portions. My dad explained it: "You see, that's what
they do so you won't eat as much. They keep taking longer and longer to come out
with the food, and they give you' less of it." I don't know how true that was, but
after a while it certainly was not worth waiting around forty minutes just to shovel
down another plateful of food.
The techniques used to thwart brute force at-tacks work on the same principle as
that all-you-can-eat restaurant. As mentioned earlier, if one is
47

persistent enough then it is really only a matter of time before a legal
username/password is hacked by guesswork or by chance. Therefore, the way to
prevent such an attack from succeeding is to struc-ture the system prompts to
frustrate the hacker into quitting early.
The most common defense is allowing only a few login attempts before
disconnecting. The computer may then refuse to allow a reconnection within a
certain period of time. The drawback to this is that a legitimate user might be
inconvenienced - though having to wait a few minutes is much less of an
inconvenience than logging on to find one's files have been tampered with by some
cracker.
Another method is to increasingly slow the re-sponse time to each successive login
attempt. A prospective hacker might find himself waiting thirty seconds for a
response from the remote com-puter... Then a minute... Then two minutes... The
long waiting periods wouldn't start until the first three or four login attempts were
tried and found unsuccessful. Then the computer would say to it-self, "Gosh, no
real user would spell his name wrong that many times. Must be a hacker!"
Another trick is the dummy login prompt. After a certain number of unsuccessful
login attempts the system continues asking for login information, but returns an
error message no- matter what the input is.
The moral of this story is, if you write a pass-word-cracking program, be sure you
monitor its progress. Don't just set it to run overnight and leave it unless you've
first determined that such security measures are not in place. When you wake up
the next morning you may find it's been taking forty minutes for the computer to
respond to your inputs. Or you may find that every possible combi-nation has been
tried to no avail, and so you know that you've been wasting time responding to
dummy login prompts.
Conclusion
Much of this chapter has focused on different"likely" passwords to try when
initializing an educated bruteforce attack. We can go on forever list-ing common
passwords - names of pets, historical dates, room numbers " book titles - not to
mention all of the above with vowels removed, backwards, and in various anagram
forms. There comes a time when you have to forget about trying to limit the
number of possiblepasswords to a select few, because your "limited" number will be
as infinite as before you put the restrictions in place. Besides, a password may be
"easily guessable" and yet be secure enough to thwart your attempts to guess it.
The password "Smith" is not secure, and "Jones" is not secure, but"Smith@#Jones"
is as ob-scure as anything. Outsiders see password guess-ing as a valiant pastime
for the hacker, but in es-sence it is only the beginning of the hack. Brute force is
best carried out by computers, and should really only be used when a computer is
necessary to gain access (I'm thinking about Robert Morris Jr.'s worm program as
an example).The thing is, the whole business of hacking has to do with skill and
knowledge. Brute forcing pass-words requires little of either. But no one's going to
look down on a hacker who does some educated brute force work, especially if that
hacker has a good reason for doing so. But don't rely on the computer's brawn to
do your dirty work: Use the ingenious computing power of your
brain. And that is the topic of the following two chapters.
48

"Computer crimes deal with people to a far greater degree than they deal with
technology.
Donn B. Parker
Chapter Five:
Social Engineering
It is somehow shocking the first time one hears about "social engineering." At least
it was shocking for me. Hacking is thought of as an ac-tivity pursued solely,
nocturnally, relentlessly, for hour after midnight hour, by some dazed and nerdish
character banging away at a computer keyboard in feverish pursuit of that single
golden word which will grant access to the technological secrets of the universe.
That is how it was at some point in the past, until it became impractical. Those
brute force methods are certainly valid, and they are the bread and butter of any
well-stocked hacker's arsenal. But there are other ways to learn pass-words; social
engineering is one of them.
"Social engineering" is the attempt to talk a lawful user of the system into revealing
all that is necessary to break through the security barri-ers. The alternate term for
this is "bullshitting the operator."
Social Engineering (SE) appears in a variety of forms and disguises. Here I will list
many of them. As you will surely discover for yourself, there is a cornucopia of
clever twists and vari-ations to be made on each of these examples. Some twists I
will examine, others will be left for you to creatively imagine.
The Noble Form
To those hackers whose sense of ethics does not allow them to use trickery in an
attempt to ascertain passwords, one form of social engi-neering still might be used
without straying from one's sense of morality: the gentle art of asking, "Please ... ?"
I think I've never heard of a verifiable instance where this has worked, though
there are rumors that hackers have simply requested -and received - passwords
from system users. Usually, the story goes, the system operator is either asked
over the telephone, or e-mailed a letter which says something like: "I am a hacker.
Give me a low access account and I will use my skills to show you what your
system's weak-nesses are. That way you can correct them and won't be troubled
by malicious crackers in the future."
49
The other way to do this is to call up some-one - anyone - a secretary in an office
for in-stance -1 and just ask, "What do you type in to start the computer in the
morning?" Will this work? Well, you would have to be lucky enough to call someone
who's fed up with his or her job, and who doesn't know any better about security
procedures.
Social engineering minus the deceit is not likely to work, and could make it harder
for you to get in, in the future. More likely you will want to bone up on your acting
skills and try some telephone shenanigans.
Hacker As Neophyte
Here you play the role of a new user. Let's say you're trying to get into a
company's com-puter system. The time is 8:55 in the morning. You call up the

computer department (from your home or wherever) and this is the conver-sation
that follows:
PERSON ON OTHER END: "Hello; Jack Chipper, Computing Department. "
YOU: 'Hello, Jack, this is Gary Harris from the Researching Department. Maybe
you could help me
with a problem?'
JACK: 'Maybe... What is it?"
YOU: "Well I'm the first one here, and I can't seem
to get things started up. Will you talk me through it?"
JACK: 'Sure. You by your computer?"
YOU: 'Yes."
JACK: 'Okay. Turn on the red switch on the floor.
You see it there?'
YOU: 'Yes, okay. I see it... Okay.
JACK: 'It'll take a few minutes for everything to boot up.'
YOU: "To what?"
JACK: 'Uh, boot up. I mean, it'll take a minute or two for the computer to set
itself, to get ready to use.
YOU: "Okay, it stopped.
JACK: 'What do you see?
YOU: "Just what you always see. It worked up to
here fine before, but after this, it didn't work. What do I do when it
doesn't work here?
JACK: "What do you usually type?"
YOU: 'I don't know. This is my first day here. I'm just a temp - they said
someone would tell me!
JACK: 'Okay, press Enter.
YOU: "Enter... Okay.
JACK: 'Now type 'TEMP'spacebar 'PUPPY."'
YOU: "Okay... Oh!"
JACK: "See?

YOU: "Thank you, lack - I don't know what went wrong before!'
Now I want to run through this conversation again, this time pointing out some of
the essential components of all successful social engi-neers.
PERSON ON OTHER END: "Hello; lack Chipper, Computing Department. "
YOU: "Hello, lack, this is Gary Harris from the Researching Department.
Notice here, how you begin your conversa-tion by mimicking the technician's words,
intro-ducing yourself in a way similar to the way the technician introduced him or
herself. This is done to make the person on the other end feel more comfortable
talking to you, and to show that you're not afraid to reveal who you are or what
business you do for the company.
50
If Jack had said he was from the Computer Room, then you would say you were
from the Research Room. Unless you have a company di-rectory as reference, you
won't know the exact names insiders use for each of the various seg-ments of the
corporation. Thus, it's usually a safe bet to talk like the insider in this case, the
technician. Even if you say "department" when you should have said "committee"
or "room," the fact that the technician used that term will make you sound, in his
ears, like an employee.
YOU: "Maybe you could help me with a problem?
This appeals to the technician's sense of computer godliness. Also piques his
curiosity as to what could be wrong with his system, or your use of his system.
Saying "maybe" will get the technician somewhat flustered - you should know
better than to question his ability to han-dle computers. He will then go overboard
to show you how smart he is. Knowledgeable users love to show off their
computing skills (I know I do, don't you?), especially technicians whose job it is to
help the multitude of non-experts get through the day.
Also, notice the mention of the word problem." Computer people love solving prob-
lems. Mention in a vague way that there's a problem with his system, and he'll go
crazy: just open your ears and let the passwords roll right in!
YOU: "Well I'm thefirst one here...
Notice at the beginning I mentioned that the
time was 8:55 in the morning. It won't always be possible to call before the
workday begins, but it sure does help if you can. Doing so gives you a valid excuse
to call a technician for help; after all, if you're the first one there, there's nobody
else to ask. But technicians won't always be available before anyone else at the
office, so this won't always work.
Consequently, you may want to try making a phone call at the end of the workday.
Then you'll be able to say that the other people in the office shut off the computers
and went home be-fore you had a chance to finish your work.
YOU: "...and I can't seem to get things started up.

Will you talk me through it?
Now that he knows he's the superhero, you immediately identify the problem, while
still being vague enough to not alert suspicion if your assumptions about the login
procedures are wrong. After all, dialing into the company's computer system from
your house could look very different from actually being there, using it in person.
You're better off staying with general questions, and allowing the technician to
men-tally picture the specifics of your trouble. The will you talk me through it?"
request begs him to do something he does by rote every day.
Again, it is important to request that he do something specific (such as talk you
through the setup procedures) but not so specific that you blow your cover by
making yourself seem suspiciously knowledgeable. For example, if you had simply
said, "Can you help me?" he might want to walk over to your office to help you out.
Since you are not actually in an office, this will definitely tip him off to your deceit.
JACK: "Okay. Turn on the red switch on the floor. You see it there?"
YOU: "Yes, okay. I see it... Okay."
You have to pretend to be doing what the
technician asks you to do, because remember you're not actually in the office, and
perhaps the reason you are social engineering is because you don't even have a
dial-in number. It's good to have an actual computer next to you, so he or she can
hear the power being turned on and you clicking away at the keyboard.
JACK: "It'll take a few minutes for everything to boot up.
YOU: 'To what?"
JACK: "Uh, boot up. I mean, it'll take a minute or
twofor the computer to set itself, to get ready to use."
YOU: "Okay, it stopped.
51
"To what?" shows your complete helplessness when it comes to computers. You
don't want to pretend you've been living in a cave the last three decades, however.
Saying, "What's a keyboard?" will only provoke utter disbelief, not sympathy for
your naivet6.
Don't forget that the conversation has a plan to it - you're trying to steer the
conversation to your benefit, so make sure you stay in control of where it's heading.
"Okay, it stopped," reassures the technician that the computer is working fine, and
that his or her ability to give instructions over the phone has not faltered. But
above all, it keeps you on track so the conversation can con-tinue toward its
ultimate reward.
JACK: 'What do you see?'
YOU: "Just what you always see. It worked up to
herefine before, but after this, it didn't work. What do I do when it doesn't work
here?'

JACK: "What do you usually type?"
YOU: 'I don't know. This is my first day here. I'm
just a temp - they said someone would tell me!"
Boy! This guy isn't letting up! You can either
try for another generic answer ("Usually I type my password here..."), but what if
you guess wrong? What if at this point an office worker is placed at the DOS
prompt or Macintosh Desk-top? You see, it could be that dial-in lines are password
protected while in-house computers are not. In-house computers might be
protected by trust, physical keys, or biometric devices.
In this instance, you've used the "new per-son" ploy. It's usually a good bet to
pretend you're a new person, unless it's widely known that the company is actively
firing employees, or is ready to go bankrupt. Saying you're from a temporary
agency may or may not be a good idea. Temps will generally have a site contact or
local supervisor to whom they report and ask questions. The technician might not
know that, however, and in any case you can always say that your supervisor is in a
meeting and told you to call the computer department for advice.
JACK: 'Okay, press Enter.'
YOU: 'Enter... Okay.'
JACK: "Now type 'TEMP'spacebar 'PUPPY.
YOU: "Okay... Oh!"
JACK: "See?"
YOU: "Thank you, lack - I don't know what went wrong before!
The "Okay..." is said as if you've tried this same thing a million times, but it's never
worked. Thank the technician profusely for his help, and reassure him that you are
a genuinely naive but responsible member of the company (in this case, by saying
you don't understand what went wrong before).
I based this sample script on hundreds of real-life conversations that technicians
have with legitimate users who have the similar problems. I can recall dozens of
times when I personally have been asked how to do some-thing that the user has'
already done before, without getting it to work. Usually all it takes is a run-through
and everything works fine. My experience has been that these calls usually end
with the person who has been helped grouchily saying, "But I tried that before! It
didn't work be-fore!" So make sure that you are nice to your technician - you may
be needing help from him or her again and it will certainly boost his or her ego to
know you appreciate the help you have received.
Here's another example of how a hacker can pretend to be helpless when it comes
to comput-ers, but still make off with vital information. When a new computer
system has been installed in an office, there will often be business cards or phone
numbers taped near the terminals which are used to contact someone from the
technical department of the company which supplied the computers, to deal with
bugs that haven't yet been worked out.

The business cards (or you may just find a phone number on a slip of paper) may
also be taped to a section of wall devoted to important
52
messages, or they may also be hidden someplace behind a clerk's desk or counter.
Crane your neck if you must to get the name and number off the card (or simply
ask the person, we don't al-ways have to do everything on the sly!).
Let's say you managed to get Frank Smith's number at Corny Computing while you
were doing some business at a branch of an insurance company. Call the number
and say, "Hi, this is Lauren from Booboo, Insurance. There was some weird stuff
going on with the computers and I had to shut them off, and now I'm stuck...... And
let them lead the way.
One time I saw such a business card taped to a public access terminal at a library.
I copied off the information, then called up, saying, "This is Jack [a guy named Jack
really worked at the li-brary] from Whoopie Library. I'm having trouble getting into
the circulation system from public access mode. The computer's behind the
counter, so I don't know what it was doing in PA mode to begin with, but..."
Hacker In Power
If appealing to a technician's sense of godli-ness won't work in your situation,
perhaps it's time to become a god. In a military setting, pre-tending to be a high
ranking officer can put fear into the hearts of any lowly receptionist. Just call up,
saying either that you are the general, or you're the general's personal secretary.
In either case, both of you are pissed off that your computer isn't starting up the
way it should. Demand to know why your account isn't being accepted as valid.
Don't whine or complain just make angry demands. You will get results.
In a corporate milieu, pretend to be the CEO or the president, or secretary of a CEO
or presi-dent, especially in organizations where it is well known that the leader is a
hothead. No one wants to get fired or demoted. The anger routine is useful
because the person who picks up will want to be rid of you as fast as possible, and
will do anything to get you off his or her back.
Presidents, leaders, military officers, CEOs and the like, don't have to be angry,
however. Just the mention that you are whoever you say you are will work wonders
for your credibility (who else would possibly dare to proclaim themselves General
So-And-So?). But if you act as a high-up without being angry, make sure you've
done your research beforehand and know what your name is.
This is a sample encounter:
PERSON ON OTHER END: "Good afternoo -
YOU: "THIS IS GENERAL FROBBS. I AM AP-PALLED BY THE CAVALIER WAY IN
WHICH THIS
PLACE IS BEING RUN! I WENT AWAY FOR TWO DAYS AND WHEN I
RETURN I FIND I HAVE
BEEN ERASED FROM THE COM-PUTER! WHO'S IN CHARGE OF THESE
COMPUTERS? I'M
APPALLED! I DEMAND YOU RESTORE MY ACCOUNT. I HAD MANY IM-
PORTANT
DOCUMENTS SAVED THERE!"

PERSON ON OTHER END: "Did you try typing 'GROUP.1,' 'SEC'? That still works.'
YOU: "THAT'S THE DAMNED GROUP CODES! I NEED MY OWN PERSONAL
ACCOUNT BACK! I
AM APPALLED!
PERSON ON OTHER END: 'I'm sorry, I can't help you with your own codes. Would
you like me to find
someone who can?
Notice in this example conversation you have managed to procure a
usemame/password combination which, while not too powerful, at least will gain
you access. Even if the person on the other end never does manage to find the
general's password, at least you've ended up with not just one, but several accesses
to the sys-tem. After all, if there's a GROUPA, there must be a GROUP-2, right?
Hacker As Helper
This type of role playing is like reverse social engineering without the sabotage (see
next chapter). Here you pretend that something has gone wrong with a place's
computers, and you are the technician who is calling to fix it.
53
Let's say you want to break into the computers at the mayor's office. You call up
his secre-tary, and you say something like this:
"Hello, this is Jake McConnel from Computers. We were wondering, have you been
having any problems with the computer system? "
Of course she's been having some sort of problem with it - there's always some
problem
with computers!
The secretary answers: 'Why yes! First this was happening, then blah blah blah...'
You say, "Yes! That's exactly it! That wasn't your fault - there's something wrong
with the computers, and we're having troublefixing it. When you first turn on the
computer, what do you type in to get it started? One of the other guys here was
screwing things around last night and we think that has something to do with it. "
The secretary will not be suspicious; after all, you've identified yourself. Even if
you hadn't, what harm could possibly come from telling someone a password over
the phone? You see, the secretary, or any other underpaid, over-worked, menial
user of the system, is a very weak link in the chain of security. The secretary
doesn't understand computers and doesn't want to. All she knows is something's
going wrong and you're going to fix it for her. This is a very effective ploy.
Peak Hours
Don't use the above mentioned sort of ploy around lunch time or early in the
morning. It'll be harder to work effectively. Let the ressures of the work day start
to pile up before you call.
If the system you're breaking into is a place you have access to, such as a library,
dentist's office, bank or school, you should do a little re-search and figure out when
the best time is to make your call.

At one of the libraries I belong to, the com-puter system has a "3 o'clock slow
down." At around 3 o'clock every afternoon, the computers suddenly slow down to
half their usual speed. This leads to various other computer problems and,
ultimately, very frustrated library workers. I don't know why the computers slow
down; maybe the system gets the most use at 3 o'clock, or maybe at that time
information is forced to travel through an alternate route to get from the library's
terminals to the mainframe located at a college on the other side of town. If I were
to try some social engineering on the library, I would do it during the 3 o'clock slow
down, when most problems occur.
I've noticed another thing: The library pa-trons who don't realize that there's
nothing wrong with computers (who don't know that they always slow down around
that time) call up the "computer roomit at the college and ask why their computers
are down. Don't you think it would be a pleasant surprise, if one day they got a call
from the "computer room" (i.e., me or you), asking if there's anything we could do
to help? Surely they'd be more than willing to tell you the logon procedures they
use, if only you'd speed up the system for them!
Computers tend to be at their slowest to-ward the middle to end of the day, when
the most people are on the network. Especially in university settings, this is true.
Frequently stu-dents and faculty will log on in the morning, then stay connected
throughout the day, regard-less of whether they're using the system. On the other
hand, some systems will actually getfaster as the day proceeds, so research is
always a must. For example, the Prodigy service is proud of the fact that toward
the end of the day and into the night, as usage increases, system speed also
increases. This is because data is stored on a dual-tier basis. There are the
mainframes situ-ated in Prodigy headquarters somewhere on the globe, and various
minicomputers scattered about the country. Users connect to the semi-local
minicomputers, called Local Site Con-trollers, and as they use the system, data is
cop-ied from the far away mainframes, to the local minis. By the end of the day,
most of the data a user would request to view will have already been transferred to
the closer computer, making for less waiting time.
It's good to be aware of pace trends in the places you intend to social engineer. If
you can find a noticeable difference in pace (like a 3 o'clock slow down) naturally
you will want to work your magic around that time. Good times don't have to just
be when the computer changes pace; if the workload, noise-level, number of
54
customers, or some other aggravating condition worsens during a particular time,
that is gener-ally a nice time to social engineer. To find these times, try to visit
your target's office at various times throughout the day. Find out when the office is
busiest. If it's something like a library or travel agency, go visit the building or
make some phone calls. Ask a question about some-thing, and if they seem to be
having trouble when they look it up in the computer, call back as the guy from the
computer department. Re-member, offices will be at their most hectic after being
closed one or two days, so Monday morning is always a good shot. Just make sure
they're not so busy that they don't have time to schmooze on the phone with you.
Social engineering will work with any com-puter system, of course, but you will
naturally find it a lot more difficult to fool a system ad-ministrator at the
community college, than a teenage bank teller. Social engineering has been
successfully used to gain access to corporate networks, schools, government
offices, and other systems. Social engineering is a powerful tool, but you have to
be a good actor to use it prop-erly.

Other Hints
If it's possible to research the place, do so be-forehand. Do as much as you can to
find out about busy hours and what kinds of problems they might experience with
the system. If it's a public place like a library, for example, then try to figure out
which people working there know nothing about computers. Try to get those peo-
ple on the phone. Also, make sure you identify yourself as so-and-so from the
computer de-partment (or computer division, or section; if the person answers the
phone, "Hello, registration office," then use the same terminology - com-puter
office). And when you do so, use a com-mon, everyday first name, and also a
familiar last. If you can't get the login information the first time, try again at a
different time, on a dif-ferent day. Don't speak to the same person, however.
A friend of mine, Bill, told me this story. One summer day he called up a mail order
place to
buy some electronics equipment. As the woman was taking his order, she casually
mentioned that she was doing everything by hand because the computers were
down. Bill asked if she knew why they were down. She said she didn't know, but
she was pissed about it because com-puters in other parts of the building were
working fine. Well, as soon as Bill got off the phone, he called back and hearing a
different operator on the line, proceeded to have this con-versation:
OPERATOR: 'Shark's Radio Supplies, Pam speak-ing. May I help you?"
BILL: "Yes but actually I called to help you. This is Bill Robinson, in the computer
department. Are
you still having problems with the computers?'
OPERATOR: 'We sure are!"
BILL: 'Oh, okay. What's the computer showing right now?"
OPERATOR: "Nothing, we have them all turned Off. "
BILL: "Oh I see. I thought you were having problems with it, but I guess you're in
the part of the
building where they're not working at all.
OPERATOR: "Yeah."
BILL: "Well, have you tried turning them on lately?
OPERATOR: "No - oh, are they back on again?
BILL: 'I think they might be. Now would be a good time to try."
OPERATOR: "Okay.... Nothing came on the screen.'
BILL: "Can you type in anything?'
OPERATOR: "Lemme see.... No.

55
BILL: "Sometimes, even if it doesn't look like the letters are going to the screen,
they still go there. Try typing in all the stuff you usually type in when you first turn
on the computer.
OPERATOR: "Okay.
The operator went on to give Bill all the in-formation he needed to know. When the
opera-tor was finished "logging on," Bill gave a re-signed sigh and said, "Oh well, it
was worth a shot. I'll go back and tinker around some more. Thanks anyway." Of
course, he still didn't have a phone number to call. He didn't even know if the
computer system was connected to outside lines - after all, this all happened on
account of a freak accident, his finding out about the downed computers. But now
he knew how to go about logging in to Shark Radio Supplies's com-puter system,
and he had made a friend on the inside. The login information was important in
case he did find a phone number, or if another hacker needed the information.
Having an in-side friend was important because now Bill could use her as a further
information source, if the need ever arose.
Sample Social Engineering Situations
It's easy to get yourself into awkward situ-ations, especially at the beginning of
your social engineering career. You will speak to reception-ists and other company
insiders who know the lingo, know policies and screen setups, and know how to
spot a fake. Whether intentional or not, you will be asked questions to which the
answers are not readily apparent, due to the fact you are an impostor. Here are
some samples" and possible solutions.
RECEPTIONIST: "You're Charles Green? But there is no Mr. Green in our
computing department. "
YOUR RESPONSE: 'I've just been here a few days- "
RECEPTIONIST: 'That's funny, I didn't see your picture hanging up on the New
Staff bulletin board. "
YOUR RESPONSE: 'Yes, I know. What's-her-name hasn't had a chance to take my
picture yet. Maybe
later today.
RECEPTIONIST: "What do you mean, 'What's-HER-name'? lack's the one who
takes staff pictures.
YOUR RESPONSE: "Oh yeah, Jack -right!"
RECEPTIONIST: "I won't be able to help you until I have your staff ID. What is
your employee ID num
ber, please?'
YOUR RESPONSE: "Oh, I don't have one. I'm just a temp. I'm filling in for
someone who went off to have a

baby.'
RECEPTIONIST: "Just read the number off your ID badge.
YOUR RESPONSE: "I didn't get my badge yet there was some mix-up or something.
My supervisor said
she would give it to me tomorrow, maybe. You know how it is, no
one knows what
they're doing, and all that..."
RECEPTIONIST: "Who's your boss/supervisor/manager?
YOUR RESPONSE: "M______,Do you know any-thing about him1her? "
(You should've done your research, so you should know the answer to this sort of
question. If you don't know and it's a large company, or a large building, you can
try either answering with a false but common name, or try the old, "Uhm....
Something with an 'S' - Schindler? Schindling? Schiffer? Schifrin?")
Here's a different situation:
RECEPTIONIST: "But I don't have a computer!"
YOUR RESPONSE: 'I'm sorry. I must've dialed wrong. Is M- available? '
(M_______,is the name of the receptionist's boss.)
56
If you can manage to work in some company news or personal tidbits in an
unobtrusive way, then do
so- if the person you're speaking to seems friendly. This is just another way of
gaining credibility points.
YOU: "Sorry, I didn't hear that last thing you said. It's really loud here with that
construction they're
doing next door."
YOU:"By the way, does M have a kid in the Little League? My son has a friend
named
Note that for maximum benefit, credibility questions, should be worked in before
asking about login procedures.
Miscellaneous Social Engineering Tips
To improve your chances of getting in with social engineering, here are some tips.
Notice how the person you speak to reacts to your questions. If you speak to a
receptionist or other worker on the bottom of the pay ladder, he or she may not
want to chit chat or fool around with computers if he or she's being monitored, or if
calls are being screened by the boss.

Go to some public place where they have terminals hooked up, and look at the wall
where the terminal is connected to the phone box. Write down the four digits that
appear on the box (these are the last four digits of the phone line that the terminal
is hooked to). Guess the first three digits of the number by looking at a directory
for the "public place" in question. Call a couple times at different times of day to
make sure the line is always busy. Keep some of these "leased line" phone
numbers handy when you social engineer to give to people who want to call you
back. This is especially true of sysops who suspect you're a hacker and want to see
if you're brave enough to give them personal identification information about
yourself. This is better than just making up a phone number out of thin air,
because if they do call up, the busy signal will at least create some reassurance in
their mind that you weren't a complete fake.
Just giving them a number will usually relax them enough so they feel you are one
to be trusted.
Confront people in a lighthearted way when they give you a password. Say, "Are
you sure that's really the one you use?" Secretaries may have two passwords. One
is their own, which grants them access to a low-level group account. The other is
their boss's password, a higher level one that they know about because, frankly,
sec-retaries know everything about an organization.
Challenging someone in a non-accusatory way about the password you are given
may also cause them to fess up if they had indeed given you an invalid password to
get you off their backs. Second guessing them shows that you al-ready knew the
correct password, and that you caught them in a lie.
If they are bewildered when you ask for a higher password, just say, "Didn't they
upgrade your access yet? They just bought this whole new system that's supposed
to work fifty times faster and everyone's saying how wonderful it is...... Then
quickly change the subject.
Have a background tape playing with office sounds or whatever is appropriate for
the num-ber you call. Before using this tape, try to take a tour of the company and
listen to the real sounds made during the work day. Also, play the tape for a friend
over the telephone, and similarly have a friend play the tape while you listen over
the phone - trying to adjust the tape to a realistic sound level. Remember that if
you're the "first one in the office" as with our naive user example, you don't want
the tape to include background chatter or typing!
When you're talking to people, even if it's just over the telephone, keep a smile on
your face and act in a jovial, friendly manner. Pretend you're that person's best
friend. If the person picks up the phone with a, "Hello, General Widgit Corporation,
Lulu speaking," you re-spond with, "Hi Lulu! This is..." and go on with your spiel.
Now Lulu doesn't know if you two have met before, and as you continue with your
friendly attitude, she will begin to treat you more like a friend. Try looking through
some books on voice marketing, telephone selling, etc., to get more ideas.
57
The way in which your phone call is re-ceived can also affect your credibility. Often
a company telephone will make a different sort of ring, depending on whether the
caller is on an inside or outside line. Since you are pretending to be an inside
caller, you will want your tele-phone ring to reflect that. To fix that, call a wrong
office or department in the company, and have them transfer you to the number
you're after. For instance:
PERSON ON OTHER END: "Advertising. May I help you?"

YOU:"I'm sorry, I guess I dialed wrong. Would you mind transferring me to
extension 4358?
Now you'll get that in-house ring, and with it, an air of authority (and maybe even a
special inside caller light will flash on the telephone, too).
Another way to get that desirable inside caller ring/light is to dial, not the listed
number, but one next to it. Any organization with more than one phone line almost
certainly owns a block of phone numbers. So if the listed number to call is 123-
4567, try calling 123-4568, or some-thing a few digits higher or lower. Your call
will usually go through, and it will take on the clout of having been placed by
someone who is ap-parently a company insider - anyone else would have dialed the
listed number.
Another thing to consider is if you're trying to reach a higher-up in the corporation,
you may only end up contacting secretaries, receptionists and/or other underlings.
A good trick is to call an office of higher or similar prestige as your goal office, and
let the secretary transfer you over. For example, suppose I want to try social
engineering Mr. Palooka - a middle manager who runs the shoe division. But I can't
get through to speak with him personally. What I do is, I call up Mrs. Colt, who is
either a same-level, or higher-level manager, and I ask her secretary to connect me
with Colt person-ally. Colt's secretary asks what I wish to speak to Colt in
reference to, and I say, "Shoes!" But Mrs. Colt handles only the rubber band
accounts, not shoes. So Colt's secretary says, "Well, you'll have
to speak to Mr. Palooka about that one; would you like me to connect you?" She will
then trans-fer your call to Mr. Palooka's secretary. Pa-looka's secretary comes on
the line, and you say to her, "Hello. This is so-and-so. Mrs. Colt's of-fice suggested
I speak with Mr. Palooka about shoes." Here you have a recommendation from
another company member! You're now much more likely to get in to bullshit Mr.
Palooka. Happy engineering!
Other Roles
Social engineering in its most important sense refers to the obtaining of personal or
group passwords by making up a story about yourself and role playing it, hoping
that who-ever you end up speaking to will play along. But the goal of social
engineering doesn't just have to be passwords. And the method of engineering
doesn't just have to be over the telephone. Con-versations may take place in
person or through the mail. The first requires strong nerves and greater acting
ability. The second is more suited to those who find it difficult to ad lib telephone
SE conversations.
In-Person Engineering
Any instance of impersonation is a form of social engineering. The impersonation
may be of an individual person (the president of a com-pany who demands to know
why his password isn't working) or of a generic person Gill Tech-rucian, calling to
ask if any computer problems have come up). The telephone is normally used
because it enables a hacker to reach distant businesses without travel, as well as
creating a defensive barrier between the hacker and the people he or she calls. If
the conversation starts to go sour, a telephone can be hung up; if a face-to-face
talk gets out of hand, it could be dif-ficult to get out of the building.

A good rule of thumb when doing in-person social engineering is to always wear a
suit - a good suit, one that fits properly. Make yourself look like you just stepped
out of a fashion magazine. At the very least, wear a shirt and tie. Females, wear
suitable business attire
58
Many kinds of SE that work over the phone, won't work in person. You can't
pretend to have an office, or pretend to have a computer termi-nal. Because of this
the information you get from bullshitting in person may be minimal or only
peripheral. You will probably end up with more background material than
immediately useful information.
Pretending to be interested in wanting a job at the firm, or going on a tour of the
place, or simply squeezing in and wandering around on your own, provide lots of
good data on how employees interact among themselves. Hackers and crackers
have also impersonated mainte-nance workers, painters, and other workers to get
inside a company. Being a security guard is also a nice ruse.
The prototypical in-person social engineer is the survey taker. You make up a
survey, and stand in the lobby of the building with a pen and clipboard, and get
people passing by to fill one out for you. The survey asks for name, spouse's name,
hobbies, pets and pets' names, and similar info. Then you go home and try all that
stuff as passwords. You might want to say there's some prize involved. For
example, that completely filled out forms will be entered in a raffle; winners get
tickets to a local show, or a free meal at a nearby restaurant. (Hint: Don't ask
people to fill out surveys in the morning when they're late getting to work.)
Written Engineering
Social engineering may be done through the mail or through other forms of written
contact with users of a system. For example, the survey method can be altered
such that the human ele-ment is eliminated. If you don't want to wait around in a
lobby all day, just leave out stacks of the forms with either a drop-box or an
address to mail them to. Expect minimal response.
Other written ruses take the form of adver-tisements. Put up a notice in a
computer room, saying that paid volunteers are needed for a special project.
"Become a System Manager' Great Experience!" Have interested folks mail you a
post card with their name, address, de-sired password, and possibly the machines
they
currently have access to on the net. While mak-ing the ads you'll say to yourself,
"Sheesh! This is so obvious!" But you won't believe how many people fall for it.
Have them address the post-cards to something like "X University, Computer
Science Department, Roger Hamm's Office" fol-lowed by your address. If your
address is thirty miles away from the university, forget about it.
Two Manhattan hackers tried this stunt. They noticed there was a blank space at
the bot-tom of a particular magazine advertisement for one of the popular pay-for-
play information sys-tems. They went to local area libraries and bor-rowed all
magazines they could find that had this ad in it. Using a "sideways printing" utility,
they fed the pages into their printer, which printed out, "Manhattan Area Residents,
Call [phone number] For Free Six Month Member-ship." Then they returned the
magazines to the library.
When people called them up, they would begin by playing a corny recorded
message: "Welcome to X-Net's Free Six Month Member-ship Program! Listen to all

these great things you can do with X-Net ... !" When that was done, one of the
hackers would come on and ask the caller a few questions: "Where did you hear
about this program?" "Have you ever subscribed to X-Net in the past?" "What other
fee-based bulletin boards, or other computer networks do you belong to?" "When
you call up X-Net, what would you like your sign-in name to be?" "And your secret
password?" "Are you sure you're going to remember that password? Perhaps you'd
like to choose something else?"
In this way, they ended up with a dozen names, computers they visited, and one or
two passwords to try out. You won't get as big a response if you don't live in a big
city, but it's worth a shot. Advertising can also be done by slipping a printed card
into the magazine, or by advertising on BBSs.
A similar ruse is to advertise your phone number as a local call switcher, especially
in places where there isn't already a Telenet or Tymnet link. When users log on
they will see what appears to be the usual opening screen, but is in reality a
simulation which you programmed. From hacking, you should be familiar with
which networks have which addresses, so
59
your program can simulate appropriate login screens for each of them that a caller
might try. (Otherwise, respond with a message like, "Line is busy" or "Connection
can not be established." Look at actual call switchers, to see not only what
messages are displayed, but to get the timing down right.)
After "connecting" to a computer or network, the program continues its simulation,
collects the user's name and password, then aborts due to erratic line noise or some
other ghastly prob-lem. If the user tries calling back immediately, a message can
be put up that warns certain transmission routes are undergoing mainte-nance, or
similar baloney.
Request For Information
And now, back to some pure social engineer-ing through the mails...
Scan all the computer mags and journals fu-riously, even the bad ones, for
warnings about product failures and security loopholes. Journal-istic morality
generally prevents dangerous se-crets from making their way to the mass media,
so the exact details of system security failings won't make it to print. You'll see
things like, "Four hackers were caught yesterday, after ex-ploiting a loophole in the
V software on the W machine at X Military Base." Or you'll see things like,
"Company Y has released a warning about its Component Z, which is supposed to
keep unauthorized users from penetrating a system......
What you do is, go print yourself up some official looking stationery, mail a
concerned let-ter to the folks at the company, and wait for their speedy reply. You
can try the annoyed approach:
Dear Mr. Abel Jones:
It has come to my attention that there are serious shortcomings in your product,
Component Z.
My business operates under the assumption that our data is secure because of
Component Z.

Seeing as how we have been misled for six years, I expect either: details on the
flaws which inhibit Component Z, or reimbursement for six years of twelve non-
functioning Component Zs, the cost of which amounts to $14,000.
I expect a quick reply.
Or the "Let's work together to make this world a better place to live in," approach:
Dear Mr. Abel Jones:
I was dismayed to read in Friday's edition of Computer Magazine that your
Component Z is defective.
My business uses twelve of these devices, and I would regret very much if we
experienced a data loss due to their not working.
Please send an explanation of the problem in the enclosed envelope, so that my
technicians may remedy the problem as soon as possible.
Thank you for your help.
Sincerely,
I'm divided as to whether or not you should mention specific threats in your letter
to the company or organization. On one hand, you don't want them to suspect your
letter is phony. But on the other hand, they're going to be receiv-ing many letters
similar to yours, most of which are legitimate. You shouldn't have any problem as
long as you type the letter on good quality paper, with either a real or imagined
letterhead on top. For added effect, type the address on the envelope, and instead
of stamping it, run it through a postage meter. You may also slip in a business card
of your own design; they are cheap to obtain.
If the company refuses to help you without proof of purchase, well then, you're on
your own. You can always try to social engineer the company technicians into
revealing the security flaws. There are also plenty of computer security
associations, organizations and other groups which will have the particulars of the
loophole.
60
You might also make an attempt to get the juicy details by calling the publication in
which you read about the security failing. Try to speak to the person who reported
the story. People at magazines and newspapers are surprisingly easy to reach on
the phone, but getting them to talk is a different matter!
Message From God
Dear User:
This is most embarrassing.
As the director of PinkyLink, America's largest on-line information service, I was
shocked to discover that a theft of several backup tapes took place over the July
6th weekend.
Contained on one of those tapes was, among other things, the personal security
data on a small percentage of our customers.

While your name was, luckily, not on that stolen tape, there is still some threat to
you. As of now we are uncertain whether any users with programmer-level
computer access were backed up on the stolen tape. Therefore, we request you fill
out this application and mail it back immediately in the postage paid envelope
provided.
Fill out the form and return it to us as soon as possible. Once received, we will
update you to this new, secure ID.
Thank you for your cooperation, and to offset any trouble this may cause you, we
will be subtracting 75% off your August bill.
Name
Address
Zip
Day Phone(_)
Night Phone(_)..-
Old (Invalid) Password
New (Updated) Password
PinkyLink, America's Largest On-Line Information Service, guarantees that the
above personal data will be inputted no later than September 1, 19--, (following
verification), and will be kept confidential before and after such time.
Please keep a copy of this for your records.
Imagine Joe User gets this letter in the mail. It looks authentic, having the logo
and letterhead of the service, and arriving in a metered, typed en-velope. But will
Joe believe that PinkyLink actu-ally sent this to him?
The whole situation is preposterous! Any real life computer service with a password
problem would require that all password updating occur on-line. It's simply the
cheapest and easiest way to update hundreds or thousands of pieces of user
information. Still, when Joe User looks at this letter, he will notice that he isn't in
immedi-ate danger as some other users of the system are; unlike those other poor
losers who got their passwords stolen, Joe doesn't have to be con-cerned that he'll
start getting huge bills in the mail from the criminal charging system usage to Joe's
account.
And what about that 75% deal at the bottom? That makes Joe twice as likely to
respond to the letter. Not only does he have a responsibility to himself to make his
account secure again, he has a responsibility to the database: if they were nice
enough to warn him of this and pay him for it, the least he can do is comply with
them. And the return envelope is postage paid!
Of course, PinkyLink probably has an on-line way for users to change their
password, but you don't have to mention that when you write a letter like this.
Remember, the style is more important than the wording of the letter. Before you
send out something like this, be sure to look at real examples of PinkyLink's
correspondence, to get an idea of the kind of paper and printing used, sizes of
fonts, coloring, etc.

You should expect high returns from this swindle, especially if the people you send
the letters to are absolute rookies. Later we'll talk more about how monitoring BBS
activity can pay off.
61
Trouble In Paradise?
Impersonating a huge corporation, or induc-ing people to mail you their passwords
under false pretenses, can get you into big trouble. The Post Office considers such
activity postal fraud, even if you're just doing it for laughs. These ideas are
provided to stimulate your imagina-tion - not to encourage you to do anything ille-
gal. Before you go and do something stupid, you might want to read Chapter
Fourteen.
When you social engineer there are many factors that inhibit the person you speak
with from giving out security data. Consider, when you social engineer someone,
that person
• may have been warned about security leaks
• may be knowledgeable about social engi-neering tactics
• can not verify your claimed identity
• might know you are not who you claim to be
• has no reason to assist you, and can give you wrong or misleading information
• can report your call to a security manager.
For all these reasons, a person you try to social engineer may not want to or may
not be able to tell you passwords and other information that you request.
Considering the above list, would you divulge confidential information to someone
asking you for it over the telephone?
That's the problem.
The solution?
See you in the next chapter!
62
Chapter Six
Reverse Social Engineering
Reverse social engineering, or simply reverse engineering (or the simpler RSE or
simplest RE) is a sometimes risky endeavor that varies in its effectiveness and in its
applicability. However, results from RSE are so strong - and often so humorous -
that it provides a flashy alternative to other methods of breaching system security.
You see, even though social engineering is an accepted and revered method of
finding out what you shouldn't know, it has its faults. No system is perfect, and
clearly the list of flaws from the previous chapter shows that there are deficiencies
in the usefulness of social engineering.
In many respects RSE is better than SE. However, reverse SE can only be used in
specific situations and after much preparation and research. In addition, the best
reverse engineering can only be done by more sophisticated (and mobile) hackers.
Don't expect this technique to be your bread and butter as you are first introduced
to the world of computer-criminal culture. Reverse social engineering in its most

consummate forms takes information you don't yet have, and skills you may not
have acquired. Here is a comparison
chart that shows some of the pros and cons of each form.
SOCIAL: You place call, are dependent upon them.
REVERSE: They place call, are dependent upon you.
SOCIAL: You feel indebted to them, or they believe and act as if you should be.
REVERSE: They appreciate your help and concern, will oblige you in the future if
ever you need
assistance.
SOCIAL: You need help from them.
REVERSE: They need help from you.
SOCIAL: Questions often remain unresolved to the victim.
REVERSE: All problems are corrected; no suspicious loose ends.
SOCIAL: You have less control.
REVERSE: You retain complete control of the direction and subject of conversation.
63
SOCIAL: Little or no preparation required.
REVERSE: Lots of pre-planning required; previous access to the site is needed.
SOCIAL: Can work anywhere.
REVERSE: Only can be used under certain circumstances.
Much of social engineering is based on the premise that you, an impostor, pretend
to have difficulties and need assistance from another computer operator to solve
your problems.
The reverse to this is that a legitimate system user has difficulties, and he or she
asks you the hacker for
assistance. In the process of assisting the user with his or her problem, the hacker
is able to (effortlessly) find out account names, passwords -the works.
An RSE attack consists of three parts:
• Sabotage
• Advertising
• Assisting
Sabotage is an initial brief contact with an on-site computer, during which the
hacker causes a malfunction of some kind that will need correcting.
Advertising is letting the user know you are available to answer computer-related
questions.
Assisting is the conversation in which you solve the user's problem, and the user
unknowingly solves yours.
Before I explain how this is accomplished and what good it does, you should
understand why it's better to have them call you than the other way around. Let's
step through that list of bad stuff about social engineering that was given

previously, this time demonstrating how reverse social engineering overcomes all
of those problems.
Overcoming Social Engineering
Drawbacks
May Have Been Warned About Security Leaks
Or May Know About SE Tactics
Trying to social engineer someone who knows about social engineering, especially
hip programmers and other hackers, won't get you anywhere. Even if the other
party doesn't know about "SEing" per se, he or she may take "Don't
reveal the password" warnings seriously enough to see through your bull. Social
engineering is based on the premise that the person you contact is naive. You can't
always guarantee that will happen.
In RSE, the legitimate user is calling you for advice. Consequently he or she
believes you are trustworthy, a member of the company or approved by the
company, and one who already knows passwords and protocols anyway. There is
no reason not to divulge this kind of data to you. In fact, it won't even be thought
of as "divulging" since the person you speak with will just matter-of-factly spill his
or her guts to you without hesitation.
it should be noted that reverse social en-gineering is not social engineering. It
takes a backwards approach to the problem of getting users to talk, and so it won't
be recognized by a person familiar with conventional hacker tricks. Furthermore,
even if the person is so sophisticated as to understand RSE, that person will
probably be so wrapped up in his or her own problem that he or she won't notice
what's going on. He or she needs your help to correct the problem; he or she
realizes that if he or she doesn't cooperate, you won't be able to assist.
Cannot Verify Your Claimed Identity Or Might
Know You Are Not Who You Say You Are
Social engineering suffers because to the person you call, you are an enigma -
someone they do not know personally. Besides, you never know if the person on
the other end of the line has been tipped off that you are lying about your identity -
using cues such as Caller ID, a distinctive in-house tele-phone ring, or a knowledge
of employees and protocol. In any case, magic passwords might not be readily
given to "mystery technicians" and "perplexed users" with modem troubles.
BUT in reverse SE, those who know the words of passage have no reason to suspect
you of deceit: you are the one they call for advice. You are the one who is going to
help them out of their misery. In fact, when they call you, you can legitimately
request that they identify who they are. It is a matter of security, after all.
64
Has No Reason To Assist You, Or Can Give You
Wrong/Misleading Information
What does the social engineered person care whether you are helped or not? I
know if I were a busy back-stabbing office worker or receptionist in the midst of a
hectic day, I would be furious if some idiot on the phone asked me to give up a few

moments of my time to tell him things he probably shouldn't know in the first place.
I would probably just tell the caller anything to get rid of him.
On the other hand, reverse social engineers know that the people they are speaking
with require their assistance. Even the grandest guru of power users will call you if
he thinks you will be able to quickly and simply pinpoint the problem and fix it,
rather than wasting his time trying to do so. That power user knows he will get the
solution when you reveal it to him so he can solve it himself the next time it occurs.
Might Report Your Call
To A Security Manager
The trained user will know immediately when you're trying social engineering. She
can then go off and tell others about your attempted pilfering of passwords. Those
"others" include co-workers, bosses, computer managers, the person you tried to
emulate, guards, or security officers. None of this will help you get in later on,
even if it doesn't immediately get you caught or hurt your chances of penetration.
Discovery is certainly not on your list of birthday wishes.
On the other hand, reverse SEing is sure to make you a friend on the inside. When
you help people overcome obstacles, they will happily spread the word of your
courteous, efficient manner of help to others - thus spawning more calls and more
passwords.
The preceding explanations were motivated by three goals. I want you to
comprehend the reasons why even such a powerful force as classic social
engineering will fail on occasion, and how reverse social engineering can eliminate
those failings. Yet my main concern is this: Social engineering can not remain as a
mainstay of the modem hacker's bag of tricks without word getting out to ordinary
computer users. Ordinary users are becoming increasingly aware of the need for
discretion when it comes to such intimate topics as passwords and computer
security. Ordinary users are reading more in the mainstream press about how we
hackers break into systems. They are attending computer security lectures given
by their companies, their community colleges, and their local law enforcement
branches. The systems them-selves contain warnings not to reveal anything to
anyone; their employers tell them that, their conscience tells them that. I - yes,
even I - tell them that some vile people are out there trying to rifle through their
computer files.
I doubt strongly there will ever come a time when all computer users know enough
not to blab. Perhaps in a few years, businesses will have output from their
telephones on a time delay, and have them hooked up to voice monitors. Then, if a
naughty word is spoken, it can be detected and eradicated before the electrons that
compose it leave the confines of the building's wiring.
Even if such a thing does become commonplace, or even if 95% of the com-puter-
using public decide not to be bullshitted any longer by social engineers, there will
still be those five percent, the hundreds of other new and old hacking methods, and
there will still be Reverse Social Engineering to get the hacker through his day.
Reverse Social Engineering
Sabotage Methods
The first step of RSEing is to disable the target computer or the user's ability to use
that computer. Generally this means you will be disabling a user's workstation,
terminal or computer so that he or she can not access the system properly. You

want to do something that is hard to detect yet easy to correct. Here is a list of five
general ideas, ranging in the amount of setup time and system familiarity required:
• Alter a parameter, the kind of parameter that novices don't know about or think
about. Examples: default
printer port, screen colors, macros, obscure printer codes, technical peripheral
settings.
• Set files to read-only, or rename them, or make them invisible in their directories.
Example: if
65
• WP.EXE is the word processor used, change the name to WP.$A$.
• Hardware tampering. Examples: switch a color monitor to monochrome mode;
reverse disk drives;
disconnect or loosen the keyboard, or unplug the computer or surge protector.
• Install memory-clogging TSR programs. User won't know why program fails to
run.
• Run a simulation program, such as an operating system simulation, which gives
lots of ugly error
messages.
WARNING!
••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
Sabotage should not be permanently harmful to the user or the computer! Do NOT
delete files or directories: they may become unrecoverable. Do NOT install viruses:
they can easily get out of hand. Do NOT sabotage in a way such that the operating
system refuses to boot: they may not have a bootable DOS disk handy when they
call you later!
••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
RSE Case Study:
The Translation Table
A hacker and phone phreak nicknamed Phlash -because of the speed with which
he'd managed a number of great hacks - was once almost resigned to the fact that
he couldn't get any information about the computers at a particular embassy.
"They were really tight-lipped," he told me. "I tried bull-shitting them, but they
wouldn't have any of it. And line connections were hard to establish. And once on,
they only gave you two chances before disconnecting you. So I needed some other
way of getting in."
From scavenging around in the trash bins he found evidence that at least one
computer there used a particular cheapo-brand modem. Since it was his only clue,
Phlash got some literature from the modem manufacturer, and found that all their
modems came with a home-brew terminal emulator, which featured, among other
technical details, the ability to define character translation tables for both incoming
and outgoing data.

Sometimes people want to be able to press a certain key on their keyboard, but
have it come out as a different key on the computer they're connected to. For
example, a lot of times editing keys such as Backspace don't work the way they
should when you connect to a different computer, because when you press
Backspace, the remote computer ignores it. To really send a Backspace to the
remote computer, you might have to type Control-Backspace.
If your terminal program allows it, you can set up a translation table to press
Control-Backspace for you. A translation table is a file that contains each key you
can type, and the character that is to be sent through the phone lines when you
type that key. If you had this Backspace problem, you would set up your table so
that any time you pressed Backspace, the computer would translate that to Control-
Backspace, and send that to the computer on the other end of the line.
Translation tables also work the other way. They take incoming data from the
remote computer, and translate the characters into other characters. If you want
to get rid of annoying linefeeds in a file, for instance, you can set up the table so
anytime it sees a Control-J, it translates it to a null, or to a tap of the spacebar.
Phlash realized that a translation table could be used to his advantage. He took a
copy of the terminal program and composed both an incoming and outgoing
translation table, both of which were made to jumble characters. If someone were
to connect with a computer using these translation tables, nothing they typed on
the keyboard would match its on-screen output. Any data they received would be
totally garbled gibberish.
He typed up a short INSTALL program and saved it to a floppy disk. His INSTALL
program looked in the directory for the already-installed terminal program, moved
any existing translation tables to the floppy disk, and copied his newfangled tables
over.
Phlash then printed up a convincing letter from the desk of "Technology Office,
Second Branch, Director" which said, To comply with new regulations governing
cryptography, and the exchange of corn-
66
munications between ourselves and others in any foreign nation, we ask that you
install this new, more secure version of communications software which includes
functions to ensure the confidentiality of all state matters.
He gave explicit instructions for the installation, then concluded with, "Any
questions or comments should be directed toward Sr. Benjamin Marcques, at
telephone number 9-212-WXY-WXYZ." And he mailed it to a top person at the
embassy.
Weeks later he got his phone call. "Actually, they had tried calling before but I had
been away," Phlash told me later. "That poor woman went almost a week without
being able to use her modem because I did that sneaky thing to her! When she
called me, I went through the whole engineering bit, asking her to try logging on
like she usually did. Of course it didn't work. I asked her if there was anyplace
else she usually called, and there was. So we tried that. Didn't work either.
Finally I decided it was in her best interest to try going through the reinstallation
again. Naturally that reversed the four translation tables, so everything was peachy
again. Of course now I also had all I needed to get into two important government
accounts!"
Phlash said that he was getting so caught up in his pretend role that he almost
forgot to get the passwords and phone numbers. During the course of "helping" the

embassy worker, he suggested that perhaps it was a problem with the phone line:
"Which phone number are you dialing in from?"
You would also want to ask if there were any alternate numbers to try.
Unlike typical reverse engineering, this particular case involved no physical entry of
the computer site. Normally, access is needed to set up a hardware or software
problem of some sort, and to set up advertising for your unique brand of assistance.
How to gain access is touched on elsewhere in this book.
Solving The Sabotage
When they call you, after going through the login procedure and finding the error
still there, you must tell the user what he or she can do to correct the problem.
This can be done by giving explicit instructions such as: "Type 'rename WP.$A$ to
WP.EXE...... But if it is a knowledgeable user who calls you, he or she will notice
something fishy going on.
So how to get around this obstacle? You have to give instructions which will soothe
the wary user. If the sabotage is software-related, put a software solution on disk.
For example, "Go into the word processor directory and type 'SETUP' and press
Return. Now try running the program again." In this case, SETUP was a file that
you put on the disk, which contained the renaming instruction, and also a command
to delete itself at the end of its run.
Hardware problems may be difficult to fix or explain over the phone, but then, most
RSE won't involve hardware anyway; if you had enough on-site time to physically
mess up their computer, you should have had enough time to glean the information
that you are trying to get.
RSE Advertising Methods
Here are five general advertising techniques that can be used to get them to call
you:
Switch notes. If you see a slip of paper taped to or nearby the computer, with the
phone number of the computing department, get rid of it and slip a note with your
own phone number in its place (or some number at which you can wait for a call
from them). Elite hackers will simply dial into their local telco computers and
change the number of a local pay phone to the listed computer help desk number.
Also look for business cards and Rolodex numbers to either hide or switch.
Post a public message. On a bulletin board (thumbtack style, not electronic!) put
up a huge, brightly colored, professional-looking sign that says something along
these lines:
Technical Helpline
COMPUTER PROBLEMS?
CALL US FREE AT
OUR NEW NUMBER:
(123) ABC-WXYZ
Technical Helpline
67

Be sure to put the name of the company you're hacking, and their address and logo
somewhere on the poster to make it look like it's endorsed by the company. Put
these signs up all over, or drop them as flyers on people's desks, especially in view
of the computers you sabotaged.
Social engineering. Call up the day before - or even a few hours before - the
sabotage and tell the person who answers about the computing department's new
phone number helpline (your number). Ask whoever answers to Put it in the
Rolodex, or to keep it otherwise close by and handy for whenever anyone needs it.
Ask if he or she is the only one who uses that terminal; if the answer is "no," tell
the person to make sure others know about the new number too.
Directory tailoring. Get a company's internal phone directory and add your number
to the list, either by crossing out the existing technical support line and writing in
your own, or by inserting a visible printed addendum to the book.
On-line advertising. When doing the initial sabotage, see if you can post a note on
the bulletin board (electronic this time!) concerning your computer helpline.
Alternately, have part of the sabotage program give out the phone number. For
example, rename WREXE, then create a simulated word processor which crashes to
the operating system after the first few keystrokes, leaving behind garbled
characters and colors, and this message:
<Beep!>
XERROR 3 --- Consult fdox 900.2a or call Jim at technical support @ (123) ABC-
WXYZ
In your advertisements, make sure the user realizes it is an outside line they are
calling (so they know to dial 9 or 2 or whatever to exit the company PBX). That is,
do that unless you have managed to appropriate an inside office or phone (by
sneaking into an office while someone's away on vacation, for example).
Trouble For Nothing?
Okay, granted the initial setup and planning and sabotage is an exciting, amusing
kind of thing to do. But is it worth the effort? Why not just stick with the easier
social engineering and not worry about the remote possibility that the guy on the
other end will be wise to you?
Well, first of all, that's foolish. Especially considering that many of the people and
places you will want to hack most will be very security-aware. You must, in many
circumstances, assume that they know what you're up to when you're bullshitting
them. And if they know what you're doing, you shouldn't be doing it.
Another factor, one related to both this and a remark I made earlier: when you
reverse engineer a situation, you create a friend on the inside. Once you start
hacking big-time you'll never know if somebody's on your tail unless you have an
inside connection. If you've proven yourself to some user by solving their
computing problem, you can then call back a short time after breaking in and ask
questions like, "Hi, remember me? I helped you with that problem... I was
wondering if you heard about anyone else having that problem, or any other weird
stuff going on with the system?" If they've heard about attempted break-ins or
system failures, you will be the first to know. You might want to tell them to call
you if they ever hear about "hackers" or whatever. This way if you are discovered
and, let's say a memo is distributed telling everyone to change their passwords
because a hacker is on the loose, your contact will innocently call and let you know
about it.
The continuing loyalty and assistance you will receive from the inside is well worth
the beginning trouble you may have in setting up the sabotage.

68
Part Two
During Hack
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70
Chapter Seven:
Public Access Computers
And Terminals
Introduction To The Three Kinds
Have you been to a mall lately? I mean one of those huge, sprawling malls that not
only have clothing stores, electronics shops and food courts, but miniature golf
courses, arcades, banks, post of-fices, and anything else you can or can not think
of?
Instead of the large "You are here - >` maps they used to have, you now often find
computers set up with touch-sensitive screens that help you find your way around
the mall and inform you about mall happenings.
Personally, I've never hacked a mall computer - but the potential is there - and the
motivation to do so is there as well. Hackers hack because they are in love with the
idea that any accessible com-puter has a secret side that can be broken into. The
computers at the mall have a secret side - the gen-eral public is not supposed to be
able to change around the names of the stores on the computer-ized map of the
building - but there is a way of doing just that. Similarly, when you go to Ellis Is-
land and look up your ancestors in the computers, there is obviously some rear end
to the system that you are not being allowed to see. All public computers have a
secret side. A hacker is a person who wants to get at it.
This chapter addresses two aspects of publicly accessible computers:
• How to get into the behind-the-scenes parts, and
• using public computers to collect information you're not supposed to know about
the people who use
them.
The computers and dumb terminals that are publicly available are a great boon to
anyone inter-ested in hacking. Even if a general-access computer doesn't have a
modem hanging off the back, or does not allow out-dialing, hackers can benefit by
using the computer to gather information about legitimate users of on-line
databases, school net-works and other computing systems.
Computers are publicly available in lots of places - lobbies of office buildings, malls,
muse-ums, airport club lounges, public fax machines, public and private schools,
and in stores. However, the place they are most often seen is at libraries;

consequently, the following discussion is based mostly on the computers found
there.
71
Computers for the use of the general public are available now at most public and
academic librar-ies. They fall into three groups:
• CD-ROM databases and information computers,
• public access terminals, and
• general purpose microcomputers.
Let's look at each one of these in turn, and see how these can help the hacker help
himself.
CD-ROM Databases And Information Computers
CD-ROM databases, like InfoTrac and News-Net, are computerized listings of
periodical articles, updated monthly. Other databases are available with slants
toward business news, census data and the like. Some libraries have CD-ROM
encyclope-dias, and many government depository libraries will have databases
listing government publica-tions available.
In a similar vein, I've seen libraries with com-puters (usually Macintoshes) set up
with user-friendly programs designed to teach patrons how to use the library and to
dispense other helpful advice. All of these computers are useful to the hacker only
for the information they carry, due to the fact that they are set up on independent
ma-chines, without modems, and without access to telephone lines. They usually
serve the single pur-pose of dispensing information on their specific topic.
Finally - this is rare and a bit odd - but occa-sionally you will see a computer being
used as a register". As people walk into the computer room, office, or wherever,
they sign into the computer with a name and ID number, and perhaps answer a few
questions about themselves. The purpose of this sort of computer setup is to keep
a timed and dated record of who uses the public facilities. Of course, unless a light
pen or graphics tablet is used, signatures can not be collected and so their use for
security purposes is lost.
Unlike databases and tutorials, there is a bit more you can do hacker-wise with a
guest record computer, though not much more. One application might be to use
the computer to see who else has been using the facilities. This information could
be helpful if the facility in question is a computer room. You might be able to find
exploitable patterns in computer usage by certain individuals, or an overall
tendency for less people to be in the room at certain times, both of which are
helpful to know, as we will see.
If the guest register program itself doesn't let you see who was there before you,
try exiting out to the operating system and checking for relevant data files. This
will be discussed in the upcoming section on general-purpose micros.
Access to CD-ROM databases and information computers is not usually of much use
to the hacker. There are exceptions of course, and it's well worth investigating any
computer of this kind that you find.
Public Access Terminals (PATs)

These are usually dumb terminals (although sometimes you see IBM compatibles)
set up in fi-braries as electronic card catalogs. They have names like MS and GEAC.
These systems allow h-brary patrons to search for materials (books, magazines,
videos) by various search restrictions; to see the current status of materials (On
the shelf? Charged out? Overdue? Missing?); place holds on items; get library
news, and other library-related functions. Often dial-in lines are available, espe-
cially at university libraries.
The challenge to the hacker is this: He knows there is a secret side to every library
computer. How can he get into it?
Every library computer system is divided into two parts. There is the publicly-
accessible catalog, and the private stuff. The private stuff (the secret side) includes
procedures to discharge materials, get confidential patron information, add or alter
fines, block library cards, etc. These private func-tions, used by library staff, must
rely on the same database of information as is found on the PATs. (If the librarian
checks out a book to somebody, the fact that the book is not present in the library
must be shown on the public terminals.) Therefore, the functions that are available
to the public are a sub-set of the entire library program. That is, the pro-gram the
public uses to make inquiries on books is part of a larger program which includes
higher managerial functions.
The two program parts are obviously separated, otherwise anyone could walk into
the library
72
and erase all the fines off their library card, or put $100 worth of lost items on an
enemy's card. So, how is the public side separated from the private side? Take a
guess.
Yup, a password.
Actually, it's usually a combination of two things: first, a hidden menu command,
and then the password to authorize usage. Go to the main or earliest menu on the
library system and try various commands like BYE, END, EXIT, X, XXX, SYS,
SYSTEM, LATER, and OFF. Usually this kind of system will accept either three-
character corn-mands or single-character commands, but of course things vary
widely as you go from one system to another, so vary your tactics accordingly. If
some-thing like BYE works, and you are exited from the public portion of the
system, you will probably be asked to supply a password. Well, you know how to
get passwords! On the other hand, it may not ask for a password at all...
Several library systems use bar code identifica-tion to detern-dne who gets to go
backstage. If your library card has a bar code on it, then it is possible - but not
certain - that achieving system operator status relies not on uncovering a password,
but finding out some sequence of little black stripes. I have a story about this.
The Bar Code Hack
A certain academic library, close to my house, has dumb terminals and IBM
compatible micros set up throughout the building for the public to use. The IBMs
also have light pens attached. On those computers, patrons can access and change
infor-mation about themselves, using the bar codes on their library cards for
security.
One fine day I decided I wanted to hack the sys-tern. I knew from random trying
that BYE from the Main Menu brought me to a screen that asked for my bar code
number. Naturally, I was not allowed staff access, so scanning my library card did

noth-ing. I needed a staff card - preferably one with high access levels, like the
library card of the li-brary director, or some supervisor or someone like that.
I was not about to become a pickpocket to get a card. There was a better, more
flexible, more
hacker-like way of solving the problem. I would use computer technology to defeat
the computer.
When you look at a bar code, you will generally see little numerals printed below
the stripes. This is the number that the bar code is encoding. On a h-brary card
(or the bar code put on library books), the number is about sixteen digits long.
There is an initial grouping which identifies the bar code as belonging to that
particular library, followed by some zeros, and then a concluding seven or eight
digits. This kind of numerical arrangement applies to your checkbook account
number, and many other numbers used to identify you.
Now, the only part of the number that really matters is the last group of eight
digits, following the zeros, since the library identification portion doesn't change
from one person to the next. This meant that if I wanted to try a brute force entry
of every bar code number until I found one with high access levels, I wouldn't have
to try trillions and trillions of numbers - only a hundred million or SO.
Naturally I wouldn't be able to type in those bar code numbers from the keyboard
(and who would want to, anyway?). You see, the computers do not allow people to
walk over and type in bar code numbers. If they did, then anyone who knew any-
one else's code number could easily access the pri-vate records of anyone else.
That meant, even if I found out the bar code nuniber of the library direc-tor, I still
wouldn't be allowed into the backstage areas of the library program. I would still
need the director's library card.
A way you might be able to get around this is to scan your bar code, and look at
what happens. Did the computer put a carriage return at the end of the number?
If not, see if you can back up and alter digits.
If a carriage return was added, try scanning your bar code again, this time sending
a break or pause signal as soon as you do. You might be able to make the
computer think it's receiving the entire bar code, although you will be able to
change and add numbers to suit your needs. If you pushed con-trol-S to pause the
bar code - and it worked - try pressing control-C and see if this stops it from
reading in more digits from the scanner.
The bar code will be read in and placed on the screen rather quickly, so it may be
difficult to stop it halfway through. If there's a printer attached to
73
the computer, try sending output to it. This might slow down the bar code enough
to let you break it at the right time. Also, if it is a computer you're working on (not
just a terminal) there might be a "Turbo" button that you can press to take it out of
turbo mode. If there is no button (but you know it's in turbo mode because there is
a "Turbo" light lit up), there will be some way of disabling turbo mode through
either the software (break into the DOS shell and see if there's a SPEED command
or something similar), or through the keyboard (often something like Ctrl-Alt-Minus
sign will take it out of Turbo).
Another difficult thing to do is to try giving the scanner only a partial or erroneous
code. Occa-sionally bar code readers can be duped into think-ing a bar code of a
kind it's not supposed to be able to read is the correct type. Then it may read that
code and stop halfway through, to wait for the rest of the input.

Lastly, if there is a way of accessing terminal parameter menus, by all means do so:
often there is some sort of switch which toggles automatic send-ing of input, or the
key code used to send input. By disabling the automatic send, you can manually
input the bar-coded information.
All of these above suggestions imply that you have managed to get ahold of the bar
code number of someone important in the library hierarchy -someone whose ID
number you can use to access the rear end of the system. If you do happen to
know the number, then you can try to print up a bar code for it, either by using bar
code generating software, or by carefully examining bar codes until you have
determined what thickness and pattern of lines are used to represent the different
digits.
But I didn't have anyone's number. The pur-pose of my hack was tofind one. So I
had to find a way of using the light pen to scan in a hundred million bar codes that
I didn't have, until one was discovered that could access the library program's
secret side.
I could've used a bar code program to print out all of those different combinations
of digits but that would have been a huge waste of time and effort.
The light pen (also known as a "wand," "bar code reader," or "scanner") works like
this. Light is emitted from an LED inside the pen, focused through a sapphire
sphere (which acts as a lens) onto the bar code. The light is then reflected off the
page, and now focused through the sphere onto a photo-sensor, which converts the
reflected light into bursts of voltage. The electrical output of the photo-sensor is
amplified, thus generating a signal proportional to the series of black and white
lines of the bar code label.
The pen is attached to the computer either via some external box, or an internal
card. This box/card decodes the on-off firing pattern of the voltage into usable
ASCII characters. At the time of decoding, voltage corresponding to white lines is
approximately 0.11 volts, and 0 volts for the black lines. My plan was to send
voltages into the scan-ner, making it think it was reading a bar code, when really all
it was doing was being victimized by a clever hacker's brute force attack.
If you are programming a computer or signal generator to create fake codes for
you, some fidget-ing around might be necessary before you arrive at the correct
numbers for that particular system. Also, the time it takes to generate a complete
code will have to be adjusted accordingly: usually scan-ners will accept bar codes at
up to 45 inches per second. Perhaps you can manage to locate appro-priate
technical manuals or some source code list-ings, or call up the company and ask to
speak to a technician about what ideal values are for voltages and timing.
If it is a computer you are working with, rather than a dumb terminal, it is possible
the bar code decoding program is memory resident. You might be able to
circumvent that program, or trick it into reading input from a disk file you supply.
A good idea would be to copy the contents of the fixed drive, then at home see if
there's a way of making the scanner decoder think the keyboard is the cor-rect
RS232 serial interface to look at for input data.
Finally, remember that there will be a check digit at one end of the bar code, or
both ends, al-though it will almost never be printed on the label itself. If the check
digit is printed on the bar code label, study some sample bar codes and try to work
out the method used to generate the check digit. You don't need to look at only bar
codes on library cards - which you would probably have difficulty finding enough of
- you can examine bar codes on books and come up with the same result.
For example, the check digit formula used by the Universal Product Code found on
supermarket food packages is the following: 210 minus three

74
times the sum of the alternating digits (starting with the separated digit to the left
of the bar code), minus the sum of the remaining digits. The check digit is the last
digit in your answer.
Figure 6
The UPC check digit system. The initial digit may appear in either of the spots
marked with a 0. The subsequent digits are placed under the bar code, with the
check digit appearing in either of the two
places marked with a check mark.
The UPC check digit formula is:
210 - 3 (a + c + e + g + i + k) - (b + d + f + h +j)
For this sample bar code, theformula is:
210 - 3 (O + 2 + 4 + 6 + 8 + 0) - (I + 3 + 5 + 7 + 9) = 125
The last digit of the answer is 5.
Thus 5 is the check digit.
Back to the target of my attack, that academic library near my home. The light pen
at one of the computers was attached with a telephone-style modular clip. It could
easily be removed. I bought a receiving jack of appropriate size and used a cable to
connect it to the modem port of one of my smaller portable computers. Then I
modified an auto-dialer program to spit out bar code numbers in the range I
needed. I was all set.
A few days later it was Saturday, and it was a gorgeous day. I had expected to pull
off this stunt on a Sunday because I'd seen the results of a user survey which
indicated that less people came into that particular library on Sunday than any
other day of the week - the last thing I needed was a bunch of onlookers. But it
was such a beautiful day I figured everyone would be at the beach. I was right;
practically no one was there.

I detached the light pen from the library's com-puter and connected the plug into
my portable's jack. I typed BYE, which brought me to a prompt which asked for my
bar code before it would allow me to go backstage. Then I started the program
running. It worked fine - the program was send-ing bar code numbers through the
modem port and into the light pen cable. The library's computer had no way of
knowing that the data it was receiving was not coming from an actual bar code.
I closed the cover of my little portable, and hid the whole thing under a newspaper.
Then I sat there and read a magazine while it went through the numbers.
After a while I did find a bar code number as-sociated with a privileged account,
and I was able to use it to change the status of my own library card to a virtual
superuser.
That was great in and of itself, but having superuser status allowed me to go one
step further. Since I now had access to patron records, I could find out the
addresses, phone numbers, student 113s, social security numbers and birth dates
of eve-ryone with a card at that library. This meant I had background information
on virtually every student at the school, and every professor and staff mem-ber. I
could also find out what books were checked out to people, and therefore the
subjects and hob-bies that interested them. Using all this information it was a
simple task getting into many network accounts I should not have been able to get
into otherwise.
75
Hidden Commands
Whenever you're hacking any public terminal of this type you have to remember
that it's common to have different levels of security for potential us-ers of the
system. With each level, the various commands may or may not appear listed in
the menu - although you may still be able to activate them via an inadequacy in the
program. If a menu is given with options ranging from one to four -try five! And
six... and zero too. Always try Z, Q, X, and other "weird" letters - anything else
that has a possibility of working. It may not be enough to try these unlisted
commands just once; sometimes you can have the program display an error
message once or twice, and then suddenly crash out of the system or enter private
territory. I grant you, usu-ally you won't find that programs have been so badly
coded as to allow misuse, but you'd be sur-prised at the number of bugs that do go
unnoticed by the authors and testers. This is especially true of early program
editions.
Also, remember this: There are many functions you may not think would be on a
library computer (or whatever computer it is you're working on). There may be
mnemonics used which, on your own, you would never think of trying. So you must
therefore try everything you can. What I mean is, let's say a library's PATs allow
you to enter these three-letter commands to do different things: INQ (to make an
inquiry on a book), NEW (to get new user information), and PAT (patron
information, to find out about yourself). Naturally the system doesn't only support
those three commands. There are dozens of other commands that you simply don't
know about.
Try things like CON, ILL, CHG, DIS and other three-letter combinations (or
whatever number of characters is appropriate). On some systems, all commands
are three characters except for one called NEW USER or RECALL or something. If
that's the case, then you know the computer will support commands of more than
three characters. Consequently, you should try longer commands as well. The

commands I've chosen above are abbre-viations for CONversion, InterLibrary Loan,
CHarGe and DIScharge, respectively. Before I told you what ILL stood for, you may
have been won-dering how the word "ILLness" or "I Love Lucy" could have anything
to do with a library. But ILL happens to be a very commonly used abbreviation.
Figure 7
To fool the PAT into believing you are feeding it bar codes,first (a) remove the light
penfrom the computer.
Then (b) plug the jack into a receiver that is connected to your laptop via the
communication port.
You can then output bar codes through the comm port, straight into the PAT.
76
If you're trying to break into a system you know nothing about, it's more than likely
they'll use codes and abbreviations that are related to their field. Consequently,
ongoing research is a must.
One United Kingdom system uses things like LCO and LIN for Library Check Out and
Library INquiry. Also, due to certain overseas privacy laws, staff members are not
supposed to access patron accounts to see personal information like addresses and
phone numbers, and what books are checked out to patrons. This poses an obvious
problem to the librarians who MUST know how to contact people who refuse to
return borrowed items (and for countless others reasons, must know what items
people have borrowed), so the people who wrote this library program installed a
command that is invisible to EVERYBODY - even library employ-ees. Pressing "X" at
the book inquiry screen will ac-cess a patron inquiry mode. This is something that
the library staff obviously knows about and uses, but is not supposed to have even
heard of.
Anyway, the point is this: dumb terminals often include exits to controlling
programs. You can ac-cess these secret parts by either issuing an exit command (a
"trap door") and entering a password, or by entering a hidden menu item or
command statement. Access may also be unintentional and due to an error, as

with a program that lets you in even though you are not situated at a valid termi-
nal, or have not entered the password.
It is also advisable to turn off the terminal, wait ten seconds, then turn it on again
to see what hap pens. Some terminals respond to various combina-tions of Ctrl,
Shift, and Alt. (Sometimes Alt is la-beled "Compose Character" because if you keep
it pressed down while typing out a number 0-255 on the numeric keypad on the
right side of the key-board, the corresponding ASCII character will be produced.)
Also look at the function keys, and combina-tions of Shift, Ctrl, etc., with the
function keys. Try various other control codes like Escape, Ctrl-C, Ctrl-X, Ctrl-Q,
Ctrl-G, Ctrl-Break, etc. You can never tell what's going to do something, or if any-
thing unusual will happen at all. But sometimes you can get pleasantly surprised.
College PATs
There is also another kind of publicly accessible terminal, one easily found in the
computer rooms of any college. These are different from the infor-mation-
dispensing ones found in libraries in that these are meant to be used solely by
authorized us-ers - people with accounts and passwords on the system.
You should try the different function and con-trol keys on these terminals, too. This
isn't likely to get you anywhere, but often you can use various control codes to
access parameter menus or change screen colors.
Press ? or type HELP and see what commands are available to you. Most colleges
run an infor-mation system, possibly connected with the library system, which gives
you information on such things as student activities, phone numbers, office hours,
campus news, and might also allow you to connect with other college information
systems around the country, or possibly federal or state sys-tems. It should be a
trivial matter to find out if a public information system is present on the system
you're using, and if so, how to access it. If you don't know, call up the computing
department and ask. (Remember to ask for the dial-in phone numbers, too!)
Generally you will be able to use telnet or other networking protocols to connect
with computers all over the campus, country, and possibly, the world. However to
do so will more than likely require you to login as a registered user first. This
section deals with some techniques hackers have used to un-cover passwords and
lDs through the use of public access terminals at colleges.
Here's story #1.
Doing It The E-Z Way
Barry, a computer enthusiast from Las Vegas, Nevada, used a quite easy way of
finding out info without any programming skills or special equipment.
At the university Barry attended, there was a computer lab that had Macintoshs set
up in the center of the room and terminals around the pe-
77
rimeter. He had his own account on the system, but he wanted to do some serious
hacking. He knew if he tried anything logged in under his own name he might end
up in trouble. All he needed was some measly low-level account from which he
could hack without risk.
The public terminals at his school worked like this. Available commands or menus
were dis-played on the screen with an underline of appropriate size placed at the
bottom, where the user would input his choice. You could move around on the

screen with arrow keys and type elsewhere, but when you pressed Send, only the
characters written in the space where the underline had been would be
acknowledged.
Barry went to the main menu of the information system. He used the arrow keys
and space bar to erase all the text on the screen, then proceeded to reproduce the
login screen that was used to access the mainframe. At the bottom, he put the
appropri-ate prompt...
ENTER NAME/PASS IN FORM nnnnnnnn,pppppppp
... and positioned the cursor at the beginning of the underline. He switched the
Caps Lock key on, and he shut off all the other terminals. Then Barry took a seat at
a Mac near his prepared terminal, and waited.
Everyone seemed to want to use a Mac that day. He had to wait more than an hour
until a per-son finally came in to use a terminal. As Barry had hoped, that person
walked straight for the one that was already powered-up. From Barry's position at
the Mac he could easily see what the person typed in.
As you can imagine, when someone uses the ac-tual login screen, the computer
covers up pass-words with asterisks. The woman who was using the terminal did
not seem to realize that anything unusual was going on as she typed her vital data.
When she pressed Send after her password, she got the usual beep of disapproval
(because she had pressed Send without entering anything in the space that was
supposed to be used for commands, which Barry had erased). The computer
redrew the information system main menu, and the woman, surprised, logged in
again and went about her business.
Another computer user, who had sat down be-side her shortly after she entered the
room com-mented, "They've been acting weird all day." Barry was elated; on his
first try, with almost no effort on his part, he had a name and password and could
do all the hacking he wanted to without having it being traced back to him. Plus,
the bit of strange-ness he had caused was being blamed on unrelated system
malfunctions.
There are many variations of this tactic that should also be considered, depending
on the nature of the command system, the terminals used, layout of the room, etc.
You will want to adjust your strat-egy accordingly.
Some terminals allow you to change screen color. I've worked a ploy similar to
Barry's on one such terminal. First I erased the screen and typed up a fabrication
of the login screen. But it wasn't an exact reproduction - I put my underline one
line below where it normally would be.
I then moved the cursor over to the place on the screen where commands were
supposed to be en-tered (above my fake underline). I used a color-change function
key to make the characters I entered next appear in the same color as the back-
ground. I typed "log-on." It was black letters on a black background, so only I and
the computer knew it was there.
Then I repositioned the cursor at the beginning of the underline, used the function
key to change the text color back to bright white, and took a seat on a nearby
armchair.
I didn't have to wait long. About twenty min-utes later a group of people came in,
and one sat down at my terminal. Unfortunately, he saw the screen, thought
someone else was using the termi-nal, and he got up to leave. I told him, "No, no
one's using that one." So he reset the terminal and pro-ceeded to log onto a totally
different system!

A couple hours later I got luckier. I set up the terminal again and took my position
on the chair, pretending to study a numerical analysis book. Af-ter a long while a
guy sat down, typed in his name/password combination and pressed Enter. All this
I was easily able to see.
But the computer couldn't see what he was typing because he hadn't entered it in
the special input space. The computer only recognized my hidden (black-on-black)
"logon". The computer then connected to the ungradx machine, and asked
78
for the user's identity. The user, thinking he had made a typing mistake, entered
them again. I was already out of there, as I had the information I needed.
This will only work with systems that allow you to enter all login codes on a single
line, or on machines with certain appropriate capabilities and setups.
Another way is to use a text editor to simulate the login screen. If you don't have
an account on the system, and therefore do not have access to the e-mail text
editor, there is probably a "Send Com-ments to Sysop" section in the public
information system that you are able to access. You would probably want to use a
public editor anyway, to avoid having this evil-doing being traced back to your ID.
One way of using a text editor to simulate the login screen is to write up a
document such as this:
>login
Enter Name:
Enter Password:
Above this you may want to have the tail end of a commonly seen menu, list of
commands, or a body of text one normally sees when turning on the terminal.
You position the document so the last line vis-ible on the screen is "Enter Name:".
You put the cursor right after the colon, and turn off the Insert key, if there is one.
A person sitting down at the terminal will think someone else before him typed in
the "login" com-mand. He will type in his name and press Enter. Pressing Enter
scrolls the document up a line, making it look as though the computer is asking him
to enter a password, which he then does to your utter bliss, because you are sitting
there watching this unfold.
There are some problems with this method (and all these E-Z methods, actually).
What if the first person to sit down doesn't want to log onto his ac-count? Or what
if he makes a typing mistake which goes unnoticed until after he presses Enter? In
both cases your little deviltry may be found out. There's always the possibility that
some guardian of the computer room will switch off any terminals he sees left on
needlessly, and then all your work might be lost. Additionally, if you're doing this
on a university terminal that has access to lots of differ-ent computers, there might
not be a reasonable way to set up the screen.
There are plenty of things that can go wrong with this ruse, but for the small
investment of time to set it up, then who-knows-how-long of waiting, it's worth it.
If you try this, remember these tips: Do what you can to make reading the screen
from a distance easier. Switch on the Caps Lock key if it helps. Brighten up the
screen if you're able. Tilt the moni-tor a bit to reduce glare from your viewing
angle. And if possible, select large fonts. Before you choose your waiting spot,
make sure that when a person sits down in the chair, his or her body won't be

blocking your view. While you're waiting, keep yourself busy to avert suspicion, but
don't get so involved that you miss your quarry.
Shoulder Surfing
The above two methods are slightly involved examples of what's called "shoulder
surfing." Shoulder surfing is when a hacker looms over the shoulder of a legitimate
user as that user logs onto a computer system. While the user types, the hacker
watches the keyboard to pick up the pass-word as it is entered. Remember, most
login rou-tines will not display the password on the screen, so you must look at the
keyboard to get any useful information.
Pure shoulder surfing can only be done under certain circumstances, such as if you
are legiti-mately helping the user with a problem and you have to stand there for
the user to show you what's wrong. Most of the time you will not be able to just
stand behind a person without drawing suspicion to yourself; you will have to rely
on more crafty inventions.
A strategically placed mirror, in the upper cor-ner between wall and ceiling, can do
the trick. It must be small enough to stay put with duct tape, but big enough to be
read from a distance.
Binoculars are frequently used by calling-card number thieves to illegally obtain
people's code numbers, thus enabling the thieves to make free long distance phone
calls. You can do the same to read passwords off keyboards. It might be neces-
79
sary to tilt the keyboard to a specific orientation to better enable you to see what is
typed. If the key-boards have kickstands to prop them up, make sure you use
them before you take your stalking posi-tion.
You might have to do your watching outside, through a window. Before you do,
make sure you won't be visible to those inside. Even at night you will be easily
seen through the glass if the building has outside lights. Do some detective work
before hacking; go into the computer room and see how visible someone outside
the room would be. Per-haps you can partially close the blinds or drapes, to further
shield yourself from view.

Figure 8
An example of a menu on a public computer. Tricks
can be used to breakfreefrom the menu, then either
alter the menu or the application programs
to collect private user data.
Finally, think about this. Perhaps you don't need any of this advice at all. Over the
past two weeks, every day that I've visited a certain school's computer rooms,
there was at least one instance where I would switch on a terminal and find it stuck
inside somebody's account. Apparently the account owners didn't know that
shutting off the terminal does not log them out of their account. Occasionally I
would find more than one terminal left in a logged-in state. It was a hacker's
paradise!
Doing It BASICally
If you have an account - or if you go into the computer lab and find someone else's
account logged in and abandoned - you can write a simple BASIC program to
simulate the login procedures, then leave it running. Here is a very simple
example:
10 PRINT "Welcome to Y University Cornputer Network!"
20 PRINT
30 INPUT "Name? "; N$
40 INPUT "Pass? 10; P$
50 REM Now store these two variables in a file
60 REM and logoff from the account, giving an error
70 REM message. Or, use the inputted data to have
80 REM the program login to the system.
90 REM Finally, delete this program.
Remember to program in necessary time de-lays, if it usually takes a few seconds
for commands to register. Also remember to have the program print asterisks (or
periods, or dashes, or whatever's appropriate) on the screen instead of the user's
password.
Sometimes commands are available to users be-fore logging on, like allowing them
to see who else is currently logged on. You may or may not be able to program
phony responses to a user's queries. The program doesn't have to be extremely
elabo-rate, however, as most users will probably just sit down and login right away.
You might want to sit around in the computer room awhile and look to see what
commands get used the most, so you will be able to program simulations of them.
After the user is done typing his name and password, the program should store the
information, and exit out of your account. If you wrote the program in another
person's account (like the ones I mentioned finding logged in already) then the
program will have to transmit the data to you
80
somehow < Methods to covertly transmit data are discussed in the chapter "What
To Do When Inside.". > After all, once you log out of that account, you won't be

able to get back in again. On the other hand, the operating system might allow you
to save the file in your own directory if given the right access codes, or if you can
make your own account temporarily less secure, allowing others to write to your
directory.
Hacker security is very important - you never know what superuser is spying on
your activities. Therefore, it would be wise to encode volatile in-formation like
other people's passwords before they get stored in a file in your personal directory.
I use a simple code, such as storing 13 + ASCII code of each character, with every
other number stored being random. So for the name/password combi-nation
SM=RS/RANGERS my program would store 96 90 86 97 85 82 95 96 / 95 78 91 84
82 95 96, with random numbers between each of these num-bers.
An expansion of these ideas is found in an up-coming chapter.
Hardware Methods
One thing I've done is to take an old, unused terminal I found hiding in a basement
storage facil-ity, and wire it up to a portable computer. At about four in the
morning I smuggled the thing into the computer lab, and replaced a terminal that
was already there with my own, connecting the cable to the portable.
I hid the portable under the table. It was a wooden table with an overhang. I used
an electric stapler to make an old pair of cut-off jeans into a pouch that hung down
from the underside of the table, and I enclosed the portable within it. I had the
portable programmed to save on disk the first ten characters that appeared after
"Usernarne:" and "Password:". Basically, the portable acted as a rnonitoring device,
working between the terminal and the mainframe. It worked well.
The only thing that didn't work out was when I replaced the computer room's
original terminal a week later. The guy thought I was trying to steal it.
There have been hackers who've taken old terminals, opened up the plastic casings,
and hidden little computers inside the terminals! There was not enough room in
the terminals I was using to do that, but in certain situations that would be a
preferable thing to do. Make sure the computer you put in and any wiring
associated with it stays sepa-rated from the internal goings-on of the dumb
terminal. When hackers hide portables in this way, they are generally putting their
computer inside an otherwise hollow, bulky base of the terminal.
General Purpose Microcomputers
Now we come to the third We of Public Access Computer from that list I gave
several pages back: the General Purpose Micro. I'm going to be talking here about
IBMs and MS-DOS machines, although nowadays we're seeing more and more Macs
out in the open for public use. Of course, all techniques I discuss can be translated
to any computing envirorunent.
Let's say you call up your local library and make an appointment to use a computer
there, for word processing or business or whatever. Ordinar-ily these are non-
network machines, although if there's more than one they may be connected to the
same printer, or to some other peripheral. At col-leges, the word processing
software may be on a non-writable disk - on some sort of mainframe or
minicomputer. There are also businesses set up now where people can go to rent
time on a com-puter to type up their r6sum6s or reports, and have them printed
out on a good quality printer. Set-ups such these can be exploited to the hacker's
benefit.

Breaking Free
The first thing you'll notice is there's some kind of menu system on these micros.
The people who run the joint don't need some snot-nose kid coming along and
formatting their hard drives or leaving behind obscene messages, so certain
protective de-vices are used to guard against such activities. It is generally a trivial
matter to get out of the menu program, even though its very existence - at least
partially - is to keep you from doing just that.
If the computer is turned on already and at the main menu, look on the screen for
any indications of commands that shouldn't be there, such as "Alt-X to Quit." Try it
- does it work? You might
81
exit the menu, only to get a message like this: "Error! Press any key to return to
Menu." What happened is this: when the computer was first turned on in the
morning, the menu system was called up by the ALJTOEXEC.BAT file. By typing
Alt-X, you have been returned to the AUTOEXEC.BAT shell, and are experiencing
the next line of that BAT file. Simply Ctrl-C your way out of there.
Even if it doesn't say on the screen how to leave the menu, you will want to try
various function keys, the Ctrl-Break key, the Escape key, and differ-ent
combinations of Alt and Ctrl with C, X, and Q.
Often menu systems will have you enter a password before allowing you to exit to
the operat-ing system. If this is the case with the one you're hacking, by all means
try various passwords -starting with blank lines, the name of the building or
company, and other obvious work-related and business-like words.
Computer systems are at their weakest when they're moving from one program to
another, so try choosing a menu item and using Ctrl-C as soon as it's selected.
Actually, for best results you should repeatedly tap Ctrl-C and the Ctrl-Break key
simul-taneously.
If none of this works, turn the computer off, then turn it on again and see if you
can Ctrl-C or Ct4-Break your way out of the ALJTOEXEC.BAT startup procedures.
Alternately, you should have your own program disk ready to boot. If both of these
tactics fail, use the menu system to run the various programs listed and see if any
of them have an escape to the operating system.
For WordPerfect, you can shell out with Ctrl-F1. Wordstar allows shelling or single
commands to be entered with Ctrl-K, F.
Freedom Means Free Roaming
Once you are able to exit the menu system you will be able to explore the
computer.
If there are lots of computer-wise people around, or people looking over your
shoulder, or people in charge running all over the place, then you'll want to get
back to authorized sections of the computer ASAP so you're not discovered in the
private parts and thrown out of the building.
My recommendation is to copy everything relevant to your cause onto floppies, then
take them home to examine them at your leisure. This is akin to the burglar who
steals the entire unopenable safe so he can work on it in his basement with noisy
power tools and blow torches.
Copy the AUTOEXEC.BAT file and the menu system first of all, and any directories
you find containing files with BAT, DOC or TXT extensions; miscellaneous disk

utilities (especially public domain-type programs); security, maintenance, or
updating programs; anything having to do with telecommunications; memory
resident programs; other explanatory text files.
Especially if the computer's on a LAN, there may be a D: drive, F: or H: or an L:
drive, or some higher-lettered drive that you wouldn't ordinarily even think of
looking for.
Check for hidden files and directories. Copy them, too, if you find any. Also see if
any files have been deleted, and try to recover them if they appear applicable to
your needs.
Depending on the situation - the computer, the place of business, other relevant
factors - you may or may not find anything on the computer. Often it's worth
hacking a public computer like this just for the thrill of getting by security
measures. However, the computers are often so poorly pro-tected that even this
thrill is a minor one.
Many times I've found public domain and shareware utilities that I'd never seen
before, so it's worth doing this just to see if you can pick up any-thing new along
these lines. You may even pick up some valuable programming hints or ideas -
some of the batch and script files you'll find can be im-pressively complex.
Another thing that's common is to find in-house programs on the system - things
like employee schedulers, databases, or other programs that are not available for
public use, and are reserved for use by the managers of the business or library.
If the computer has telecommunications or networking abilities, there may be
handy phone numbers or sign-in protocols you will be able to use.
If you have encountered prompts for passwords in your exploration of the
computer, try to find out where the master list of passwords is stored on the disk.
One time I broke out of a public
82
menu program in a special library, and after looking around awhile, found a
carefully hidden file called PASSWDS. I typed it to the screen and was surprised to
find a list of about six user names, along with passwords, addresses and other
personal information for each name. Naturally I was overjoyed, but to this day I
haven't figured out why they were there. I tried those names on all the systems in
the area without success. I tried fingering the people ("finger" is a UNIX command
that allows you to look up information about system users) on the major
computers, to no avail. The people listed in the file seemed to not exist anywhere I
looked for them! Perhaps someone was just using the file as a test or demo, or on
some private computer system... but then why was the file hidden away so well?
Sometimes you will discover red-herring clues of this kind, trails that seem to lead
nowhere. It's all part of the nature of being what you are. Hacking is frequently a
matter of intense research, with the goal being to establish a hypothesis, a question
that needs answering. Once you have decided on a question ("Will this password
list work on the Raamses 3?" "Does the President of Moroll Corporation have a
secretary with system access?"), then you can do higher level research and try to
answer
it.
PACK

When you go out on a public hacking expedi-tion, you'll want to be prepared by
taking along your PACK: Public-Accessible Computer (hacking) Kit. This kit should
include:
Plenty of blank, formatted disks, in both 3%" and 51/4" sizes, so you can quickly
copy the menu's security programs. Make sure these disks are the proper density
for the drives you will be using.
Auxiliary programs, such as superzappers and other utilities. You will also want to
bring any special programs you have written (such as menu simulations, as
discussed in the next sec-tion). Public domain programs are available to shut off
the internal speaker. This can be useful if you're hacking a computer that lets out a
loud and suspicious beep every time a wrong pass-word is entered.
Other tools: A Swiss Army knife is good, or at least bring a little screwdriver. Very
often, es-pecially on CD-ROM workstations, you will find locks or covers placed over
the disk drives to limit access. A large, unbent paper clip is handy for hacking
Macs. If you have to leave in a hurry, you can slip the end of the paper clip into the
hole next to the disk drive, and your disk will pop out. That's often the fastest way
to eject a disk.
Menu Simulation And Other Sneakiness
For protection and simplification purposes, just about all general-purpose public
computers will boot up to a menu program. There are three fruitful programming
ideas the hacker can employ with these:
• altering the menu,
• altering the menu program, or
• creating your own simulation of the menuing system.
Menu programs will have a menu-editing op-tion. This allows the people who
maintain the computers to create menu categories such as "Business Programs,"
"Word Processing," and the like, and to add and edit the programs available for
public use. The way to work menus to your advan-tage is to use the editing feature
to add or change an option that will appear to be taking the user into an area where
a password is required. However, what the menu will really do is take that user to
a program that you wrote, that simulates an envi-ronment the user is familiar with.
The user inno-cently enters his user ID and password (which your program stores),
then an error message is given and the user is returned to the menu. Later, you
can go to where the computer hid the passwords and lDs, and retrieve them for
your personal use.
The first question is, how does one edit the menu?
The menu-editing feature may be part of a sec-ondary program, such as
INSTALL.EXE or SETUP.EXE. You may also be able to do editing di-rectly from the
menu program itself, by pushing a function key or control code.
Problems start arising because you were not meant to be able to change the menu
setup on pub-
83
licly available computers. The menu-editing feature may have been eliminated
once the menu was set up, or a password might be required to do any-thing.
Maybe you can re-install the program, recreat-ing the present menu from scratch,
while putting in your own additions (to be discussed soon, hold your horses!).
Alternately, you might be able to use a text editor or superzap program to change
the file where menu information is stored. If you start get-ting error messages

when you try to change the file, the ATTRIB command might have been used to
"lock" the file. Just type "attrib filename -r" to un-lock it (on MS-DOS systems).
The way these menu programs work is, the per-son doing the editing must supply a
short phrase that will be displayed on the screen. He then must choose a file to be
executed when that phrase is se-lected, possibly providing a drive path, and other
information.
Suppose you want to infiltrate a university computer system. Your initial target is a
public computer with word processing, spreadsheet and telecommunications
abilities. When someone sits down and selects "Telecommunications" from the
menu, he or she is either connected to a host server, or asked which computer he
or she would like to connect to. Then the connection is made.
That's what it's going to look like is happening. What actually happened was that
when the user pressed "T" for "Telecommunications," the menu ran a program that
you snuck onto the system, instead of actually connecting to the network.
The program you put on should look like it's doing whatever normally happens
when someone selects "Telecommunications." For example, it might prompt for
which computer the user wants to connect with, and then pretend to connect to
that computer. Your program then presents the name and password prompts, and
saves those lovely words to disk!
Next, you can have the program give an error message and return the user to the
main menu, but that looks suspicious and will cause the people in charge to take a
closer look at their computer setup.
You'll be better off having your little simulation program being called from a batch
file. When it's through executing, have the next step in the batch make a real
connection to the system. It might be possible to have the batch file feed in the
name and password the user entered, thus eliminating any trace of weirdness.
Otherwise, have it print the standard "password not valid" message, and then
connect to the network.
In other situations, the "Telecommunications" option will bring the user to a
commercial terminal package such as ProComm Plus or SmartCom. Again, it is
easy to make your own fake version of one of these programs. But there is a catch.
When the user enters your fake terminal program, he will select a phone number
from the list, and attempt to dial it. He will be awfully suspicious and confused if
the speaker is on and yet no dialing sounds come out of it! (Remember, you
somehow have to make the program appear to dial out, so you can then simulate
the network that is called. Then the user will enter his password thinking he has
actually ac-cessed the network.)
The most reasonable way to solve this dilemma is to have the program give an
exotic error message like:
Operating Error 2130: Line Noise Interference.
Shut off your speaker and try again.
Of course, this message should closely conform to the other error messages that
the terminal pro-gram actually puts out.
Once the user shuts off the speaker, the pro-gram can then pretend to dial out, and
give the standard login screen for that network. The name and password is taken
and quietly stored to disk, and then an error message is given and the user is
logged off.
You may want to have the computer just put a lot of garbage and random
characters on the screen after the name and password are entered. Make it look
realistic - like the kind of line noise that we've all gotten at one time or another -

but make it excessive. The user will be forced to log off al-most immediately. If he
doesn't, or if he tries doing anything, just have the computer display the stan-dard
"Logged off. Good-bye!" message. It may be possible at that point to have the
computer load the real terminal program, so it will look like nothing very unusual
has occurred.
It is unusual to find commercial terminal pack-ages on public computers, mostly
because that would lead to people coming in and placing calls to halfway around the
world. But offices and busi-
84
nesses might have them, so consider these ideas when you think about hacking on-
site.
Let's go back to the menu program.
The menu program might not be a commer-cially available one. It might have been
designed in-house, or in an interpreted language such as BA-SIC, or for some other
reason the source might be readily adjustable. The program might be just a batch
file.
If any of these are the case, you will be able to effortlessly change the menu
program itself, either by building subroutines that store names and pass-words, or
by adding a telecommunications option if one is lacking.
The final variation on the menu ploy is to com-pose a simulation of the menu. That
is, if you are not able to change the already-existing menu, you will have to write a
program that looks like the es-tablished menu, but with your own embellish-ments
on it.
It can take a while to replicate the menu pro-gram. If the menu uses pop-up
windows you will have to write routines for screen dissolves, or pro-gram-in
windows that explode open and implode to a close. You will have to carefully take
note of screen colors and special characters displayed, how the actual program
handles invalid data, and other peculiarities of the menu.
While the programming may be difficult, you are better off using your own menu
because that will make it easier to hide the captured passwords and other goodies
that are the goals of this project in the first place.
Hiding Your Goody Basket
All of the above menu methods, as well as many of the techniques explained earlier
regarding simulating network login sequences and capturing keystrokes, result in a
file being saved to disk. There are two things you have to worry about: That your
file will be discovered, and that your file will be read. Let's look at how we can
prevent both of these from occurring.
The thing is, since most of this takes place on public computers, anyone at all may
locate your precious files. This includes the people who run the computer labs,
those who fix the computers, other hackers, and the oh-so-curious general public.
It also includes the computer itself.
Most public computers you encounter will have a self-cleaning routine installed.
Weekly, monthly, or perhaps every night, the computers will have all their old data
files erased, to keep room on the drives for new material.
Most public word processing computers have notes attached that beg people to
bring their own disks on which to save their work, but there usually is a special
USERS directory, or some other area where anyone can save files.

The cleaning program is used to clear away old files from this directory. The
program will often scan the rest of the drive, clearing away files that users have
stored in other directories. Often on public computers you will see dozens of empty
di-rectories scattered about; usually these directories have human names to them.
These are private di-rectories that people made for themselves in the hopes that
other users wouldn't read or delete their files - never realizing that their files would
be de-leted by the computer. Often the cleaning program is too dumb to recognize
that the directory, too, should be deleted.
Before you put your altered menu program or whatever onto a public computer, you
must do some experimenting to see what kind of cleaning system it has, if any.
There's no sense in spending hours on a project only to have it erased soon after
it's implemented.
If a cleaning program does exist on the computer, you should have it copied over,
along with everything else, from your initial investigation of the computer. Take a
look at the program; there will be plenty of ways to defeat it. The cleaner probably
has a data file that holds information on which directories it should examine, what
should be done with the outdated files it detects, what cal-endar date constitutes
"oldness," and other perti-nent variables. You may be able to use this file to your
advantage by adjusting it so that your own special directory or program will be
ignored by the cleaner.
If the computer activates the cleaning program automatically, your explorations
might lead you to find the trigger that sets it off and causes it to delete certain files
and not others. For example, the cleaning program could be connected with a
logoff function, so that before the computers are shut
85
down for the night, the drives are scanned and un-wanted files are removed. The
cleaner could also be activated as part of a start-up routine, or a regu-larly-
performed maintenance check. In any case, a careful exploration of the files on the
system will reveal the pattern they follow. Once you find the program that sets the
cleaner off, you will be able to make alterations to your own file so that it is ig-
nored, rather than deleted.
Often the cleaning program is an all-or-nothing monster that wipes out everything
in its path as it crosses the hard drive. However, there are consid-erate versions
that only delete old files. You can get around these gentler kinds by writing a
simple program. Here is an example of an MS-DOS batch file that changes the date
of your hidden goody basket in the example (a text file called "filename") to one far
in the future. Append this batch file to the end of the AUTOEXEC.BAT, or to the
point in the system's maintenance routines directly before the cleaner is activated.
Your file will never be erased.
@echo off
ctty nul
date < commandl > temp edlin temp < cornmand2 date 12-31-1999 edlin filename
< command3 edlin commandl < command3 edlin command.2 < command3 edlin
command3 < command3 date < temp, del *.bak
del temp.* ctty con
For this to work, you need to make up three auxiliary files. Here we are calling
them commandl," "command.2," and "command3," but you would want to name
them something more in-nocuous. "Commandl" contains a single carriage return

(Control-M). "Cornmand3" is a file containing only the letter e. "Command2" is a
bit longer:
2d
I rCurrent date is
1rSun
Irmon
IrTue
IrWed
IrThu
1rFri
IrSat
e
The batch file works by using the "date" command to change the date to December
31, 1999. EDLIN is invoked to save the password file (containing the goods), and
the three auxiliary files, under this new date to protect them. a y, the date is
returned to normal. Note that MS-DOS can be set up to display the date under
various formats. You might have to alter the batch file and "Command2" if your
target computer is set up in an irregular way. Also, realize that "temp" is a com-
mon filename. You would do best to use something exotic in your own program.
AUTOEXEC.BAT files get changed often, and a batch file like this sample is bound to
be noticed by the maintenance staff. To keep your coding discreet you may want to
keep this and similar batches in a separate file far away on the hard drive from the
AUTOEXEC. BAT. At the point in the AUTOEXEC where your Trojan batch would
have been executed, you can use the DOS "call" command ("call BATCH.BAT" will
execute your Trojan and, once it's done, return to the ALJTOEXEC batch file). Your
batch file can be suitably camouflaged as described below, and there is now only
one imposter line in the AUTOEXEC batch for a maintenance worker to notice.
Also remember that under certain operating systems, such as MS-DOS, the
"ATTRIB" command can be used to make filenames invisible in the directory listing
("attrib FILENAME +h" turns on the hide factor). ATTRIBing a filename is not really
secure, as there are many ways someone can either accidentally or purposely find
out about invisible files on a hard drive. But eliminating the name the from the
directory certainly does much to halt casual discovery of your Trojan files.
Things To Watch Out For
I'm going to list a few things to be careful of when you implement a program of this
kind. My remarks will be directed toward this program in particular, but they are
far-ranging enough to be
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applicable to just about any program like this that you hide on a system.
First, make sure EDLIN is there, as well as DE-BUG, TREE and other external DOS
commands. They may not be available on the computer you are using, and you can
end up with a mess on your hands, and discovery of your intentions. When you
attempt to copy these files you may find that the DOS directory has been write
protected. In that case you may have to put the necessary commands in an
alternative directory. This might expose them to the ravages of the clean-up

program. If the cleaner does delete these external commands you will have to
figure out some solution to get them onto the disk and protect them from the
cleaner. This batch only works on text files - EDLIN will mess up binary files.
Second, you will have to make sure beforehand that the DOS directory is in the
PATH. What that means is, for a particular file to be executable, it must either be
located in the current directory, or in a directory that has been predefined (usually
by AUTOEXEC.BAT) as a place for the operating sys-tem to look for files to execute.
This is no problem of course - just add a PATH or CD statement be-fore the first
EDLIN - but it is something you could easily overlook, especially if you had to add
the special commands yourself to an unusual or unfamiliar directory.
Also notice before installing any programs: will there be enough space on the disk?
Enough mem-ory? Does the program try to create the temp file in a locked
directory? (If so, open temp in a USERS di-rectory, or some other writable one.)
Does a file named "temp" already exist? How about "Corrunandl," "Command2" and
"Command3"? There are alternate ways to use this program. In-stead of having
the date-changer execute before the clean-up program, it could be run every time
the password file gets updated. Though it takes a few seconds to run and that time
might be enough to noticeably slow down the user's application pro-gram. Recall
that this program is meant to be used in conjunction with some sort of Trojan horse
you've installed; the horse itself will slow down the computer somewhat already,
the combination of the two programs might be too much to go unnoticed.
The clean-up program might use some other criteria which helps it decide which
files to save and which to throw away. You will have to use similar programming
techniques to thwart its ad-vances accordingly.
If there is no special clean-up program, the hard drive will be cleaned by an actual
human being. That human being might not be clever enough to look outside the
designated USERS directory for files, but you have to act as if that person is as
clever as you. Anyhow, you never know who else is using a public computer, so
you will have to take measures to hide your precious password files from view.
Here are a few suggestions:
Change the hidden-file attribute so that it is not listed in the directory.
Place it in an obscure directory or in an unreach-able one. Try this experiment. Put
the following commands into a batch file:
:Start
mkdir dir
cd dir
goto Start
and then execute it from the root directory. After sixteen nestled directories named
"dir" are created you will get an error message. Press Control-C and look at what
has been created. You will find that within the innermost directory it is impossible
to make any more directories - there's a limit to what the computer has been
programmed to handle. However, you can use a disk management utility or your
own system calls to prune and graft many more directories inside the deepest one.
Those grafted directories will be impossible to see or ac-cess from the DOS shell. If
the clean-up program uses the DOS command TREE to scan all the direc-tories, it
will crash or freeze once it gets to those il-legally nestled directories you put there.
You don't want that to happen: that would lead to discovery of your secret files
hidden within that directory. Accordingly, this trick requires that you have the
programming prowess to write prune-and-graft programs on your own. Your Trojan
horse would have to be able to move the data file from its pro-tected position, then
back again afterward.

One thing you are certainly DOS-sophisticated enough to handle is to camouflage
the files you want to protect within their directories. DON'T use
87
filenames like SECRET.PSW or HACKER.HA! Use a bit of creativity when naming
them. Go into one of the applications directories and see if there are any patterns
to file namings. If you see for example, that a spreadsheet has files named
AFGRABL.OVL, AFGRAB2.OVL, AFGRAB3.OVL, then name your files AFGRAB4.OVL,
AFGRAB5.OVL, etc. Do you think anyone will bother to look at them then? You
might want to split up the files, putting each in a separate directory; don't forget to
specify the proper drive paths in the batch file that uses these files.
Trojan horses on public access computers can be an excellent way to slowly-but-
surely collect passwords for your enjoyment. However, all will be for naught if,
when you come back the next day to see what you've reaped, all of your files are
gone. Protect yourself, and your handiwork.
Keep in mind as you read about these special programming tricks, that I'm not
implying you should actually sit out in the open and edit menus or sift through files
looking for passwords. Never do that! You must always first make a preliminary
examination of the computer as I described earlier. You will have already copied
over the important and unusual files - in this initial exploration of the computer -
and you should have the entire menu program at your disposal. At home and at
your Iei-sure, you can write the programs necessary for this kind of hacker attack.
Then, once you've finished the programming and editing required, you can go back
for a second session at the public computer, this time secretly installing your
mutated versions of their programs onto the system. This reduces the amount of
time you will have to spend in a public place doing questionable things to somebody
else's computer. It also reduces the chance of error in the things you do.
You must be especially careful with computers that are meant to be used only for
short periods of time. Guest registers, as described earlier, are used for the few
moments it takes for a person to enter his or her name and identification number.
You will look extremely suspicious fiddling around there for forty minutes, taking
notes and inserting disks.
It is not the other users you have to be wary of: they couldn't care less about you,
and if anything, will probably mistake you for someone who works in the building.
Depending on where you are, you
might not even have to worry about being caught by the office or lab managers,
computer aides, or whatever the official designation is for the people in charge. If
it's a college computer lab being moni-tored by one or two students, they might be
curi-ous, but won't pry as long as you don't stay longer than you're supposed to at
the computers. It is al-most never a good idea to come right out and admit you are
snooping around for the express purpose of gathering data to be used in hacking. A
comment such as, "Oh, I just wanted to see how they did this batch file," or some
other appropriate explanation, is a good enough excuse for most such people.
Some computers are public; many more are private. That is the topic of the next
chapter.
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Chapter Eight:
On-Site Hacking:
The Trespasser-Hacker

In the previous section we discussed methods of exploring publicly available
computers, but there is another.side to on-site hacking. It is one that you might
think would be best left to spies and thieves, but one that you can actually
participate in yourself. I'm referring to the on-site hacking of, not public
computers, but private ones. Basically, I'm referring to trespassing.
It is risky and possibly dangerous to walk into a company headquarters and simply
start using the computers you find there. But it's also thrilling! It is an electrifying
experience to first maneuver one's way into a restricted place and then, while
there, to explore both the building itself and its computer system.
Sometimes, on-site hacking is a necessity. In many situations, computers will not
be connected to outside phone lines. More secure setups might use some facet of
the hardware to validate authen-ticity. You might have to use a particular kind of
terminal or modern, or install a certain security chip to access the system. In these
cases you would have to hack on premises. Furthermore, reverse social
engineering often requires admission to the computing site. Hacking is about
computers; there are lots of reasons why a hacker will need to be able to touch and
see those computers in person.
You might think it would be virtually impossible to do this, but more often than not
it can be an easy thing to do. For example, security expert Robert Farr, in his book
The Electronic Criminals, explains how he penetrated the "heavily guarded company
headquarters... [of] ... a well-known office machine company" to win a bet. Farr
also tells an anecdote of his entry into a vault at the Bank of England: "There I was
standing inside a vault con-taining millions of dollars with a bewildered look on my
face, wondering what to do next."
Farr did it with prethought, planning, and sometimes blundering. You can do it too.
In some ways it is easier to enter large organizations like this than the local
insurance office or small busi-ness. Wherever you go, you will often have cam-
eras, guards and possibly biometric devices (see below) to deal with. All of these
can make it tough
89
for a hacker to get close enough to even touch acomputer on site, let alone
infiltrate it.
Closed-Circuit Television
My home computer broke a little after 5:00 p.m. one night. I called up the store
where I bought it, trying to reach the service and repair department. Nobody
answered the phone. Finally I spoke with someone in the computer department
who assured me that people would be in the store until 9:00 p.m. to deal with my
broken computer. So I drove over there, lugged my computer downstairs to the
repair department and - guess what? The place was empty.
The door was open and unlocked, the lights were on, thousands of dollars worth of
broken appliances were lying around, and there were two of the store's terminals up
and running. All I had to do was step behind the counter and I'd be able to see
what made them tick. But surely someone was there? I yelled for assistance. I
rang the bell. I walked behind the counter and into the back areas of the shop.
The place was absolutely devoid of life. And there were those two terminals
there....

The only thing that stopped me from fooling around with them were the hidden
security cam-eras I spotted. Now, as it turns out, I did some checking around the
store until I managed to find a room that appeared to house the viewing monitors
associated with the store's security cameras. Natu-rally no one was paying any
attention to them, so I went back downstairs, closed the door behind me, and had
my way with those terminals. Even though the monitors were not being watched, it
was good that I had seen those hidden security cameras. You, too, should be wary
of such things when you attempt to hack on private property.
The correct terminology for security cameras is Closed-Circuit Television, or CCTV.
Both black & white and color transmissions can be sent over pri-vately owned
cables from distances of a few feet to hundreds of miles. Usually black & white is
used, as it is less expensive and color is generally an un-needed feature. No
licensing is required for most private CCTV installations, so given the relative
cheapness of the technology, such security meas-ures can be found in many
settings.
The cameras employed may be either openly visible or hidden (as my department
store cameras were). Another approach is to place an empty cam-era frame in an
obvious location, while hiding an actual camera in an unusual spot. A trespasser
will then cringe from the dummy camera, straight into view of the well-placed real
camera. Dummy cam-eras may also be used to give a false sense of high-security,
when in reality only a few, or maybe no security precautions are in place. If you
see some cameras visibly panning back and forth, but one or two remaining
stationary, it is likely those motionless ones are either broken or fake.
Many cameras, especially ones used out-of-doors, will be contained in some sort of
housing. This housing may be a conventional metal box, or one more suited for
covert surveillance. For example, cameras are often placed in housings made to
resemble a light fixture, smoke detector, loudspeaker, or utility box. Cameras may
also be placed behind grillwork, pipes, or a one-way rnir-ror, or hung from the
ceiling inside a translucent plastic dome.
If you are trespassing you must be aware that hidden cameras exist, but you
shouldn't necessarily try to seek them out. After all, you don't want to give a
camera a full-frontal shot of your face and body. You're better off, when walking
where you oughtn't, to walk tall and proud, but don't stare at the corners or ceilings
of rooms. If a shape pro-trudes from a wall or ceiling, pay it no mind - it won't do
you any good to stare.
Note that many surveillance systems are not all that great. Images picked up may
be fuzzy, dark, full of shadows, and generally hard to see. Others, however, give
perfect views of a point or an area within the camera's range. Concealing a camera
may hinder its usefulness. Placing a concealing grillwork in front of a camera will
result in a loss of detail in the images the camera picks up. Hidden cameras are
more likely to be stationary and fo-cused on a single point, such as an entrance or
exit, or a particular point in a hallway.
You often see cameras outside buildings, near rooftops or over doorways. These
will be protected from the elements with suitable housings, sun-shields, fans,
wipers, and/or defoggers. Outdoor cameras are often contained in a white or
alurni-nurn housing with vents on the sides. If they are outside, they will have
night viewing capabilities, and so you may be detected even before you enter the
building. I remember walking across the lawn
90

of a Johnson & Johnson building one rainy night, and as I got closer to the building,
I looked up to see two guards with their faces pressed against the glass, staring at
me.
If you absolutely must trespass a building or its property to get to its computers,
try to go at night during a thunderstorm. Visibility will be poor, you can use your
umbrella as a face-shield, and if you get chased away they will be reluctant to
chase you very far.
Biometric Systems
Controls based on personal characteristics are the ultimate in computer access
control - when they work properly. Known as biometric systems, these devices
limit access to a computer or the computer room by verifying physical attributes of
a person. A biornetric system may look at any one of these individual traits to
verify user identity: fin-gerprints, voiceprint, handwritten signature, palm print,
hand geometry, or retinal patterns.
Biometric systems are costly to implement, but they are not always as accurate as
television would have one believe. For example, a legitimate user's voiceprint may
be rejected because of a change in voice pattern or voice speed due to illness or
stress, or because of interference from outside noises. One system I tested would
occasionally offer responses to the noise my finger made as it scratched the mi-
crophone!
Similarly, finger and palm print technology can be thrown for a loop due to cuts and
scratches on the hand, dirt on the hands, bandages and blisters, or scrapes in the
glass tray on which a user places his finger or palm for scanning. Signature and
handwriting analysis systems sometimes fail to pick up nuances in pressure, style
and velocity; people do not always write their names the same way every day. I
imagine this would be especially true for someone rushing into the computer room
to print out a report three hours past deadline. Hand injuries could also make a
person's signature look different.
Hand geometry devices - those which meas-ure the length and translucency of
fingers - don't seem to have much going against them, although again a Band Aid
or scraped machine tray could easily cause the rejection of an otherwise legitimate
system user. Finally there are retinal pattern rec-ognition systems, which look at
the pattern com-posed by blood vessels in the eyes. These too have been shown to
be reliable in their accep-tance/rejection rates when user cQmplicity is high.
I point out the flaws in these systems so you will get a feeling for what it must be
like to work in a building where you're required to get your eye-balls scanned every
time you want to walk through a door. Or imagine being in a place where you have
to speak foolishly aloud to switch on the computer. The first few times it may be
seen as a novelty, but soon these gadgets become another ho-hurn part of office
life. Add to that the time delays these devices cause, the frustration when they
don't work prop-erly, the feeling of subservience that comes from having to remove
gloves and glasses, speak dis-tinctly into a microphone, present a clean hand, or
hold one's face immobile, and you will find a bunch of people who - even under the
strictest of security conditions - are sick of the whole damn thing!
Unless there is some incentive for workers to use these biometric devices - for
example if their time cards will be punched depending on the time they register in,
or if their actions are being moni-tored by guards - unless there is a motivation to
follow the rules, you know very well that everyone is going to try their hardest to
break them. People like showing how friendly they are. People like to show that
they are not a part of the stupid bureauc-racy that runs the place - they like

holding doors open for others, even for strangers. They don't mind allowing others
to use their own clearance to gain access to a room. Nobody wants to look like she
is so caught up in protocol that she has ceased being a human being! And after a
while, people don't Re that their humanness has been reduced to a digitized picture
of their thumbs, or the snaky red rivers in their eyes.
So, you will sometimes find these costly ma-chines turned off and unplugged.
You'll find gar-bage cans placed in the doorways to prevent them from shutting
anyone out. You will find helpful, smiling personnel who will open doors for you and
hold doors open behind them to let you through -even when they've never seen you
before in their lives.
91
Look what has happened here, and what does happen: the most effective way of
ensuring user legitimacy is overthrown by the users themselves. Well, that's good
for you, the hacker. Don't abuse the access that has been offered you by being
mali-cious in your explorations of the facilities you find laid out before you.
Always A Way
Think about the enormous amount of power government possesses over us. Think
of the billions of dollars it can spend to pry into our lives, to pho-tograph us, record
our movements and our daily activities. Think of all the expertise available to such
a powerful entity. Anything that government - or big business, or anyone in power
for that matter -wants to know about, wants to happen, or wants to change, will
become known to it, will happen, or will be changed.
When we start to think about all the covert ac-tions going on around us, and all the
myriad ways in which we don't even know we are being ma-nipulated or spied
upon, we begin to think of gov-ernment agencies as unbreakable, unstoppable...
unhackable. And even if we think we have a chance at hacking it, we know we will
end up in prison.
But all of that is simply untrue!
Government agencies are limited in what they can do and in what they know. You
only have to look as far back as Operation Sun Devil a few years ago, when Steve
Jackson got his games taken away because they were thought to be a menace to
socl-ety. Sure, the Secret Service and the FBI may be powerful, but maybe they
arefeeble-minded too.
We read about all these scary spy gadgets that have been developed that can read
our lives like a README.DOC. We hear about the "impenetrable" government
computer systems that have been set UP, and we are scared away because they
sound so hermetically protected. For example, we know that any transmission of
an interesting nature has a 100% chance of being intercepted. Therefore, all those
spy guys in Washington have set up ul-tra-secure network links in an effort to
protect their valuable secrets. Their most safeguarded lines are fiber-optic cables
buried deep below the surface of the earth and sealed in gas-filled pipes. These are
strictly isolated systems - no connections to outside phones or computers, so no
hackers can gain access by dialing in. Even if a hacker were to dis-cover where the
(unmarked) underground lines are, and even if that hacker were to manage to dig
down undetected, and cut open the pipe to tap the cable, the drop in gas pressure
instantly sounds an alarm.
This is heavy protection, and sounds like it would be impossible to hack, especially
when you realize that even if there were some way to get at those lines, you still

need various levels of permis-sions, passwords and access codes to reach the
highest and most secret classifications of data.
But think again. Never forget that behind every complicated system, is nothing
more than some human beings. And what are human beings if not fallible? In the
case of this seemingly impenetrable system, we can imagine the humans who sit
night after peaceful night, watching their TV monitors, waiting for the alarm to
sound that signals a breach. They're probably asleep more often than awake,
especially if the temperature and humidity is high in their work area. If ever the
alarm did sound, they probably would ignore it, or wouldn't know what to do. Or
they would take a quick look out the window and go back to sleep.
Even if the guards did go out and check the wires to make sure everything was
okay, do you think they would continue checking them after five or six false
alarms? "The boy who cried wolf' trick always works, especially on a dark and
stormy night. No guard is going to go out sloshing through the mud and rain to
investigate an intruder he knows won't be there. There is always a way. Don't be
fooled by first appearances.
And here are some more ways you can beat the security:
Acting For The On-Site Hack
On-site hacking requires some acting ability -the ability to act like you have a valid
reason for being where you shouldn't be and undertaking questionable activities
while there. There's nothing difficult about this - just pretend you own the place.
Strut down the center of hallways holding your head high. Smile and say hello to
the people you pass. I learned this trick in school, where we needed hall passes
while classes were in session if
92
we wanted to leave the classroom. All throughout junior and senior high, I never
got stopped once by a teacher or hall monitor for not being in class, simply because
I acted as if I was on some official mission for the principal. (It helped that I was a
"good kid.")
So do your best to keep your cool. Have a reasonable story prepared in case you
are stopped and questioned, and try to tell it without fumbling for words. Here's a
hint to help you do that.
After rehearsing a story in your head for the umpteenth time and finally repeating it
aloud to a security guard, the quickness with which words come to your mouth may
seem to you to be too well-prepared, too fake to your ears, and you start throwing
in "uhhmm"s and "uhhhhh"s to slow yourself down. Don't do that - it sounds really
bad and it takes away from your credibility and sincer-ity. Talk at a normal pace.
Say your prepared script without worrying if it sounds fake. And throw in some
company insider lingo or gibberish to give yourself an extra believability edge.
Piggybacking
There are two kinds of piggybacking. Electroluic piggybacking is dialing up a
computer and finding yourself connected to the account of the last person who
logged off. Physical piggybacking is using another person's access to gain entry to
a computer or computer room.
One way of getting in at hospitals, offices and other buildings which require the
insertion of a magnetic card to gain access is to stand around and wait for someone

with access to open the door for you. Many offices stay open late at night and on
weekends, for people who need to come in to clean or work overtime. I especially
like going into big office buildings on Sundays. Just wait around outside until you
see a car pull up, then time yourself so you will be behind the employee as he or
she heads toward the door. Let the person unlock the door and hold it open for
you. If you can get in, the whole building is yours for the asking. There may not
even be a maintenance crew around to get in your way.
The thing is, though, you have to plan ahead to be successful at this and not arouse
suspicion. If you're going to try piggybacking your way into an office building,
dress like an office worker. Perhaps carry a briefcase or a lunch bag.
I know these things are possible because I have done them. I spent last week at
the regional head-quarters of a large bank, doing temporary work for them. From
the moment I drove into the parking garage I was inundated with all sorts of
warnings about security measures. First there were the signs hanging up in the
parking garage about how my car would be towed if I parked there without a
hangtag. A guard was sitting in a little booth near the entrance of the place. I
went over and explained to him that I was a temp worker and I didn't have a
hangtag. He told me not to worry about it, that they don't really tow cars unless
there is some problem with them, like if they are double parked.
Then I went into the building, up to the seven-teenth floor, and came out of the
elevator facing a locked door that required a magnetic card to get in. A sign
informed me that I was supposed to buzz the receptionist and have her open the
door for me, but there was no receptionist sitting at the desk. I waited a few
moments until an office worker ap-proached the door from the other side, held it
open for me, then went on his way.
The entire week I 'got in and out of the office without a security card, and in fact
later on I even found a concealed door that allowed entrance to the same offices,
without a key or card of any kind.
So you see, piggybacking - the use of another's legitimate access to gain entry into
a building or computer - is an on-site hacker's best friend!
Other Successful Tricks & Antics
There have been hackers (and thieves and spies) who dress as one of the
maintenance crew to get into a place and get closer to the computers there. Grab
yourself a ladder and a can of paint, and see if there's any work you can pretend to
be doing. This sort of impersonation works best in large companies where no one
will question you, because everyone assumes you're there because someone else
wants you there. As long as you act like you belong, you will be accepted.
One hacker/spy completely re-wallpapered the employee lounge while learning
codes, names, and procedures over a five day period. You may not have the
stamina or the patience to invest in a
93
scheme such as this, but similar actions can be worked effectively on a smaller
scale. Besides, you may find that you're suited to being a delivery boy or sandwich
girl for a few days.
You can gain access to dozens of offices by signing up at a few temporary agencies.
Then, even if the jobs you are assigned don't take you near a computer you will be
able to later use your temp-ing as justification for a return visit to the site. That is,
you wouldn't necessarily come out and tell people you're there on another

temporary as-signment - you would let them think it, mean-while roaming freely
around the building.
Cubicles are great - I love cubicles! Because once you're in one of those gigantic
gray ice-tray rooms, you have the entire area to explore: no locked doors and lots
of comers to hide behind. If you ever trespass into an office of cubicles, you can
roam from one cube to the next, finding passwords taped to ink blotters and stuck
to walls. You can find pictures of kids, people's names, hobbies, etc., from which to
guess more passwords. You can eas-ily eavesdrop and find out inside dope on
people, as well as shoulder surf with ease. Yes, to a hacker, those yucky gray
cubicles can be wonderful!
Sometimes you will be trying helplessly to hack an on-site computer, but for
whatever reason the data you type refuses to be entered. Note that on some
terminals (or computers), non-standard data entry keys are used. Thus, instead of
pressing Re-turn or Enter following a command, you type Fl, or Home, or Insert. I
know, it's crazy, but I've seen it.
On-site hacking doesn't only have to imply the hacking of computers behind closed
doors. In air-ports one can often find unattended terminals. Step behind the
counter and you can hack until you're chased away.
Before concluding this section on the hacking of private and on-site computers, I
want to touch on an area that is connected to the subject by a tenuous thread.
Electronic Passive Computing
I don't like to use the term, but active computer hacking can be thought of as a
"sport," or a game that is to be won by the hacker. That's the way many hackers
view this activity of hacking - as an intellectual exercise in which the hacker tries to
out-think either the computer, the user, the Goliath corporation, or the computer
designer.
Passive computing, or "lounging," is like watching a sporting event on television,
rather than going out to the field and playing the game your-self. Passive
computing is the act of eavesdropping - monitoring computer usage and
surreptitiously collecting the information that is transferred.
In seventh grade I was amazed, the first day of my intro to computers class, when
the teacher told us that each of our Apple computers were con-nected to his. Thus,
by a flick of a switch he could send any of our screens to his computer monitor, to
make sure we did the work we were assigned and didn't goof off. He was screening
our screens! Some paranoid bosses do just that to their employees to-day, to make
sure they do the work they're as-signed.
Actually, it's no great technological feat to con-nect two or more monitors to the
same computer and switch between them. If you have access to the computer your
target will be using, you can attach an RF adapter to the back and secretly run the
cable to another monitor or television set. Then sit back and watch as what occurs
on your target's screen unfurls on yours. You won't get to see your target's
password, since it will be covered by asterisks, dots or spaces as it is typed - but
you can get other in-formation this way. This is a good technique if your target has
a lot of encrypted files for which you don't have the key. Monitoring your target
like this will let you read whatever he reads; and if he de-crypts his files, you get to
read them, too.
It may not be possible to sit down close to the target at your own monitor and
watch. You may have to attach a broadcaster to the RF connector, and listen from
outside the building with a re-ceiver, which in turn is connected to a viewing
screen.

If you hook up a VCR to your monitor, you'll get a hard copy of your target's
activities. It may even be possible to directly connect the VCR to the computer
your target will be using. If you do so, it is best to have a remote way of turning
the VCR on and off, so you don't record while the computer is idle. If the target has
a regular schedule you can simply program the VCR to tape at a certain time.
There's no law saying all screen output has to go to a screen - if for some reason
you can't use any of the above techniques. An alternative is to
94
have information sent to a printer buffer. Make sure that either the printer is fast
or the buffer is large. Otherwise the target's computer will slow down tremendously
and he won't know why. Also, of course, the printer has to be located far away
from the target, preferably in another room or an-other building entirely.
As an example of one limited way in which this can be accomplished, consider the
"print from key-board" option found on many word processors. "Print from
keyboard" causes that several thousand dollar machine to act like any old junky
typewriter, printing characters directly as they are typed on the keyboard.
While your target slips away from his word processor for a coffee break, you can
slip over and activate the "print from keyboard" feature. From then on, anything
further he types within the pro-gram will be sent to the printer. As I said, this is of
limited use, but it shows one more way that even impromptu situations can be
exploited by the cornputer-knowledgeable investigator.
By printing "Shift-PrintScreen" on any DOS computer, the "print from keyboard"
mode will be activated. However, if the printer is not ready, the system may hang
up.
As an example of passive computing which is really very active, in that hacking is
required, it might be reasonable to log on to a network and use programming to
direct the target's output to your own terminal. If you have the target's password,
the host computer would have to be tricked into allowing the same user to be
logged on twice si-multaneously. Additional programming might be required if the
computer refuses to send the target's output to your screen, or if the target is
getting your output.
If you have a password other than the target's, some programming could send the
target's screen to yours, or yours to the target's (if you want to get into
simulation). On UNIX systems, you would be thinking in terms of altering already
existing pro-grams such as TALK or WRITE to get the job done. These two
programs induce a link between two separate accounts. Any time two accounts are
joined, there is a potential for misuse of that link-age. But these programs are
written with security in mind; the hacker's job is to rewrite the programs,
eliminating the security measures.
Another option is to make use of monitoring software which is commercially
available - or write some yourself, to satisfy your own personal needs. Managers of
offices routinely spy on their secretaries, data entry clerks and other computer
operators through the use of software which stores key presses. Other monitoring
software keeps track of which programs are being used and how, often time-
stamping such information as well. Doing this form of research does not, as you
might at first think, necessitate going back to your target's com-puter to see what
keystrokes have been recorded. I hot-wired one such keystroke-capturing program
to print a weekly report to a hidden directory. When secretly installing the program
(visiting the site, posing as a confused user who had a vi-rus-attacked disk that
needed repairs), I also al-tered the computer's startup file which executes upon

login. I altered it to look for that hidden re-port on certain days and e-mail it to me
through an unknowing third party. Now I get weekly reports on this one poor
system manager's every last key-stroke!
I didn't think of it at the time, but it would've been a good idea to add a few lines to
the startup batch to look for the existence of a piece of mail from me containing a
few key words which would signal the program to remove all incriminating files and
program lines from the computer.
You might ask, "Why would you need such a thing - don't you have the guy's
password and everything from reading those weekly lists of his keystrokes? You
can delete the evidence yourself." Good question, and actually I do have his pass-
word, but it took a long time to get it.
You see, the keystroke-capturer can only go into effect once the user has logged in
and the startup file is executed - by then there is no need to enter one's password.
(You can tell that even though I put a lot of thought into this hack, there were a lot
of things which I didn't ever consider be-fore the actual results starting coming in.
Hacking often involves making assumptions and then see-ing how one's
assumptions were wrong.) It took awhile, but eventually I did get the password,
when the system manager invoked a second sub-shell within his logon.
Tapping the phone line or intercepting micro-wave transmissions are always open
options, or bugging the phone if the modem is coupled to it.
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Then you get the added bonus of hearing the tar-get's voice-phone conversations as
well. Printer, modem, monitor, and other computer cables can also be tapped to
good effect. One nice method is to tap the modem line, making a recording of any
modem calls that take place. You go home, call the number that the tapped
computer called, and play back the recording for the remote computer to hear.
Remember, the high-pitched squeals and cries in the recording you made will
include that lawful user's access codes. Your goal will be to synchro-nize the
playing of the recording with the remote computer's prompting. If you can get it
right, you get yourself in.
You know, once someone gets their computer all plugged in and set up, it is only on
very rare oc-casions that they ever look at the backside or un-derneath it again,
especially since they probably have a messy tangle of cords running out the back,
an office cleaning staff to keep it dusted, and the back of the computer pushed
against a wall. That RF adapter or extra wire coming out will surely go unnoticed
for a long while.
Radiation Comprehension
If you like to watch television while you use your computer, you may have noticed
something funny happening when the channel is turned to certain stations. With
the computer on, channel two on my television is complete static, while channels 3
and 4 get decreasingly snowy. This happens when electromagnetic fields radiating
from my computer and cables are picked up by the televi-sion antenna. If I'm
watching channel 2, 1 can even make out a very fuzzy representation of what I see
on the computer screen.
There is a simple reason for this happening. The various components of a computer
- amplifiers, cables, the coupling between cables, the power supply to power line
coupling, switching transis-tors, the ground loop, internal wires, and even printed
circuit boards - all act as antennae to con-duct electromagnetic radiation. The

components, cables and whatnot will not only pick up the radia-tion, but transmit it
as well, sometimes re-emitting it at some distance from the source equipment.
Nearby electrical wiring and metal pipes can further act as antennae.
Computers operate at radio frequencies and so they are also radio transmitters.
That's why the Federal Communications Commission must ap-prove all computers
(and many other electronic appliances) before they can be sold in the United
States. The FCC wants to make sure those radio emissions aren't strong enough to
interfere with other licensed radio receivers (such as television sets). In fact, there
have been cases of unregistered computer monitors whose screens have been
picked up on the next-door-neighbor's television set. This sort of thing is more
likely to occur when the neighbor has a black and white television and the computer
has a composite monitor, because a black and white set can more easily adapt the
syn-chronization signals that it picks up from a com-posite monitor (especially if the
TV has an antenna amplifier attached).
When my television receives computer fre-quencies, it is doing so accidentally.
Imagine the consequences of someone setting out to purposely receive radiated
information. Indeed, such a thing is possible, and has been going on for quite some
time. For years the Department of Defense has stashed away its most hush-hush
computers and communications devices in copper-lined rooms to prevent radiation
leakage. They have also pro-duced guidelines for a security standard called
TEMPEST ( Transient Electromagnetic Pulse Emanation Standard. ) which defines
how military computers are to be constructed so that the radiation leaking from
them is minimal.
Special military computers might be well pro-tected, but your run-of-the-mill PC or
terminal is not. The FCC ensures that equipment won't inter-fere with other
equipment; it makes no promises that equipment is safe from prying eyes. In fact,
those eyes don't even have to be at the scene of the crime. There is an electronic
marvel called the Van Eck device which picks up your favorite leaked radiation and
projects it onto a television screen. Hook up a VCR to the television and you've got
a living document of everything that goes on in your target's computer account.
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Van Eck And Britton
In 1985 a group of Swedish engineers, led by one William "Wim" Van Eck,
presented a paper called "Electromagnetic Radiation from Video Dis-play Units: An
Eavesdropping Risk?" at the Securi-corn Conference in Cannes. The paper, which
was published in Computers and Security 4, described how one could easily and
inexpensively convert a normal television set into a non-trespassing, pas-sive
device to intercept and reconstruct the infor-mation from any digital device, most
notably com-puters. Scientist Don Britton had already gone public with a virtually
identical device in 1979, but it was the Van Eck paper that got people to sit up and
take notice.
We were talking before about how you could set up a radio receiver to pick up the
mess of sig-nals coming from cables, wiring and circuit boards. This is possible,
yes, but you would end up with an unintelligible mishmash of signals. It would be
dif-ficult to separate and decode the various signals -though not entirely impossible.
Doing so would enable you to determine what a distant computer was "thinking" as
those electrical pulses shot through its system.
"Pulses" is the key term here. We all know the story about how computers are
digital beasts, proc-essing streams of ones and zeroes to create the fabulous

tapestries of color and sound that we get to appreciate every time we boot up a
copy of the latest Sierra game.
In reality, there aren't actually tiny Is and Os coursing through the wiring. What's
going on is a high or low electrical current passing through. We think of these high
and low currents as being Is and Os because it is convenient for us to imagine them
this way. Any electrical device is going to have radiation emissions. But only a
digital device, like a computer, will have pulses of high and low. Keep all this in
mind while we take a little side trip.
Computer screens operate on the pointillist school of display painting: what you see
as con-tinuous shapes and lines on the screen is actually composed of thousands or
millions of tiny dots, called picture elements, or pixels for short. Each dot is a little
speck of some substance that glows (fluoresces) when energized, and the inside of
the screen is covered with the stuff.
Video control circuitry located either within the monitor or plugged into the
computer, controls the position of an electron gun, which repeatedly scans the
screen top-to-bottom, firing an electron where appropriate to energize a bit of the
fluorescent sub-stance. Light up the appropriate pixels and keep them lit, and you
end up with glowing dots that can combine to form the lines, characters, symbols
and graphics that make up our daily experience with visual computer output.
You may ask yourself, "Well, once a pixel is lit up, how do you darken it to clear
that portion of the screen?" The answer is simple. Hitting the phosphorescent
matter with an electron only pro-duces a very brief burst of glow before extinguish-
ing. That's why the electron gun must systemati-cally scan the entire screen sixty
times a second to constantly refresh the image appearing on it. If we wish to
cancel a pixel or series of pixels, we simply discontinue firing an electron at that
section of the screen.
Every time the beam fires we get a high voltage pulse of electromagnetic emission.
Britton's and Van Eck's idea was to simply use a television re-ceiver to listen for
those bursts of high voltage as a monitor emits them, and have the television re-
spond by firing a pixel in the corresponding place on its own screen - thus ending
up with a display screen that exactly matches, pixel by pixel, that of the target
computer.
A good thing for a spy to have, huh?
The problem is that while a television can receive those bursts of high voltages,
they don't know what to do with them. There's nothing inherent to a high pulse
that signals where on the receiving television that pixel should go. <Actually, such
signals are readily available from the mishmash, because the originating monitor's
synchroni-zation components also generate signals as they func-tion. However, the
pulses are too weak to pick up from a distance.>
The Van Eck or Britton devices bestow this function upon any lowly TV receptor, by
producing an artificial syn-chronization signal. Two adjustable oscillators are used
to create the vertical (picture) and horizontal (line) synchronization. For technical
reasons, proper reception requires a constant re-tuning of the oscillators. This
could theoretically be done by hand, but this is the computer age: the signals are
97
mathematically combined and fed into a logic cir-cuit which performs the job
automatically.
The difference between Britton's and Van Eck's designs are that Britton based his
system on United States NTSC technology, while Van Eck's model is based on
European PAL receptors, using European voltages, and includes a built-in digital

frequency meter. If you have the tech knowledge you can build one of these for
$10 to $15.
Models are also commercially available through spy shops.
Besides the oscillators and the logic processing sync restorer board, you will want to
hook up a di-rectional antenna to help focus in on exactly what you're after.
Someone using one of these devices should be able to fine-tune their receiver to
the point where multiple CRTs within the same room may be distinguished. This is
due to differences in the components making up the monitors. Pieces that come off
of different assembly lines or from different countries will have varying radia-tion-
emitting characteristics. Your suitably engi-neered Van Eck or Britton device can
discriminate between the several traits presented. Just pick one line of signals
which you wish your machine to follow, and off you go.
Ups And Downs
This method of on-site computer cracking is safer than most because it involves no
trespassing at all to get at your target computer. Van Eck has reported that he was
able to use his invention to view the contents of computer screens from dis-tances
over a kilometer away. His working group housed the device in a van which they
parked on the street, usually right in front of a target's home, without incident.
These devices give us hackers the opportunity to do what we always say we want to
do - innocently look around in computer systems without hurting, without changing,
without destroying. But Van Eck and Britton machines also deprive us of freedom
of direction, of choice. We can only use it to see what the user himself sees; there
is no chance for us to hack, only to spy. Very rarely do pass-words appear on a
computer screen, so we most likely won't even be allowed the opportunity to use a
bit of learned knowledge to coax what other excit-ing information we can from the
system unless the user chooses to allow us entry into those secret realms.
Seeing the contents of a forbidden computer screen from a kilometer away is
marvelous in and of itself when one is discussing, as we were, pulling flutters of
distant radiation from the ether. But tra-ditional hacking methods - through the
telephone - allow us to delve into the forbidden from much further away than a
kilometer. In the following section we will start looking at how a hacker can roam
through all the confidential computer systems of his neighborhood, his country,
and, if he chooses, the world.
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Chapter Nine:
Hacking At Home:
Dialing Up ComputersWith Your Modem
Now we get to the stuff of which dreams are made. You flick the switch on your
computer and a few moments later it's purring away.
You press a few keys, type in a phone number and after some beeps you hear the
wonderful shriek of connection. The handshaking is fine, but you're looking for a lot
more than a handshake.
You press Enter a few times.
"What's your name?" it asks. You respond - not with your own name of course -
with someone else's.
Then you let your fingers whisper that sweet secret word through the keyboard and
the screen lights up with a luscious display.

Menus! Options! Choices to be made! Files to read and to learn from, software to
run, games to play. You let the directories sift past you, letting yourself be
mesmerized by their framework. So much to do, and then you see connections to
other sites, and more sites, and more secret files to read! You smile as you realize
something: every hack, no matter its size, leads to new hacks, new computers, new
horizons of exploration and gain.
Reality
When I say "Hacking at Home" I don't really mean it. Most computer hackers
nowadays won't hack from their houses for fear of Caller ID, line tracers, tricks,
traps and federal agents. When I say "Hacking at Home," what I'm really referring
to is the phenomenon of dial-in lines. Ways in which, if you are so inclined, without
even leaving your house, you can connect yourself with the world.
Who To Connect To
Who can you expect to connect to, calling from home? Lots of places. There are
other home com-puters,
mainframes, minicomputers, companies, government offices, clubs - you will be
able to call any organization or individual who owns a computer, and has need to
communicate via computer with other entities.
You might also find yourself calling on-line databases and pay-for-play services.
99
Paying For The Pleasure
A hacker named Rebel was recently telling me how enthralled he was with
CompuServe, except for one aspect - the stiff price one pays for using the service.
For this reason, CompuServe is often known as Compu$erve, with an oversized
dollar sign replacing the S. CompuServe is not the only vendor charging the public a
fortune to pay back their huge advertising budget. There are literally hundreds of
on-line services to which one may sub-scribe, or hack one's way in if that's more
your style.
Databases are available to look up any sort of data: census data, news, stock
market information, results of government research, science and tech-nology
reports, books, personal information, his-tory, and popular culture. There have
been times late at night when I needed one crucial piece of in-formation for
something I was writing, or just to satisfy my curiosity. Anybody can access one of
these databases and find what he or she needs any time of the day or night. Of
course, we must be prepared to pay through the nose. There is usually a charge to
subscribe to the service, then there may be any number of the following charges:
A display charge for each piece of data pre-sented on the screen, or a search charge
for each query made to the database.
Minute-by-minute charges as long as you stay connected to their computers.
High-speed surcharge for using a faster modem (thus gaining the ability to grab
more info per minute).
Long distance phone charges if the service doesn't have an access number in your
local-dialing area.
Many hackers refuse to pay the inflated bills

these services can run up, though they also refuse to give up the service,
particularly when so many special and useful features can be gained by dialing in.
On-line gaming, electronic mail, multiple-user chatting, bulletin boards<Many of the
fee-based services which offer bulletin boards even have a message base or two
devoted to hacking.>and a plethora of other goodies make the services attractive to
the hacker. The many ways to get past paying for them are also very attractive.
You will find many ideas through-out this book.
You'll be interested to hear about one trick a pair of high-school-age New Jersey
crackers used to get some service for free. One brand of personal computer was
being sold in a special package that included several pieces of software, along with
a trial membership to one of the on-line services. They hacked the system of one
of the stores that sold the computers and obtained a list of customers who had
bought it. Many of those customers were individual people or families, but a good
number of the computers had been bought by stores and busi-nesses. They went
to these businesses and snuck around in their back rooms and offices. Sure
enough, pushed aside on bookshelves, unopened and untouched, lay the envelope
that included the "Getting Started With StarBase On-line" manual and trial access
codes that had been included with the computer. They helped themselves.
Packet Switched Networks
There are corporations an government agen-cies all across the country that have
computers you will want to get your hands into. But you're not going to want to get
your hands into your wallet to pay for all those long distance calls. The solution?
Public Data Networks (PDNs).
A PDN is a network of hundreds of computers scattered nationwide. You call up one
local to you, then type the address of the computer system you want to connect
with. The "address" is usually something like a phone number. When you enter a
valid address, the login display for the desired sys-tem will appear. You are then
able to interact with the system as if you were directly connected to it, when in
reality everything you type is being bro-ken down into chunks of text (packets),
possibly compressed and encoded, then shipped across the country, from one
computer to the next, until it reaches its destination.
There may be hundreds of other sessions going on simultaneously from points
throughout the net-work, as thousands of users interact with the many computers
on the net. Sending messages this way is known as packet switching. The
intermediate computers that do all the work are called PADs, or Packet
Assembler/Disassemblers, because they
100
take incoming packets of data, strip away the en-coded insulation which tells that
PAD where the packet is headed, then reassemble the data with new directional
information, sending it further along the route.
Hackers take great glee in connecting with a PDN. Once there, a hacker can try out
various ad-dresses at random. In a matter of minutes, he will find himself with a
wide variety of login prompts to crack, all made through a local phone call.
The most well-known PDNs are Telenet and Tymnet, and there are also
international packet networks, and networks in other countries as well. Generally
you can call any one of these services to get a list of PADs in your area you can dial
in to.

Other Networks
The only other network that counts is the Internet.
Internet is an international network of net-works. There are academic networks,
government networks, businesses and organizations throughout the world, all
connected together (by PDNs) to ex-change ideas, software, technologies, gossip
and guacarnole recipes.
Before Internet there was ARPANET, a military network which has since been
replaced by MILNET (a well-guarded network of United States military sites) and
other smaller networks used by the US military. Altogether, these make up DDN,
the De-fense Data Network. DDN is now just one of many networks participating in
the Internet.
Others include the National Science Foundation NETwork (NSFNET), which includes
supercom-puter centers and other research sites funded by the NSF. CSNET is a
network established to encourage cooperation between sites doing development
work in computer science. JANET is the United Kingdom network, one of many
national networks around the world that is bridged with the Internet. Internet is
truly a global community.
Some of the pay-for-play services offer access to the Internet. Many university
computer accounts are connected to it. Basically, having an "in" with the Internet
allows one to travel around the world and back without leaving your armchair.
We were talking before about packet switched network addresses. An Internet
address is a series of code words punctuated with periods, and refers to one
particular computer in the millions that make up the Internet. A typical Internet
address might be "danielk@cs.zowie4.uboulder.edu." We can deduce that at the
University of Boulder there is a computer in the computer science department
called zowie4, and on that computer there is a per-son whose first name is Daniel,
and last name be-gins with K. The "edu" is a standard thing stuck at the end of
educational computer addresses. Other identifying components used are:
COM for commercial sites,
MIL for military sites,
GOV referring to governmental organizations,
ORG for non-profit organizations, and
NET meaning Internet administrator sites.
An Internet address may also end in a two-character country abbreviation. Some
exam-ples of these are:
AUAUstralia
IL Israel,
US United States
JP Japan
UK United Kingdom
DE Germany (tricky! DE is for DEutschland).
Finding Dial-Up Numbers
To "direct connect" with computers, you will need their phone numbers. Very often
you can call up a company and ask the switchboard operator for the computer
department and/or computer lines. If that doesn't work, try calling individual of-
fices at the firm and ask if they know how to access the company computer from

their home computers. If they don't know the phone numbers, perhaps they have a
terminal program on their office com-puter which has the phone number stored for
use.
Phone books are a big help. First there are the internal kind: companies and other
organizations will have a directory of people who work there, with their extension
numbers. Internal directories might also be of the kind that list numbers for the
different departments; some go so far as to list home phone numbers and
addresses of the people who work there. Names can be used to pretend
101
familiarity with the people you speak to when you call. But you won't even have to
call and ask for dial-up lines if those numbers are listed in the di-rectory.
A second useful source is phone company data grade line directories....
When a person speaks on the telephone, it doesn't matter if every once in a while
the voice on the other end gets a bit fuzzy, or if the tone gets momentarily higher
or lower. When you're trans-ferring data between computers, however, audio noise
can be a problem. So the telephone company has special lines which offices can
install (for a price) to ease the flow of data between telecom-munications devices
such as moderns. If you can et a data grade line telephone book, you will have 9
found a huge and wonderful collection of computer phone numbers (and fax
numbers too). Many hack-ers get theirs by scavenging.
The third way phone books can be helpful is by looking in the public white pages
and yellow pages that every phone owner gets for free. Large corn-Panies will own
big blocks of telephone numbers, with each office or extension being one digit
differ-ent from the preceding one. To call the different departments at Company J,
you would dial 390-WXYZ. The 390 stays the same for every de-partment, but the
last four digits change for each phone line. So turn on your computer and type up
a text file listing every occurrence of those last four digits you see listed for that
company in the phone book. Then sort the list and try calling everything in that
exchange that is not on your list.
It can be helpful to use a criss-cross directory for this task. Criss-cross directories
are sorted by number, not name, so if you know that Company J's numbers fall into
the 390- range, using such a direc-tory you will have an even bigger list of numbers
to avoid. This makes the job of calling every potential number much quicker and
easier.
Software is available to repeatedly dial up a se-ries of phone numbers, reporting on
whether a mo-dem is connected. These programs, often available on hacker and
cracker BBSs, are known by many names: "WarGames Dialers," "autodialers," or
"demon dialers." If you can't find such a program, write one for yourself; it's simple
to do and will cost you only a few hours of time.
Once you have your autodialer, be very careful how you use it. The phone
company security patrol
knows what you're doing when you make that many calls that quickly, and with
such precision. I've often thought it would be a good idea to com-bine one of those
computerized telemarketer ma-chines with an autodialer. That way everything
looks legit: if a person picks up, they get a short re-corded message: if a modem
picks up, they get a callback later.
Dial-Up Security Measures

Some security directors get themselves into a bind. They recognize the important
value of having direct dial-up lines for easy access, but they also understand that
anytime a person is able to call a computer directly, a security breach is not only
possible - it's unstoppable.
To overcome this, security-minded folk will not allow direct dial-up access to the
real computers. They will only allow access to an intermediary de-vice or computer
which firewalls important data from potential hackers.
For example, one may dial-up a computer whose purpose is only to check
authorization codes. When access is confirmed, the caller is trans-ferred to a line
connected to the actual computer. There, the caller may have to identify his or her
private account by username and password. As long as the password to the initial
computer is kept secure and changed frequently, the important data on the actual
computer is free from harm.
In states where Caller-ID service is legal (and even in those states where it is not,
or isn't avail-able) it is possible to set up a modem to only hand-shake with a user
who is calling from an authorized phone number. The system administrator keeps a
list of the home phone numbers and office numbers of legitimate users, and if the
computer sees that the incoming call is not from one of those, there is an
immediate disconnect. The call would also be disconnected if the caller had enabled
Call-Blocking, which disallows the Caller-ID from reading one's phone number.
Where Caller-ID is unavailable or unknown, a ring-back feature may be put to use.
Once a caller inputs correct identifying information, the host computer disconnects
and calls back a stored tele-phone number which goes with the identity that has
been entered. This is the normal way ring-back
102
works, but in some instances (such as the RBBS-PC electronic bulletin board
system) the ring-back op-tion means that a caller lets the phone ring X times, then
hangs up and calls back again. This time the BBS will answer the phone. If the
caller had origi-nally let the phone ring more than X times, the computer would
have ignored the call completely, thus providing a layer of security. So if you have
a number you know belongs to a computer, but there is no answer, try letting it
ring a different number of times, then call back immediately.
A host computer may also not connect a caller until a certain code is played on a
Touch Tone phone. Since the code would ordinarily be played by the terminal
program of the calling computer, this code may be very long and complicated, thus
difficult to crack by chance or force.
As you can see, all of these dial-up security measures make life difficult for the
hacker. One may social engineer the knowledge out of a legiti-mate user of the
system, but often the hacker won't even know that such extreme security measures
are in effect to begin with.
You may be randomly dialing through a range of phone numbers because you have
reason to sus-pect that a computer line exists within that range. If one of the
numbers is never answered no matter how often you call, you can surmise a ring-
back or similar device is connected to the other end. If you call one number and
hear a computer at the other end but aren't connected, suspect that the computer
is looking at your phone number and seeing if it's valid.<A knowledgeable hacker
could temporarily change his phone number to one that the computer recognizes,
by hacking the telephone system mainframes. However, it is still necessary to
know that phone number.>

(Either that, or what you're really trying to connect to is a fax machine.) Caller-11)
type sys-tems, and those which call back a phone number, will be especially
common on computer systems whose users are situated within a close regional
area. The remote system may also be trying to de-tect special tones encoded in
the modulation. Though it is a dial-in line, special equipment may be needed to
connect with it.
Sometimes the system managers get so tricky as to disguise the fact that they
have a dial-up com-puter available at all. When a user calls up to use the
computer, a special device answers the phone.
Instead of hearing the characteristic modem noises, a user might get a recorded
voice, static, or nothing at all until a specific password is sent from the calling
modem to the remote system. You can see how this would easily foil any
WarGames dialer.
AD in all, devices which inhibit access to the ac-tual computer are nothing more
than one more layer of security to get by. Luckily, the majority of computers do
not employ such tactics, and are easier to crack than a hard boiled egg.
Scrutinize The Login Environment
The login environment is the area of the remote computer which you are allowed to
access before identifying yourself as a valid user of the system.
The login environment of most computers is limited to a username and password
prompt. Some environments are more expansive, giving a general command
prompt, at which you can type any number of instructions. Those instructions
won't necessarily be carried out (you probably have to log in first) but they can be
helpful.
There are a number of common commands that one can type at a board command
prompt, and a list of these is given in Appendix C. Try typing "help" or "T' first, and
see if that does anything. A command like "users," "show users," or "who" will be
helpful, in that you can see the names of people who are on the system and try to
guess their pass-words. The advantage of having certain other conunands may not
be as apparent, nor will there necessarily be any advantage at all to the hacker.
One good thing about general command prompts is that often one is reverted back
to them after failing a login. Thus if three incorrect user-name/passwords are
entered, instead of discon-necting you, the computer will bring you back to the
command prompt for another go-round.
When you find yourself at a general command prompt with no help available, try
doing different things, paying attention to the error messages you receive. Try
entering commands in all upper or all lower case, then mixed cases. Look at the
maximum and minimum lengths of commands. See which characters are
recognized. All of this is helpful in that it narrows down the number of unknowns.
It helps you more easily figure out what you should be doing to get things moving.
If every time you
103
type "HELP" you get a "Line too long" error, then you know the system is probably
looking for three-letter commands. That is useful information.
If you type "CONNECT," and the system re-sponds, "The verb CONNE is not
available" it im-plies that only the first five characters of input are examined. If, on
the other hand, your entire entry is examined, advanced help may be available. For
ex-ample, if by typing "HELP" you get a list of com-mands, typing "HELP

COMMANDNAME" may give you help with that one particular command. Such help
systems are common.
Let's look at the actual entering of usemarne and password. Some terminals tell
you you're wrong when you enter a bad name, others wait until you've given both
name and password to in-form you. The first way is preferable, as it is less se-cure
and requires substantially fewer guesses to crack than the latter. The IBM VM/370
was inse-cure in this regard; it immediately informed you that the username was
no good with a "userid not in cp directory" error message. One system that I know
of (Dynix) follows the same format. First it helpfully prompts for your "Nine digit ID
code" (hint, hint, what could that be? A social security number perhaps?) and when
the correct one is en-tered, it will say, "Good morning Samantha. Now type your
password." This particular computer al-lows you to easily break into one of several
com-mand languages and reprogram the menu inter-face. It also comes equipped
with dial-in ports. Dynix is a joy to hack.
If you get a computer of the second type (one which asks you for name and
password before saying if your login is accepted), then time how long it takes to
display the password prompt on the screen. This can help you decide if a usemame
you're entering is valid or not. Let's say you try the name "Jim," and it takes two
seconds for the com-puter to respond with the password prompt. Every time you
type "Jim," it takes that long. Now try the usemame "Zzzzzzz." This is obviously a
made-up name that the computer won't be able to find in its files. If it consistently
takes longer for the password prompt to appear after typing the name "Zzzzzzz,"
you know that "Jim" is a valid usemarne, and you .;hould continue guessing
passwords for him. That is, on systems where sequential search is in effect, it
takes longer for the computer to search for a nonex-istent entry in its data files
than an existent entry.
In any case, source codes are often available, espe-cially for UNIX files, and so you
can look them up to see how the inner workings of the login prompts function.
If you have no idea what kind of username and/or password is required on a
particular sys-tem, do the same kind of checking you would do at a general
command prompt, checking for which characters and lengths are recognized.
A completely different way you might like to research the login prompt is by control
codes. Pressing certain keys, or combinations of keys, delivers codes to a remote
computer which may force it to act in ways that it was not meant to behave. For
example, you can send an ASCII code to command the remote computer to stop
reading a password file. Sometimes it is then possible to quickly retype the
password you entered, and make the computer believe it has found your input as
part of the password file, thus letting you into the system. Sometimes pressing
Control-Z (the end-of-file command) at the right time will bring strange results too.
Look up all abbreviations, weird letters and other things that appear on the screen.
Any decent library will have an encyclopedia of acronyms. (Any indecent library will
have this book.) Very often you will call up a packet switching network, find a valid
address, then get something like "Welcome to VHMSD! Password?" on the screen.
So, you do your research and find out that VHMSD stands for Viking Horn
Manufacturers of South Dakota, and the whole task of hacking the place be-comes
infinitely simpler. Remember, when you are hacking a computer, you are really
hacking the people that run the computer. Thus, if you can find out who is running
the show, you have a multitude of resources at your disposal, including all the re-
search tools mentioned earlier. Otherwise you're just taking random stabs at a
computer identified only by some strange abbreviation.
104

Chapter Ten:
Electronic Bulletin Board Systems
The Electronic Bulletin Board System (EBBS, but usually referred to simply as a
BBS) is how most people get introduced to computer telecommuni-cations. A BBS
is a computer program that anyone can set up on his or her computer. The
program watches the computer's modem, waiting for the telephone to ring. When
it does, the BBS program answers the phone. If it is another modem calling, the
two computers are connected. The person who is calling is then able to use the
computer on the other end of the line as if he or she was sitting di-rectly at that
computer's keyboard. The BBS pro-gram allows the caller to choose various options
from menus, letting the caller write messages to be displayed to other callers, read
messages, send files back and forth, or play games on the remote com-puter. In
essence, the caller actually controls the computer through the phone lines.
However it is only the BBS program that he or she is allowed to control. The BBS
program separates the caller from the computer itself. At least, it tries to.
BBSs are generally run by computer hobbyists on their home computers, and are
used as a way to share information in the spirit of the original hack-ers. Usually
there is no charge to call these up and look around, but that is at the discretion of
the person running the BBS - the system operator (sysop). Schools, libraries,
stores, user groups, churches, and organizations often run BBSs to spread the word
about activities and to keep mem-bers in touch with one another. Sometimes com-
panies will set up electronic BBSs as a way for cus-tomers to mail order products
from them, to see new product information, or to report problems with products or
services.
The US Congress has even set up a bulletin board system. Run on RBBS software,
the BBS was created in late 1991 by Congressman Bob Wise and his House
Government Operations subcommittee on government information, justice and
agriculture as a way for government employees to anony-mously inform inspectors
about wrong-doing at the workplace.
Other BBSs are private ones, the phone num-bers to which are not made widely
available. For example, the FBI runs the National Crime Informa-tion Center (NCIC)
which makes use of a BBS to keep track of wanted persons, missing persons, and
people with criminal records. Franchise businesses such as fast food places often
use BBSs to upload inventory or financial data to their company head-
105
quarters on a daily basis. And of course, there are otherwise "public" BBSs which
maintain silence be-cause the people who use them do so for illegal purposes.
Access to most BBSs is controlled by a name/password combination. When you call
up a BBS you are asked to enter your name, or NEW if you have not called before.
If you are a new user, you will be asked if you wish to register for the, sys-tem and,
if so, you will be asked some questions, welcomed to the system, perhaps given a
short tour, and shown the rules of the house ("Please keep messages clean... No
discussion of illegal activities such as computer hacking, fone phreaking, stolen
credit card numbers, etc...").
After that, you might be given guest access to the BBS until the sysop can validate
your request for admission, or you might be logged off and asked to call back the
next day. This isn't always the case, of course, but sysops like to make sure you
are who you say you are - if you registered with a phony phone number, they want

to know about it. They want to make sure the people they will be allowing to use
their computer can be trusted.
Electronic bulletin boards are important to the computer enthusiast and to the
hacker for many reasons. They enable us to communicate (possibly anonymously
or serni-anonymously) with other computer users. We can learn from those who
have more experience than us, and we can use BBSs to help newcomers to the
world of computing.
And of course, there are the immoral and illegal ways of using BBSs, ways to exploit
them and the people on them for your benefit, ways to make con-tact with the
underground and deviant computer users of the world, including hackers.
Finding BBS Numbers
Once you find one B13S number, you will auto-matically have literally thousands to
choose from. The sysops of BBSs are not competitive. They don't care if you use
their system exclusively, or if you call up every BBS in existence. Thus, you will al-
most always find a BBS list on any BBS you call. The list may be nationwide or
local, and will detail BBS names, phone numbers, perhaps the sysop's name and
special features of the systems. BBSs also usually have a BBS message center, or
a place where other sysops can advertise their BBSs-
So once you call up that first BBS, you will have the phone numbers for many more.
The trouble, for beginners, is finding that first number.
To start with, if you know anyone who has a computer and a modem, ask them if
they have any BBS numbers.
Many computer users groups, libraries, relig-ious organizations and schools have
BBSs. The companies that manufacture moderns and other telecommunications
equipment, as well as the software companies, often have BBSs. If one isn't
advertised in the packaging, call them on the tele-phone to ask if they have one.
Hayes, for instance, has a nation-wide 1-800 BBS you can call to get product
information and lists of BBSs from all over the country. The number is 1-800-US-
RAYES.
Computer magazines often list BBS numbers. There are many books on
telecommunications, some of which have listings of BBSs across the country in an
appendix. There are also several computer phone books that give listings. Addi-
tionally, you might find BBSs advertised on com-munity bulletin boards or in
neighborhood com-puter stores.
Finding Hacker Boards
The most adept hacker BBSs will not advertise themselves, but don't worry: Once
you establish yourself as a knowledgeable hacker, you will learn of their existence
and they will welcome you with open arms.
There are plenty of hackers and wannabe-hack-ers who will openly advertise their
BBSs as catering to the kind of thing you are looking for. Perhaps they have
worthwhile information. Probably you'll log onto these boards and find nothing
more than some no-brain kids cursing at each other. You can ask on overtly
hacker/criminal boards if the mem-bers know of any other hacker boards (or look in
the BBS listings there), but you probably shouldn't stick around on overtly criminal
boards, as they are more likely to be busted. Since they generally don't contain
anything but publicly-available or useless information, don't feel you're missing out
on much by shunning these places.

106
Occasionally you will find an electronic conver-sation with some intellectual value to
it. Embrace it, add to it, and pretty soon you'll find yourself accepted into its
underground. If you find such a BBS, one whose members proclaim themselves to
be hackers, and yet the conversation is smart and con-servative, you can bet that
there are secret sub-boards lurking behind trap doors, where all the real-hacking
news gets discussed. Prove yourself as a worthy member of the above-ground
community, and after awhile the sysops and assistant sysops will vote you into their
elite society. To be accepted as a hacker you must be willing to exchange infor-
mation. You must have good information to share and to give.
If you log on to a respectable PBS which you suspect contains a secret hacker
subsection, acci-dentally try a different unlisted command each time you log on.
(Don't do more than one per login, to avoid generating suspicion.) If you find a
com-mand that works, and you're asked for a password, then you'll know you're on
the right track. Talk to the sysop or other group members about your feelings on
hacking, and ask them what they think about it. Modestly tell of your hacking
achievements. You will already have impressed them by finding the secret section,
but you don't want to agi-tate them by hacking it out. <One of the criticisms that
law enforcement officers make about hackers is that they say we live by a double
standard: That we think it is no crime to violate other people's privacy, but we can't
stand the thought of being probed ourselves. Well, I don't find a need to defend
myself If a hacker can get through the safeguards I've set up, that's fine, because I
know that hacker will not damage me by it.As far as hacking a hacker BBS is
concerned, since the users of that BBS do not know you, they don't know that your
intentions are honorable. Thus, to invade them is to get their guard up. In your
talking to the sysop you might want to mention that you refrained from hacking the
hole that you found, in order to reassure them that you are a fellow hacker and not
a cop.>
And you certainly don't want to post a public message stating that you found their
trap door; you can bet there are plenty of others without that secret access who are
also roaming about. Talk to the sysop and assistant sysops privately about your
find, via e-mail or on-line chats.
Making Connections
Many of the BBSs you encounter will be strictly legit operations. There will be no
talk of hacking, no trading of break-in secrets, and certainly no sensitive
information of any kind being distributed to newcomers. You will have to start by
jumping into already established, possibly ho-hum conversations.
Be polite, try to be helpful. Add thoughtful comments to the discussion. Having an
experi-enced hacker as a friend will do more to boost your skill in that area than
anything else - except per-haps some persistence, research and luck.
Soon you will have a few favorite systems that you'll call on a regular basis, but you
should also be constantly branching out, trying all the new sys-tems you find, your
goal being to eventually find an access into the "computer underground."
There is no single, organized underground per se, but there are groups of hackers
and others inter-ested in technology scattered here and there. They will keep their
conversations of illegal activity se-cret, so it will be difficult to find them. The
message boards they use to communicate will often remain hidden to the
uninitiated, and the BBSs on which the most interesting tales are traded will not
have their phone numbers publicized at all. Your best bet is to keep searching. If

you start to get the feel-ing that someone on one of the bulletin boards may be
inclined to deviant computing, you may want to send him or her a private message
(tactfully) asking if he or she is interested in that sort of thing and if so, would that
person want to trade information? But remember: any message you send on a BBS
can be read by the sysop, co-sysops, and possibly other system managers lower
down the hierarchy, so be discreet if the people who run the show are antihacker.
A lot of people own computers with modems, and you will run into a lot of different
kinds of people on electronic bulletin boards. If you look in the right places you are
sure to find computer hackers. What may be more difficult is getting them to
accept you as one of their own. Hackers like to show off, but they don't usually like
to ex-plain how they do their tricks. You will have to demonstrate to them that you
are a thoughtful, re-sourceful, logical person who can hack just as good
107
as they can - and one who has information to share.
As you wander through the bulletin board for-est, keep track of where you've been.
Keep a list of the different BBSs, making note of the software used to run each
BBS, and what features are avail-able on each one. Particular features to keep
track of are file transfer capability, extent of BBS list, user lists, and doors.
BBS Features
BBSs are more than just bulletin boards - that is, they are more than just a place to
write and read messages.
BBSs with file/ transfer sections will allow you to upload (send) computer programs
and files to the BBS, and download (receive) files from the BBS computer. Many of
the more serious BBSs have re-nounced file transfers as a waste of good time and
disk space, but this feature is still common, espe-cially with sysops who cater to
software pirates (or bootleggers) who deal in software that has had its copy
protection removed.
There are various kinds of user lists and logs on BBSs. These range from user
responses to a poll or questionnaire, to a little introductory message from the user,
to brief one or two word descriptions of the user's affiliations and interests. Often
usage logs are available; these will let you see who logged onto the BBS before you
arrived there. These usage logs may go back to the beginning of the day, or
farther.
"Doors" are used to go outside of the BBS pro-gram. When you walk through a do-
or (by selecting a command from a menu) you enter a completely different
program. Usually doors are used to play games on-line, but any kind of program
can be ac-cessed through doors. It all depends on the BBS software being used,
and the whims of the sysop.
Other BBS features include:
• Graffiti walls. These allow users to put up a short note, advertisement, or a joke.
• E-mail (electronic mail). Lets users send private messages to other users of the
system.
• Chat (also called "page operator"). Allows you to have an on-line conversation
with the sysop, if the
sysop is at home.
Text file libraries. These contain anecdotes, jokes, "Welcome to the BBS,` handy
information, technical files and other sorts of things that people might like to read.

Once you get started BBSing, you'll get a handle on the kinds of things you tend to
find on BBSs... and the ways you can exploit them to your mis-chievous hacker
advantage!
BBS Exploitation
It used to be, long ago, that if you wanted to break into a computer system, it was
easy to exploit bugs in the system software, or default passwords, to work your way
in. Nowadays, things are a bit tougher. Those bugs and default passwords have,
for the most part, been done away with.
Oh, they're still there if you know what you're doing - but unfortunately, for the
most part you'll be stuck if you rely on those methods. What you have to do is
exploit the new line of system bugs.
Unless you have some phobia, you are not afraid of being struck by lightning every
time you leave your house. That's just not the kind of thing that makes sense to
worry about, so you probably don't worry about it at all. But what if someday you
were struck by lightning? That would change your perspective on things, wouldn't
it?
My point is this: the weakest link in any secu-rity system is the people involved in
making sure everything stays secure. Joe Blow, the average computer user,
doesn't care about security matters - why should he? He has no reason to even
think about security. He's never had files erased by a vi-rus, never had his credit
card numbers stolen, or his DIALOG account breached. Joe Blow is the weak link.
How is Joe Blow - the weak link - to be ex-ploited? Joe is a typical computer user -
and a typical human being. He's a bit into computers, but not a fanatic like maybe
you are. He's human, so he has trouble remembering fifty different passwords. So
he uses the same password for every computer system and BBS with which he has
an account. Joe uses easily guessed passwords, or maybe none at all. He's not a
computer whiz, so he doesn't always understand what's going on when people start
talking computer language to him - this makes him vulnerable to being exploited.
108
And guess who's going to be exploiting Joe Blow? Yes, you.
Getting To Know You
What I'm about to say here will sound like her-esy to some, downright evil to
others, and superfi-cially it will appear to break the very fundamentals of the
hacker's code of ethics. Well, in some ways it does, but there are a lot of things I
say in this book that are like that. It's true: life often breaks it's own rules.
Sometimes you have to break your own rules to have some fun. So any-way,
here's my warning: Watch out! Taboo subject ahead!
If you've followed my earlier advice, you have this huge list of BBS numbers, and
you've been calling them all to get more numbers. Why did I say to do this?
Because the people you will meet on these systems are people who are into BBSing.
A lot of them have accounts on other local systems or a-tabases, or at their jobs, or
schools.
If you call up Fred's BBS, and you go to the "Computers" Discussion area, and Joe
Blow is there talking about CompuServe, you have just found out a very significant
clue! All you have to do now is find out what password Joe uses on Fred's BBS.
More than likely it's the same one he uses for Com-puServe and every other

computer account he owns (not to mention, this password is probably the key he
uses to encrypt files). This is easier said than done, of course.
This is what you should do. Many BBSs have a listing of which users have signed
on to that BBS, where they live, what their interests are and what they do for a
living. These lists are like gold to a dedicated hacker. Use your program's data
capture facility to record the most useful lists you find, then edit them down and
print out the essentials.
Let's say you're looking through your captured user list from Fred's BBS, and you
see Joe Blow's en-try. Under interests, Joe put down "bowling, SCUBA diving, Star
Trek & lacrosse." Now you have some clues. It's more than likely that Joe Blow's
password is a word taken from one of these areas of interest.
When you look through these user profiles, you are learning more about these
people, you are get-ting to know them. It is vastly easier to figure out the
password of someone you know than the password of a complete stranger.
If you've been having conversations with these people on the bulletin boards,
you've found that some are computer experts and some are not. Ob-viously, it's
better to try to focus on someone who is not an expert BBSer - although some
expert users are so smug they become complacent and lazy, and so perhaps
become better targets. Use your judg-ment. A newcomer will be more likely to
choose a bad password. Newcomers (or people disinterested in computers) will
tend to choose certain obvious passwords over and over again.
To sum up: If you find out what things a user (especially a new user) is interested
in, it's "easy" to guess his or her password. If you know that person uses a
computer at work or school, it's likely the same or a similar password is used for
both sys-tems.
I'm not trying to suggest that guessing a pass-word is simple. It's not - you have
to have pa-tience, and a lot of time on your hands. But there are faster, smarter -
and consequently, more technical - ways of getting into Joe Blow's BBS ac-count
than a brute force attack. Let's look at these.
Bypassing BBS Security
Even though BBSs employ security features, there are at least eight factors which
serve to make them vulnerable to any resourceful hacker. These security loopholes
are:
• Hacker is familiar with the remote hardware.
• BBS run on home computer.
• Hacker is familiar with the BBS software.
• Hacker is familiar with the people involved.
• Diversity of people involved.
• File transfer section.
• Hacker knows when sysop is and is not watching.
• Hacker knows usage patterns.
Each of these vulnerabilities offers numerous opportunities for a hacker to break
into the BBS of his or her choice. Taken as a whole, it should be pretty much
impossible for a hacker to NOT be successful at a BBS breach.
109
Unlike other hacking situations - such as when dialing up a large government
computer for the first time - you will be familiar with practi-cally every aspect of the
BBS you select to hack. BBSs often have a menu option that gives you the

rundown on what equipment is being used to op-erate the system. The brand of
software will also be known to you, and from regular conversations with the sysops
and users, a personal familiarity will develop. Knowing all these facts gives you a
great advantage in the writing and uploading of Trojan horse programs, in the
seeking out of bugs to profit by and, yes, in the guessing of passwords.
BBSs will generally tell you upon login whether or not the sysop is available to chat.
Naturally there is no guarantee that the sysop is not present when the notice says
he's not present, but the "Sysop is IN" sign can at least warn you of when you
should definitely be most cautious.
Even if the sysop appears to be unavailable, the BBS software itself might be
watching you like a hawk, printing out your every move, or every at-tempt at
crashing the software. For example, RBBS-PC bulletin board software allows the
sysop to keep a continuous printout on each caller's name, files exchanged, and
error messages that oc-cur. As we will see later in this chapter, this can be
troublesome depending on the type of attack you wage against the BBS.
Running A BBS
The least difficult way to collect passwords is to have people give them to you. If
you start up your own BBS, that is exactly what will happen.
But being a sysop takes a lot of work, and it also involves the use of your computer,
modem, tele-phone line(s) and possibly even your printer. That leaves little
equipment to hack with!
The original three motivations for hacking local BBSs were for: 1) the excitement
and curios-ity-satiating value of it, 2) the opportunity for low-risk practice and, 3)
to obtain passwords which might also be used by the same users on other computer
systems. When you set up your own,BBS, the first two of these reasons are sud-
denly gone. Only the third - password collection - remains, and there are more
efficient ways of collecting passwords than this. However....
There are some advantages for the hacker who runs a BBS, whether or not the
hacker is willing to abuse the trust users place in the sysop. For exam-ple, the
hacker can set up a BBS specifically as a place for other hackers to pose questions
and ex-change information. If you decide to do this, you will want to make sure
you are overly wary in your advertising and in your group's initiation proce-dures,
to ensure that you're not accepting law en-forcement officials or hostile hackers
onto your board. So as not to get too off the topic, I will come back to the security
subject later, at the end of this chapter.
Running a BBS - or at the very least, setting one up on your system, even if you
don't go public with it - will teach you more about how BBSs op-erate than anything
else. It's always beneficial to a hacker, and soothing to the true hacker's mindset,
to be fully conscious of how a computer system works. Also, you can try setting up
a limited BBS and practice breaking into it from a friend's house, or challenge
others to do so (you're best off making this challenge only to close friends). This
will show you what can and cannot be done on the particular BBS software you're
running, and might teach you something about hacking as well. Then you can go
out and infiltrate other systems which run the same software. And you can alert
other sysops to the se-curity risks inherent in their systems. I've never run a BBS
by myself - I've never wanted to devote a computer and phone Me, nor my time,
toward the maintaining of a bulletin board system. But I have been an assistant
sysop with full operating abilities on several BBSs, and in so doing I've seen a lot of
tricks that people have tried in an effort to break into those systems.

Midnight Masquerade
One night, at around 1:30 a.m., the Treacherous Den BBS received a visit from a
hacker. The hacker tried logging in a few times using my handle, The Knightmare.
The sysop of the system, my friend DR dendryte, was sitting there watching the
hacker go at it unsuccessfully until finally he pressed the function key which
brought the two of them to chat mode. The following is a transcript of the ensuing
conversation, copied exactly as it appeared in the sysop's printout, but with
unnecessary carriage re-
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turns removed. [My own comments are in brackets, like this.]
SysOp wants to Chat!
This is DR dendryte, Who RU?
this is Knightmair i Forgot my password. Log me on.
[At this point, DR dendryte knew for certain he was dealing with an impostor. He
knew that I never called that late at night, and that I would never for-get my
password, considering that it was the same password I'd been using for several
years. DR den-dryte, however, decided to play along.]
How Did you forget your password??!
I dont know it just slipped my mind. i guess! I can't just give out passwords like
that you don't have to you can just log me in.
If you're really The Knightmare then tell me, what is your REAL NAME?
[A pause, and them]
don't you trust your own best friend & co-sysop?
come on
i cant beleive you!!!!!
You are definitely NOT The Knightmare...
[Here DR dendryte was referring to the hacker's bad spelling and grammar; DR
dendryte knew that I am meticulous in my on-line chat writing.]
he never makes stupid spelling mistakes like that, or uses bad grammar or
[Here, both are trying to type at once. DR dendryte lets the cracker speak:]
That does igt! I don't want to be your friend anymore! just delete me off the BBS.

If you are really who you say you are, let's go voice!
[That is, DR dendryte is asking the hacker to turn off his modem and pick up the
telephone - go voice.]
i Don't believv you don't trust me
GO VOICE
Theres no phone in the room..
Sure there is! On the bookshelf next to you!
It broke
HA!! You should have said, "WHAT book-shelf?" There IS no bookshelf in the room!
HA HA HA HA HA A
+++
[Click.]
The next day, when DR dendryte told me this story I said, "You should have told
him, 'I AM The Knightmare!' That would've really embarrassed him!"
Impersonations of this kind might work, but only if you are already intimately
familiar with the person you are attempting to impersonate. In this instance, the
hacker chose to login as me, correctly assuming that I would not be at the sysop's
home at midnight. Perhaps the hacker also supposed that DR dendryte would be
asleep.
It seem's to me that a ruse like this is more likely to work on a large corporate
computer, where no-body knows each other and workers may not have the great
love for their computer system that sysops have for theirs.
Hackmail
The Treacherous Den BBS was a particularly sweet target for hackers to try and
infiltrate. It was
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a large system, with many users (many of whom were sysops of other BBSs), and it
had dozens of games and digitized pornographic pictures that could be downloaded.
The system was run off a pirated copy of a popular BBS software package, but DR
dendryte had altered it so that it appeared to have been officially registered in his
name. Once a long-time user of the system asked DR dendryte an innocuous but
technical question about the BBS, over the phone. DR dendryte told him to hold on
a minute, he would look up the answer in the manual.
"Oh, you bought it?" the user asked, apparently referring to the BBS software.
"Yeah," DR dendryte replied, referring to the in-struction manual, which he had
found ait a used book store for a quarter.

DR dendryte answered the user's question, chatted awhile longer and then hung up.
He didn't think any more of the conversation until the follow-ing month, when a
cardboard envelope arrived in the mail. It was a disk envelope, with a corn-puter-
printed return address label affixed that gave the address of the company that
produced the BBS software. DR dendryte opened the envelope. Inside was a letter
addressed to DR dendryte's real name, and signed by the author of the BBS
software, the man who also owned and had started the com-pany. The letter read:
Dear Mr. L__ H__:
K__ Software has adopted a new software upgrade policy. All customers who have
pur-chased non-entertainment packages from be-fore July 1986 are entitled to a
yearly free up-grade.
This new version of your software is fay compatible with all previous ones. To
upgrade, simply insert the enclosed diskette and type START.
Thank you for purchasing fine quality K__ Software. We hope to have you again as
our customer in the future.
Very Truly Yours
(Signature)
P__ I. B__
Not only did DR dendryte know immediately that this was a total crock, but he knew
who had had the gall to send it to him. At once he reduced login access for that
user he had spoken with on the phone, down to one-time visitor status. Then he
wrote a nasty note and e-mailed it to him. That particular user was the only
person, aside from myself, who knew about the manual. But of course, I already
knew that DR dendryte had not bought the software, but had obtained the manual
through alternate means. The user had assumed incorrectly that because DR
dendryte had the book, he must have bought the BBS.
Upon examination of the disk that had been mailed to him, we found that the disk
contained eight files:
There was a text file which explained all the "wonderful and exciting features you
will enjoy having on your new version of L BBS Software." There was an instruction
file called START, which read the contents of that text file. START would then
"update" the old version of the software with its "new" version.
There were four files on the disk that exactly matched ones found in the actual BBS
software (apparently these were there to misdirect our at-tention), and a fifth
progFam that matched closely but not exactly! (It is possible to compare two files
by using the "comp" command under MS-DOS, or by using a relevant feature of a
Norton or Norton-type program.) Finally, there was a blank file called T on the disk,
which served no purpose at all.
It took us hours to figure out what the user had programmed his "new" version to
do. As it turned out there were two things different. A copy of the user information
file was programmed to be e-mailed to a user the first time he logged on; a trap
door had also been inserted that would give tem-porary operating system access to
anyone who typed control-E, control-X, control-1, control-T, con-trol-! at the
username prompt.

You won't be able to pull a stunt like this unless you can gain access to the source
code for the soft-ware, as he must have been able to do (unless you want to
recreate from scratch an entire bulletin board system).
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Once again, another of those pesky hacker attacks was thwarted!
Crashing BBSs
On another BBS that I was a part of, the sysop would come home from school every
day to find his system had crashed. It had simply frozen up and would have to be
rebooted. Eventually he found out from someone that there was a bug in that
version of that particular BBS. A "x" typed at the password prompt caused
everything to halt. Key por0ons of the BBS software were written in easily
changeable, interpreted BASIC. To remedy the problem I simply added a line after
the prompt that would disconnect anyone who tried typing in the dreaded 'Ax."
It worked.
I've always wondered about that "x." Why would such a harmful thing be there? I
can't imag-ine the programmer putting it in purposely, unless perhaps it was a
means to bother unlawful users of his software. Maybe it was some trap door that
had gone awry. Maybe if I had studied the program more I would have figured out
its meaning.
Maybe - this is a credible possibility - that bug had been placed there by the person
who had given the copy of the software to the sysop, or by the pirate who had first
bootlegged it, or by anyone at all along the line. Pirated software travels so rapidly
across the country and around the world that literally thousands upon thousands of
persons might have had the chance to add the 'Ax" thing and distribute the buggy
code. Hey - are you starting to get an idea there? I know I am!
You could either write your own BBS program or alter a currently existing one, with
some secret features such as an exit to DOS, or whatever trap doors tickle your
fancy. You could put in a line which checks to see if a very obscure and unlikely
control code is entered at the login prompt, and if so, highest system access is
gained.
A twist to this tactic is to write or change a terminal program, which you give to the
user. When it receives an internal code while connected to your BBS, you gain
access to the calling com-puter. For example, a user would be running your special
terminal program while calling your BBS. The BBS, would send a code to the
caller's modem, which would allow you to wander around the caller's hard drive. To
cover up the fact that you're roaming around in there, entry would have to take
place during a long file transfer or, if it is a slow modem, during those time lags
between modem action. The terminal program could continue pre-tending to
receive data while you surfed the remote user's drives.
PRODIGY, a graphic-oriented interactive, on-line service, was accused of engaging
in a variation on this theme in the summer of 1991. Users were finding personal
data buried inside the software that is used to dial up PRODIGY. After complaints
and outrage, PRODIGY's senior vice president mailed out a utility to those
concerned, which would erase non-essential data from the service's terminal
software. In an accompanying letter he sincerely asserted:
As we have stated publicly and written on-line, the PRODIGY software does not
read, collect or transmit to PRODIGY Services Company any information or data
that is not directly connected to ur use of the service. We want to assure you yo

that we will continue to work to safeguard the privacy of all of our members.
Maybe theirs doesn't do those things - but yourscan!
Years ago, one group of enterprising hackers distributed their own homebrewed,
broken termi-nal program for the Macintosh line. The program gave users the
convenient option of allowing them to store passwords and other login procedures
on disk so that one would never have to worry about forgetting them. The
information was stored in en-crypted form on a hidden part of the disk. The pro-
gram was developed to "go bad" after several phone numbers and passwords were
stored, the hope being that users would send back the disks, and the hackers would
end up with a bunch of precious login information.
This should be taken as more theory than actual practice: PRODIGY can get away
with requiring users to boot from their software because of the unique graphics and
mouse interface provided. Unless you work something like that into your term
program, who's going to want to bother in-stalling and learning your software when
they are already familiar with one or several commercial
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packages? In fact, this is what happened to that group of hackers. Initially there
was great interest in their terminal program (which they gave away free), but no
one wanted to go through the trouble of using it. The problem was, the hackers
gave the program out to experienced users who had already developed an intimacy
with one or more commer-cial programs. No one needed the hacker's terminal
package, and so what seemed to be a great idea net-ted the hackers nought.
As for the first idea - changing a BBS to in-clude trap doors - now that is a viable
possibility. There will always be plenty of people looking to set up their own
bulletin board system, or who are looking for ways of acquiring new software.
Distri-bution is less of a problem than the programirang, especially considering that
you will not only have to interject code for the trap door but, for best re-sults,
determine a way to hide that code from inter-ested eyes.
Trojan Horses
It is usually easy for a hacker to infiltrate a BBS with some version of a Trojan
horse program. The hacker writes a program which performs some interesting
function, such as playing a game or putting pretty pictures on the screen. Hidden
in that program are instructions to read BBS password files, or carry out some other
covert operation. The hacker then uploads the program to a BBS and -here's the
important part - hopes the sysop runs the program.
You will want to procure a copy of the BBS program before writing a Trojan horse,
so that you know exactly what those secret instructions should be doing.
Otherwise, how will you know what files to look in or where to go on the disk for
information?
What kinds of things can you program a Trojan horse to do? Here are some
suggestions:
Have it secretly reprogram the BBS itself to in-clude a trap door. If the BBS
program is written in an interpreted language, you can have the Trojan horse add
some lines which would give you sysop ccess upon entering some code word. This
actu-ally has been done on a popular Commodore 64 bulletin board system that
was written in BASIC.
You can program the Trojan horse to look into the password file and send data
contained in it back to you somehow. Many BBSs have a text file section. You can

have your program encrypt the passwords as it routs them out, then append them
to the end of one of the text files. Then you simply log on, view the files, obtain
the encrypted pass-words and decode them. People reading the text files on-line
will interpret the seeming random characters as line noise or harmless file
corruption.
Another way to get password information back to yourself is to use the BBS's e-mail
function. To avoid suspicion (because sysops love to read the e-mail users send to
each other) you should, again, encode the information and imbed it within an oth-
erwise bormg piece of e-mail.
A Trojan horse may contain a rough version of some key portion of the BBS
program itself. The Trojan then extracts that piece of itself, copying over the
legitimate version already on disk.
Covering Up
Trojan Horse Activity
There are two things you have to worry about when you upload a program
containing a Trojan horse to a system:
1 That your Trojan horse will be discovered while it is running.
2 That it will be discovered either before or after it has run.
I will talk about each of these problems in turn.
While It Is Running
The rational hacker has an easier time of this than does the malicious system
crasher. You see, if junior Joe writes a program to covertly format hard drives,
something has to be happening on-screen to divert the user's attention while the
hard disk drive light flashes on and on and on.... It takes quite a while to format a
hard drive. junior Joe has to clev-erly devise some non-interactive time-killer that
will hold interest for the length of the format or file de-letions. The time-killer could
be a pornographic display (perhaps accompanied by digitized sound effects: "Ohhh!
Ooooh baby! Yummm-mee ... !") or a digitized musical score, or perhaps the
program could send graphics to the printer. Meanwhile, you
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will be using rapid-action Trojan horses (sprinters) which do their thing in short,
quick bursts.
Never have your program access the hard drive (or any unauthorized peripheral) for
what the sy-sop will think is no reason. When the Trojan horse is actually going
about its business, there should be a note on the screen to misinform the sysop as
to what the program is doing. For example, if the Trojan horse is hidden in a game,
you could have it display the message, "Saving your new high score...", while the
program changes around user access files (or whatever your horse is trained to do).
Don't forget, the program actually should be saving the user's high score as well,
and the entire drive access time should be very short. As soon as the Trojan horse
is finished operating, the program should erase the note from the screen; this will
en-sure the drive access time goes unsuspected. If possible, have the note be
erased midway through the Trojan horse's activities, to deliver the illusion of very
quick drive access.

Another way to access the drive unnoticed is to have the program say something
like this when it is started up:
AutoCheck Virus Detection Program v1.3 (c)opyright 1992 Paul Bradley Ascs.
Scanning file FILENAME.1 for viruses
Scanning file FILENAME.2 for viruses
Meanwhile, the Trojan horse will be scanning the computer's hard disk for
passwords!
For FILENAME.1, FILENAME.2, etc. in the above, substitute names of the program
and data files that were uploaded with the application. A nice extra touch is to not
have the ellipses ( ) writ-ten to the screen immediately. Instead, have the periods
appear one at a time between disk accesses, to make it appear that the program is
really scan-ning through the different files.
Trojan horse activities can also be covered up under befitting circumstances by such
messages as:
Opening data file
Reading data
Saving selections before quitting
Loading text
Messages should always follow naturally from whatever's taking place on the visible
program.
Trojan horses that perform BBS functions (such as changing passwords) should do
so via direct disk access if possible, and not by utilizing the BBS program. That lets
you bypass any security logs and printouts that are made of suspicious activity.
Before & After
Sysops, system administrators, and even regu-lar u-,ers are now wise to the
hazards of bulletin board file transfers. They understand at the very least the
threat of viruses, and so are more likely nowadays than ever to examine a program
care-fully before using it.
This means they will use a virus scanner to check your uploads for viruses. This is
almost a given, but it is nothing to be feared since the avail-able virus detection
programs will not locate your Trojan horse in an otherwise valid file. What you do
have to be careful of, is that the sysop or system manager will manually examine
your uploads for filthy words or erratic programming.
As before, malicious crashers and system van-dals have a bigger job ahead of them
than you. They have text they have to hide within their programs. For instance,
who hasn't heard of a virus or logic bomb that screams "GOTCHA!!" as it overwrites
the File Allocation Table? Programs are available that specifically look for this sort
of thing in files. Even if the sysop doesn't have one of those pro-grams, if he or she
is cautious enough, that crasher's "GOTCHM!" will certainly be discovered before the
program is ever run.

Your Trojan horses won't have as much to hide. AU the text in your programs will
be text that gets written sensibly to the screen anyway, text that is either part of
the application program, or text that looks like it comes from the program, but is
actu-ally used to blanket your Trojan horse. Also, your program won't have any
"format &' commands sticking out like sore thumbs. Thus, your job is easier than
the crasher's, though it's far from being a snap.
There may be commands in your program to read or write, or to rename private
BBS files. These
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commands, and more importantly, the filenames, must not be discovered by the
sysop. It is not good enough to use a simple one-letter-higher cipher to encode
commands and filenames; for there are programs which can scan a file and display
read-able text it contains. If you just push everything up one letter higher (i.e.,
"PASS" becomes "QBTT"), those programs will still locate this encoded text -and the
sysop might be smart enough to discover what it means. You're better off encoding
text using numbers, symbols or foreign alphabets.
A program you upload may be an uncompiled source listing or a batch file. In this
case, you will have to do some fancy fingerwork to keep your Trojan horses hidden.
NEVER simply upload a batch file in its raw form. Imagine if you were the sysop
who got this from a user:
cd BBSUSERS
open USERINFO.TXT
read USERINFO.TXT: User #44
set systemlevel 3 == systemlevel 99
close
exit
This isn't real code. It's meant to illustrate the kind of brazen attempt at upgrading
access that would catch a sysop's attention.
One way to eliminate this problem is to have the main application program create
batch files and other programs it needs. The batch commands start out as encoded
gibberish in the application pro-gram. A subroutine is called, which opens a text
file, decodes the commands, fills the file with them, then goes about its business.
The creation and use of the file should probably be done on separate oc-casions, to
keep illegal drive access time low.
Also for easily-readable sources, the Trojan horse part should not be standing right
in front or at the end of the listing. Put it deep within the pro-gram. Add
comments that will tend to mislead the careless reader. Remember, if your cover
program is particularly clever, the sysop may want to ana-lyze it, to see how you
achieved such a wonderful thing! This means your cover program could be under
some heavy scrutiny; and your Trojan horse could be discovered by accident.
Consider having your program delete the Tro-jan horse after it has been executed.
That is, have the last few steps the Trojan horse takes be to erase itself from the
program.
Alternatively, have the sysop delete the applica-tion prograrn (and thus the Trojan
horse). This can be tricky: how can you get the sysop to delete all those files you
uploaded, without letting on that something shady is going on below the surface?
Ways this can come to pass are by having the ap-plication program be something

that you know the sysop already owns, or something similar yet infe-rior to the
sysop's version.
Or you could just write the sysop some e-mail, saying that you found a potentially
dangerous bug in the program, "so if you would delete it I will send you a corrected
version." This can only be done when the application you sent is a compiled
program, elsewise the sysop would be able to correct the problem himself -wouldn't
he!
A particularly paranoid sysop might transfer any uploaded files to a different
computer before he tries them out. Or the directories could be set up different than
expected, or the BBS might be set up to upload files to a floppy instead of the hard
drive. Take these things into consideration when you program, and have your
Trojan horse only work when the computer is set up as it is supposed to be. That
is, it will only run when it has access to the password files, or whatever else is
necessary for the Trojan horse to function. It's also necessary to do this because, if
the application that hides your Tro-jan horse is good enough, the sysop will make it
available for other users to download.
A Few Tips For
The Do-It-Yourselfer
We talked earlier about hacker BBSs. What if you make a dedicated effort at
finding a suitable BBS on which you can learn and share, but none turns up in your
search? You may want to start a BBS of your own to suit your needs. Get ahold of
the proper software, gather your most trustworthy friends together, and put
together your own bulle-tin board system!
Running your own system means that you won't get much use out of your home
computer and the telephone line to which it is connected. This would be no
problem if all you did on your computer was hack, since your hacking can be
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taken on the road through the use of laptops, pub-licly available computers and the
like. But you most likely use your computer for other sports: game playing, word
processing, programming, and legal modem usage. Consider this before you get all
ex-cited about setting up a BBS.
One way to get around this problem - and to simultaneously overcome many of the
problems that arise when one sets up a BBS - is to use your hacking skills to break
into a mainframe far away from your house, and use it for the site of your elec-
tronic bulletin board.
Whatever home you give to your system, you should install it with a false front to
make it look legit, and a back side that encompasses the private area for accepted
hackers only. Invite the hackers whom you know to be wise and trustworthy into
the inner sanctum, while leaving the rest of the board open for unknowns to
explore.
I have seen some fantastic BBSs go up, only to fail miserably. And I've seen so-so
BBSs that quickly establish themselves as the "in" place to be. As a hacker BBS,
you won't experience this to such a great extent since you aren't going to advertise
as much as a generalized BBS would - after all, you re trying to keep out all the riff-
raff. But you will still want new users to come and enjoy them-selves, and if they
turn out to be the kind of folks you'd like to invite behind the scenes to your secret
hacker sub-section, all will benefit by it.

The strategy for getting users to come in and stay awhile is to set up your BBS,
turn it on, then leave it on. Many first-time sysops, excited with the prospect of
running their own system, continually take their BBS off-line to make
improvements. Don't do that! If someone calls and finds no com-puter is there to
pick up, they aren't going to call back a second time.
Advertise your BBS on other BBSs whose mem-bers you would like to have on
yours.
Have members of your BBS run scouting mis-sions to the above-ground hacker
BBSs. You will find out what, if any, useful information is ex-changing hands over
there, and you may be lucky enough to discover a hacker who is worthy of be-
coming a member of your club.
Before you allow an unknown hacker into the secluded realm of your hacker sub-
boards, you should make doubly and triply sure that he or she is not a cop. Real
hacker BBSs verify their members by having them go through an initiation
procedure which includes recommendations from respected hackers, full disclosure
by the hacker of personal information so that it can be checked, and an auto-
biography detailing what he or she has done, and what he or she can contribute to
the group. Don't be fooled! Verify that this self-proclaimed hacker is not an FBI
agent by checking out credit ratings, telephone company data, and positions on
other computer systems. You will have to use every inch of your hacking skills to
ensure that the personal information that you are given matches a real hu-man
being. This isn't paranoia - it is common sense. Many, many hackers have been
fooled by impostors pretending to be hackers. The safest thing is to not accept new
members into your BBS; but that may not be the smartest thing because it
eliminates a possible world full of information that will never expose itself to you.
Exploring electronic bulletin boards can be a pleasant pastime. It can sharpen your
skills and teach you much about a lot of things. There is such a startlingly large
number of BBSs around that a hacker could find himself spending all hours of the
day and night connected to them, never to enjoy the thrill of the hack itself.
Considering the dangers of hacking, that might not be such a bad fate.
In an upcoming section we will explore more ways you the hacker can protect
yourself from the law. But for now let's get back to hacking - some of the best and
most useful techniques are yet to come!
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Chapter Eleven:
Borderline Hacking
I want to talk about some non-hackerish ways of dealing with hacking problems.
There are times when some need forces a hack to be accomplished under time
constraints. When that is so, the usual time consuming methods may fail us, and
so one must resort to desperate measures. For the most part this is a topic related
to doing hacking as a job, which I feel is important to bring up because lately being
a hacker-for-hire has become an issue in the hacking world.

Hacking For Ca$h
There are hackers who have "made good," be-coming security consultants for
corporations and governments. These turncoats have received criti-cism from two
directions. From the hackers: "How dare you do this to us!" (Rebuttal: "Obviously
you are not a real hacker. A True Hacker would delight in trying to outwit another
hacker's attempts to beef up security.") From the law-abiding citizens: "We couldn't
trust him before, why should we trust him now?" and "Just because you know how
to break into systems doesn't mean you know how to prevent them from being
broken into." These are all valid points.
If you wish to enter this line of businessf you are not alone. Companies have paid
as much as $20,000 - possibly more - to have a hacker at-tempt to gain access to
their computers. "Tiger teams" is the term for groups of hackers or some-times
lone hackers who are hired by an organiza-tion to put their security to the test. If
you decide to pursue such a path, you will want to project an air of professionalism
and sincerity. You have to prove to them you are a competent hacker, but you
can't let them know that there is a rebellious spirit inyour heart.
Remember that computers are vulnerable not only to crackers. There are also
viruses, improper computing environments, loose-lipped employees and other
hazards that can make even a tightly sealed ship sink. Preparing the owners for
any catastrophe will earn you extra respect and recommendations for other jobs.
To touch on the second criticism of the "law-abiders," it is important to offer
solutions to any se-curity loopholes you uncover in your investigation. You are a
hacker, so you know how hackers think.
119
You know their minds and their methods, and so, yes, you have the expertise to
recommend action that will prevent invasion of their system. Explain to your
employer why it is important that each of your suggestions be followed. Tell them
what you did to get in, the weaknesses you saw, and the po-tential trouble spots for
the future.
Other suitable clients are private individuals who are concerned with the
information being stored on them in databases. Hackers have been hired to alter
phone numbers, find unlisted num-bers and addresses, remove fines, look up
license plate data and change school grades, among other jobs. Hacking a
business's computers under con-tract for that business is a perfectly legal occupa-
tion, but when you start helping people access and perhaps change their data files,
you have stepped into the unlawful zone. Therefore, you should be very careful
about who you deal with and how much you let those people find out about
yourself.
Hacking is a hobby. Once you start getting paid for it you run into a problem: What
happens if you can't complete a job?
True, nothing should be too tough for the Super Hacker like you, but occasionally
you might have a deadline or unexpected difficulties and the system that looked so
fragile when you began now looms as a large and impenetrable monster that is
beyond your capabilities. That's where foul play comes in. Hopefully you won't
have to resort to anything less than hacker's methods. On the other hand, if you
have reached a point where you must choose be-tween balking the job or finishing
it in an untradi-tional way, you might decide to do the latter to keep your good
reputation intact.

Besides, there's no sense in restricting yourself to hacker techniques when the bulk
of penetrators are going to use these uncouth methods anyway. If a company is
paying you to stop intruders, you'll want to make certain that there really is no way
that these blunt methods, commonly used by non-hackers to gain access, will be
viable. Therefore, you might have to try them out on the system you are being
paid to protect.
Filthy Tricks
These tricks are filthy because they are the kinds of things a rank amateur would
do. These
"techniques" are strictly for non-hackers. I'd go so far as to say these are the kinds
of things a non-computer-user would do! When I say 10computer user," I mean
someone who uses a com-puter because they want to, as opposed to someone who
does so from necessity.
Often these tricks are used as a precursor to some sort of theft, or espionage -
topics which lay on the fringe of true hacking only because they in-volve
computers. A true hacker must know these tricks exist, but would use them only
as a last resort - and then only with severe motivation to break in.
Bribery
You might not want to bribe the system admin-istrator, but there will probably be
some underlings who also have "God access," who may be willing to lend same to
you, for a price. I would suggest you use bribes to pay for access to the system,
rather than bribing the person to carry out computer work for you. After all, you
want him to remain unin-volved in your affairs; if you're spying by com-puter, the
last thing you need is a company insider knowing that you're doing so.
Have the bribe pay for either access to that per-son's account, or to a newly created
superuser ac-count. If the latter, only log on when the bribee is not on duty, so
that he or she won't get curious and look to see what you're up to.
Offering money in exchange for a specific serv-ice to be performed (like offering
$500 to change a grade from an F to an A) is even tackier, and more dangerous,
than just paying for system access. For Instance, in 1973 a computer operator
employed by the Illinois Driver Registration Bureau was given a $10,000 bribe to
steal a tape reel which contained personal information about drivers registered in
that state. Considering that Departments of Motor Vehicles are some of the easiest
and safest of,corn-puter systems to hack into using social engineering, it was both
foolhardy and expensive to pay that much. My source of information on this case
does not mention whether or not the people who offered the bribe were
apprehended, but just the fact that we know about the bribe implies they were not
successful. (Or at the very least, that future at-tempts would be less likely to
succeed.) This is why
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you should hack if you can hack, and use other methods ("filthy tricks") only as a
last resort - and then only to get into the computer, not as payment for the
information you seek.
Besides, with system access 'you can try-before-you-buy, and you will be sure to
get your money's worth, especially since once you have logged on, you can create
your own superuser ac-count that the person you bribed doesn't know about.

Booze And Broads
Yes! It sounds like science fiction but it's true! There have been reported cases of
crackersgaining access to computers by supplying alcohol,drugs and even
prostitutes to the security person-nel at a company. An article
by Douglas Waller inthe May 4, 1992, issue of Newsweek reported that a Japanese
competitor to a "Midwestern heavy manufacturer" had outbid them one too many
times. Upon investigating, it was found "that theJapanese firm had recruited one of
the manufacturer's midlevel managers with a drug habit to passalong confidential
bidding information." This sortof dealing sounds risky to me, because who
knowswhat someone's liable to do once you've gottenthem drunk or high? But
that's why I'm sayingthese are the "techniques" used by the computer illiterate.
Bad Feelings
This isn't exactly a dirty trick, but it feels like one. If you can manage to find
yourself a worker who feels maligned by the company, possibly one who is about to
leave, especially one with pro-gramming ability - then you've got it made. Play up
his or her bad feelings toward the company. Remind them how the company
screwed them, didn't recognize their good work, and continuously passed them
over. Without being specific, say you want to help them get revenge on the
company. Of course, a hacker does no such thing, but if you can incite the
disgruntled employee into action, he will get the blame for your own hackerish
misconduct. (I know, I'm cruel sometimes.) In any case, employees who are
moving on to greener pastures, or those who are disgusted with their bosses, are a
great source of inside informa-tion, including company lingo, phone directories
procedures and policies and, of course, passwords. If your goal is to penetrate a
system run under top notch security, getting a friend on the inside may be your
only hope. But an ex-employee doesn't have to leave angry to be of use. Anytime
you hear of an employee either quitting or being fired there is the opportunity to
find out that blessed data. Af-ter all, computer accounts live on long after an
employee has left a company. Once someone has left the company, what does he
care whether you use his password or not?
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BLANK PAGE
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Chapter Twelve:
What To Do When Inside
It seems straightforward enough. You're inside? Great! Take a look around! Of
course that is what you'll do in most cases, after getting into a system and patting
yourself on the back. But then what? To answer this we will have to begin with a
re-thinking of our goals and morals.
Hacker Motivations Revisited

The true hacker is motivated by her or his de-sire to learn, to understand, to
cleverly and harm-lessly outwit.
Others who use hacker techniques might do so because they have a desire to learn
about their competitor's secrets; to understand why they keep getting underbid
every time; or to cleverly outwit the company or individual who they feel owes
them something, and enact revenge upon them.
So let's see what we have here. There is the free-thinking, computer-enthusiast
hacker, the eco-nomic espionage hacker, the politico-espionage hacker, the out for
revenge cracker, and finally, the hacker for hire. Most often these assorted infiltra-
tors will have breached security with a low-level account. This is because accounts
with low security clearance are the most prevalent, and many hacker tricks focus on
the naive user who is more prone to having a low-level account.
The hacker for hire and the hacker spies will have target computers, perhaps even
specifically-targeted people in mind. They will want to go after either a particular
username/password combina-tion, or any access big enough to allow covert entry
into their target's account.
Vandals and revenge hackers obviously would love to attain higher access than
what they came in on, but unless they are sufficiently skilled, they will probably opt
for the quick hit-and-run. That is, they will be content to break in under any
password, do whatever damage is possible, send some nasty e-mail, and leave.
Probably they will continue com-ing back over and over again until they are either
arrested or shut out for good. If these "hackers" do have targets in mind (like the
president of the com-pany or whomever) they will most likely settle happily into
whatever lower-level role they find themselves in. If they have any skills or
computer know-how though, watch out.
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The true hacker may or may not want to take the hack all the way to the top. He
or she may feel it is not worth the effort for the amount of work that seems
necessary to increase a low system access to a higher one. This isn't giving up, it's
being practi-cal. If the knowledge to be gained seems minimal or available
elsewhere, there's no point in wasting time trying to get it. Or, the hacker may not
feel se-cure enough in his knowledge of the computer, its users, or operating
system to feel confident in his ability to achieve higher access. This is a valid
feeling, and an intelligent one; if the hacker realizes he is somehow ignorant, then
he can stop and do what is necessary to learn what he does not already know. If
something like this comes up it's probably only a matter of research to put the
hacker back on the track toward superuser status. As the hacker BrainMan put it: I
know the computer will be there for a long time to come. I like hacking, but I also
like exploration. Sometimes I feel I'd rather wait for another day to do the
exploration, the bookwork or social engineering, that will get me into an account,
and I'd rather do some real exploration of a computer right now.
Besides increasing one's status in the system, a hacker has many options to choose
from once in-side. A hacker may:
• Read the documents that are available, and run the programs.
• Download files.
• Notify the system administrator of the presence of a security problem.
• Learn about the computing environment.
• See if other computers may be contacted from this one.
• Cover his ass.

Or a hacker might simply log off and never return.
If you have managed to work your way into some data that you feel might have
market value, you might consider selling that data and thereby fund your next big
computer purchase. I recom-mend strongly against doing so. Becoming a spy -for
anyone - becomes a serious and dangerous business. It also helps to further
degrade the image of the hacker in the public's eye, and will serve only to make
matters worse for hackers in the long run - and you in the short run - if you are
caught.
Although most courts and CEOs would dis-agree, I personally believe that there is
no harm done in reading through whatever files are on a system, so long as no one
is hurt in the process. At least, I don't think reading private files is a crime any
worse than hacking one's way in, in the first place. You will have to construct your
own set of ethics to guide you; I sincerely hope those ethical constraints are based
firmly on the principles of the hacker ethic that both opens and closes this book.
Logging off and never returning is something the more fanatic and paranoid hackers
tend to do. It is akin to B & E without the E, and I can not see how they can
morally condone the "B" (breaking in) while shunning the "E" (entering). I suppose
the hackers who disconnect without system interaction do it either because all that
matters to them is get-ting in, or because they are intensely seared of dis-covery.
The other options I mentioned - increasing status, helping the sysops, and the
learning - all require different degrees of familiarity with the computer system you
have entered. Let us think about where you might find yourself, and what should
you do when there.
To begin with, the account you have hacked yourself in with can be a single user
account, a group account, root account, or "special account."
If it's a root account, congratulations! You now have the ability to do whatever you
want. The root account is held by the system administrator (or one of several
"sysadmins"). It may also be called by different names: avatar account, god
account, sysadmin, superuser, demigod account, sysop ac-count, or admin. Or you
may never even know you've gotten into the root until you find you can do stuff
only the Computer Gods high upon Mount Input/Output should be able to do.
A "group account" is one used by many people. It might be a departmental or store
account, where everyone in a particular store or department can log in under the
same name/pass combo. Depend-ing on the situation' those who are of a certain
rank or job may have their own shared account. For ex-ample, many companies
like to set up limited ac-counts for secretaries, typing pool or temps. Other group
accounts appear in places where terminals are available to a number of employees,
but where
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employees have differing levels of security clear-ance. Thus, all may be able to
search a database, but only those who log in with a certain password can enter new
data, or can change the way the da-tabase is structured.
"Special accounts" include guest or demo ac-counts that allow one to take a sneak
peek before subscribing to a service. They may be testing ac-counts put in by
system programmers. Special ac-counts may also take one directly to a program,
rather than logging you to an operating system prompt. Programs are set up this
way for tutorial purposes, to dispense information, or so access to a particular
application may be more freely available. If the account you've managed to hack is
a special account, you might have to break out of it illegally and enter the operating
system if you expect to in-crease your access level.

In any case, before any action can be taken you must understand what kind of
access you have, what privileges you're entitled to, and how they can be exploited
to your advantage. This may mean you'll need an intimate knowledge of the
machine and its software. Before we can proceed there's one teeny weeny concept
you must have full compre-hension of. I've just mentioned it twice now - the
operating system.
Operating Systems
Okay, clear your mind of any thoughts you've ever had about computers. We're
going to start at the very beginning.
Let's say you had a computer that only did one thing. For instance, think of a coin
operated arcade game. That's a computer which plays but a single game. With a
one-game computer, as soon as you push the on switch, the game can start
running. Af-ter all, there's nothing else to do with the machine except play that
game.
Now let's add a second thing to our computer. Let's say, not only does the
computer play a game, it also does word processing. So we now have a two-task
computer.
What happens when we push the on switch? Does it go right to the game? It can't
- what if we wanted to do word processing? You see, now we have to make a
choice. When we turn on the com-puter, we now have to specify somehow whether
we want the game or word processing. How do we let the computer know where to
go?
Well, we could have two separate switches, meaning any time I press the left
switch, the game goes on and when I press the right switch, the word processor
goes on. That may be a good solution for a little while, but what if I want to add a
third thing to my computer? Or a fourth? Do I keep adding more switches?
What I do is, instead of adding hardware switches, I add a third program, a
software switch. The third program is called the operating system (or OS), and
when I push the computer's switch, the computer will automatically turn on the
operating system program.
The operating system is a program that lets me choose between the game or the
word processor. For example, when the operating system is started it may put a
prompt on the screen such as, "Which program?" to which I would reply, "Game" or
"Word Processor."
As you are well aware, this is basically what happens in real-world operating
systems. In the early days of computing, when computers didn't do much more
than run a few select programs, the controlling software was called "the monitor."
As computers became more complex, there came the need to control multiple
users, many peripherals, security, and an interlacing of program function-ings. The
monitor grew to become an all-encompassing program which did a lot more than
just allowing the user to choose between a few programs. And so the term
"operating system" is now used to describe this complicated piece of software.
Operating systems control the functioning of the entire computer; they control how
resources will be allocated to the tasks at hand, how memory is used, which
programs are to be run and in what order. It is the absolute master-control
program; when you understand it, you have the understand-mg necessary to
master the computer.
Some operating systems you are most likely to run into are "UNIX," "MS-DOS" or
"P&DOS" (on IBM compatibles), "PRIMOS," "RSTS" (on Digital Equipment
Corporation's PDP-11 minicomputers), and "VMS."

It is important to understand operating systems because:
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1. If you don't know the commands and syntax that control the computer, you
won't be able to get the
computer to do anything.
2. When you understand how an operating sys-tem works, you will be better able to
look for bugs in it.
Bugs
invariably lead to security loopholes, which lead to a happier you.
3. You want to be familiar with the limitations of the operating system's security, so
that you can exploit
those limitations.
4. When you know how an operating system works, you will know what the
computer's managers can do to
trip you up, keep track of your whereabouts, and keep you from coming back.
All of this leads up to one big THEREFORE...
Therefore, if you want to be a REAL HACKER, you have to actually know something
about computers. If you want to control a computer, you have to know how to
tame the software which controls that com-puter - you have to understand very
fundamental things about its operating system.
Sure, a hacker may be able to get bv using so-cial methods and a tidbit of
programmmg here and there, but there is no escaping the fact that real hacking
requires real knowledge. And I'm talking about seV-taught knowledge. You have to
go out and learn this stuff on your own.
Does this sound intimidating? Then maybe you don't have what it takes to be a
hacker.<Hey, I'm talking Big Manuals here - thousands of pages long, and written
in the ghastliest corporate/tech-nical mumbo jumbo imaginable.>
Realistically, there is no way to make a 100% guarantee that a particular computer
system is safe from intruders. It is theoretically possible to break into any system.
A good hacker should be able to break into most systems. An even better one will
be able to get into all of them. And the absolute finest hacker will not only be able
to enter every com-puter he encounters, but will be able to do some-thing
constructive once inside to make the trip worthwhile.
I mean, it's one thing to hack one's way into an on-line database. It's another
thing entirely to fig-ure out how to alter records in that database, and to do so
without being caught.
If you want to have the ability to enter any sys-tem that you encounter and take
action once inside,
then you must become knowledgeable about its OS. At the simplest level that
means knowing the basic commands that any user of the system requires on a day-
to-day basis to interact with files, to send and receive mail, and to perform any
needed action on the machine.
A hacker needs to know the obscure commands as well, and should also be familiar
with any files, software and directories commonly found on ma-chines under that
OS. He needs to know how the manuals are structured and the "jargon" of the OS.
He needs to know who uses such an OS and how they use it. And he needs to
know the meanings of error messages.
But we still haven't gotten to the hard part yet. You see, all of the above is just the
tip of the ice-berg. After all, all of this information is easily avail-able from

standard sources such as manuals and design specification guides. What a hacker
needs to know about an OS is the secret stuff that doesn't come in the manuals, or
if it is printed there it is so technical and obscure that it is information deci-
pherable only by a select few. Those lists of "basic things a hacker should learn"
describe what the OS is and what it does. But a hacker - to effectively enter and
exploit any system he or she encounters - needs to know how the OS works, and
why it works as it does.
Operating systems are so huge that they can never be adequately checked to
ensure that every single bug has been worked out. They are some-times altered to
include features or functions that a particular computer manager finds desirable,
but those alterations open up security holes. Sometimes multiple programmers
working on different parts of the system don't communicate about vital as-pects
and so distant processes may explode if forced into contact. Additionally, the
software that is used may have been designed for the plain-Jane version of the OS
and so incompatibilities (and hence glitches) develop. Or two or more pieces of
software being used together may open up sources of insecurity.
The casual user is oblivious to all of these pos-sible security breaches. A hacker
may be oblivious to them, but if the hacker has a fundamental under-standing of
the operating system which underlies all these sources of intrusion, then that
hacker will, with a bit of thought, realize where the traps are and how they can be
usefully manipulated.
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Needless to say, this book is not going to sud-denly turn into an explanation of the
technical as-pects of every single operating system, and a true hacker wouldn't
want it to be. So, go out there and find some operating system you can get
acquainted with. Learn its basic commands, but then go a Step beyond that and
learn how those commands were programmed. Figure out ways you could simulate
the command without typing it directly at the OS prompt. What happens to
memory when the com-mand is executed? Are there ways to change mem-ory?
These are the kinds of things that are impor-tant to a hacker who wants to
accomplish big dreams.
Examples of such techno-oriented hacker meth-ods abound throughout the rest of
this chapter. The reason is simple and unavoidable: the best things in life are often
not free. You have to work hard if you want to do great and exciting things after
invading a system. Sure, you may find it convenient to learn certain things only as
the need arises, such as a particular shell programming language, or the way an
application works. But when you lack knowl-edge about underlying principles of the
operating system, you are hacking blindly - you are just as oblivious to the
exploitable faults and flaws of the system as any other user.
Let's get away from all this heady stuff for awhile and go back to the impetus for
this discus-sion of operating systems: After you get in, what the hell comes next?
Looking Around
What should you expect to find, once you've made it onto a system or network? A
whole lotta things!
There may be files to read, programs to run, or ways to move about from one
computer to another, or one network to another.
Try looking for backup files and files that have been automatically saved on a timed
basis. Some text editors leave behind files like this that are readable by anyone

who happens to pass by. If the sysadmin has been editing the password file, or
some other file containing sensitive data, you could be in luck. Electronic mail is
often not automati-cally deleted, and it accumulates in (perhaps hid-den) files on
disks. Deleted files may not be deleted right away, but become hidden or moved to
a spe-cial directory.
See if you can find evidence of security logs. One of the most common errors for a
user to make while logging in is to type the password at the username prompt. If
you can find a readable secu-rity log it will often contain records of these login
errors. For example, if George Washington tries logging into his UNIX account with
his password, "cherrytree," but he types a little too fast, the following ensues:
WashingtonUs [Enter]
ername:cherrytree [Enter] Password:
George realizes he has messed up. He has typed his name before the login prompt,
and he has put his password (quite visibly) on the "Usernarne:` line. He presses
Enter a few times to clear every-thing, but the damage is already done.
Somewhere in the administrative directories, there is a log file that reads:
Unsuccessful login of user cherrytree @ Tue,
Mar 24,1992,14:16:03
Now you just have to go through the various users on the system until you find the
one who uses this password.
Security logs may also keep track of files sent and received, errors resulting from
unauthorized commands, new accounts or new users being granted superuser
status.
Speaking of security, thefirst thing you should do any time you log in to an account
for the first time is try to get a sense of who this person is whose account you are
borrowing (assuming you don't already know). When you log on you will most
likely be greeted with a message telling you the last time that account had been
active, and possibly which location or server the user had con-tacted it through.
If the message tells you that the legitimate user logged in recently then you may
have a problem. Note the time of day the account was used and try to hack around
it. Try logging in two times simul-taneously on two separate computers and see
what happens. Do you get an error message the second time? Is it possible to
detect the presence of another
127
person using the account with you concurrently? You want to know such things
because you want to be able to deal with having the account holder co-incidentally
log on at the same time as you.
Let's look at this first scenario. You are logged into the account... the actual user
tries logging in but gets a "User hjones already logged in on port 116" message.
You have no way of knowing that this has occurred, but you can prepare for its
eventuality by sending an e-mail message to the ac-count, purportedly from the
system manager, and leave it unread. So if the legitimate account holder were to
log in she would find something like this waiting for her:
Message #01
From 1513 SuperUser

To AUUSERS@calli.poo.n-til
Some faulty wiring has led to problems with several of our port connection verifier
circuits in the subchart group C of the local network system. If you receive a
message upon login that you are already logged on, please hang up and try again in
a few minutes.
We are sorry about this problem and we are doing what we can to correct it, but
this will take time. It was a matter of choosing between a bit of inconvenience for a
while, or shutting down the system entirely. I hope you will agree it is better to
have some bugs in the sys-tem than no system at all.
We expect the problem to be cleared up before March 3rd. Thanks for your
cooperation.
Often users will have personal history logs stored in their directory. There may be
history re-ports detailing command activity, newsgroup readership, file transfers or
files deleted. These can show you when and how the legitimate user is us-ing the
system, and also the level of competence of the user.
If your account has been used very infre-quently, then you know that the actual
account owner poses very little threat to you - although it also means the system
manager is now a threat, since he will suddenly see tons of activity from an account
that had never before been active.
On the other hand, if the account holder is in there night and day, you will have to
be more wary of him than of the sysop - after all, any hacking you do from that
account will get lost in the shuffle.
Commands To Look For And To Use
Most operating systems come with extensive online help. On UNIX, you can type
"man com-mandname" to see the manual page for a com-mand. Also helpful is
"apropos" which will display a list of commands that are related to a given word.
For example, "apropos password" lists all the com-mands, programs and variables
that have some-thing to do with passwords. You can then use "man
commandname" to find out what each one means.
On TOPS machines you can type "help" or "help commandname" for on-line
information.
Process commands tell you what is being done on the system and, generally, who is
doing it. UNIX lets you type "ps -f` ' to see how other people are using the
computer. Using such commands will give you a feel for what options are available
to you. Also, it will show you which users have access on other computers, if they
are logged into them from the one you are on. If you're extremely lucky you might
even find an encryption key poised in the list of processes. If a person has typed
some-thing like "crypt key < filename" that entire com-mand, including the key,
will appear in the listing. Unfortunately, the crypt program acts to remove the key
from the listing once it is activated, but there is a brief period when the key is
public data, there for all to see. A "daemon" program could search for such
occurrences (See glossary).
"Telnet" is a program that allows you to connect to other computers. Earlier it was
mentioned that the account you've entered is most likely a low-ac-cess account.
The reason a hacker bothers with regular user accounts in the first place is to give
him or her a safe place to do real hacking. From that account you can do all the
things you would never do from your legitimate account, like telnet to Pen-tagon
computers and start a brute force attack. UNIX also has a "cu" (Call Up) command
which allows the user to call up a specified phone number.

Calling one computer from another enables the hacker to avoid being traced. It
also might be the
128
most practical solution to the problem of connect-ing to a certain computer, since
some computers can only be accessed through other networks.
File Transfer Protocol (FTP)
FTP is a program that allows users to copy files back and forth between two
computers, usually two computers connected via the Internet. Strictly BITNET
users will need to use e-mail instead of FrP to transfer files.
After typing "ftp" to start the program, one can input any computer address and try
to connect with it. A username and password will be asked for. Many sites offer an
anonymous FI'P directory - users can log in with the username "anonymous" and
have access to all the text files and rograms that the site administrator has made
available.
Often an anonymous FTP site is set up like a trading post. An incoming directory is
set up with anonymous write and execute permission, but usually not read
permission. Users can then upload files they want to share with others without
those others knowing the files are available. The system operator can evaluate the
files before making them publicly available.
One common security hole with anonymous FTP is that two auxiliary directories
called "etc." and 'bin" are often owned by the FTP account. If this is the case, and if
they are not write protected, any user could upload their own malevolent ver-sions
of system programs and batches.
Fun'N Games
You might see Xtrek or Empire, or any number of on-line, multiuser games
available on the com-puters you crack, especially those at colleges. Be-cause the
games are multiuser, passwords are re-quired to access them, and it should be
noted that often the password-storing mechanism on the games is not as secure as
it should be; the pass-words are sometimes placed in a plaintext file. We know that
people tend to use the same password wherever they go. Think about it.
The User Network
USENET is to local BBSs what the Taj Mahal is to anthills.
USENET is an Internet BBS that encompasses thousands of discussion groups and
millions of postings. On USENET, you don't just have a "computers" bulletin board,
you have boards talk-ing about software, about hardware, viruses, hack-ers,
individual operating systems and printers and spreadsheets and ethics and... you
name it. Each topic area is called a newsgroup. There are groups engaging in talk
about music, cars, sex, SCUBA diving, crime, parachuting, television, books, bes-
tiality, flowers - it makes one dizzy to think about it all.
Some newsgroups are moderated. That is, some controlling organization edits the
postings or picks and chooses which messages will be given display time. Most
groups are an unmoderated free-for-all.

One accesses USENET by running a news pro-gram such as "readnews," "news," or
"nn." You can read the posted messages, or write one of your own. Messages are
sent out to all other participat-ing sites worldwide, which means if you have a
question about anything, USENET offers a huge in-temational forum through which
to find an answer.
Becoming A Superuser
Breaking into a system isn't worth anything if you find yourself in an empty home
directory with such a low access level that nothing fun is allowable. Men you hack
into a low-level account belonging to a data entry clerk or some other restricted
user, you will want to raise your access to the highest it can go. This is
accomplished by doing research from the inside, spoofing, programming tricks, or
social engineering.
As far as research is concerned, you will want to look around the system you've just
penetrated and see what options are available to you. Read all files; run all
programs. Most technical hacks in-volve bugs in established software. Generally
this software is of a kind that interacts with other users' accounts in some way.
Thus mailing and "chatting" programs are susceptible, as well as text editors. If
you find a programming language of any kind you should be in Hacker's Heaven, as
there are hun-dreds of variations on programming tricks you can use while inside to
gain better access. Let's start with spoofing.
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Spoofing
Spoofing usually refers to sending electronic mail in such a way that it looks like
someone else was the one who sent it. Spoofing can also refer to any act whereby
a hacker impersonates another user. Let's stick with the first, more common defi-
nition for a while, and look at some ways in which spoofed e-mail can benefit the
low-level hacker who wants to make good for himself.
One prototypical scam is to spoof an e-mail letter from the system operator. Susie
User, a highly powerful person on the system, is on-line, going about her usual
business. She checks her mailbox and is surprised to find a letter has just been
mailed to her from the system administrator. The letter talks about how, because
of security breaches, they will now be issuing new passwords every six weeks.
"Your new password is D4YUL," says S.U.'s e-mail. "You can change it yourself with
the 'SET - PASS' command. Remember it! Don't reveal it to anybody! Computer
security is an important issue that can not be taken lightly!"
A few moments later you notice that Susie has issued a SET-PASS command, and a
few moments later you log on in her name, thus achieving her higher security
privileges. It works every time! The trick is, you have to know how to spoof to do
it.
Before you can spoof e-mail, you have to understand how such a thing is possible.
Now, if you've ever used any sort of electronic mail program, whether on a
mainframe or local BBS, you know that to send mail, the user enters basically three
pieces of information: destination, subject and the body of the letter. Some mail
programs allow fur-ther complexities, such as the inclusion of other text files or
programs, return receipts, etc., but let's just concern ourselves with the most
primitive of mail-ing programs, as those are the ones that get the most usage.

When you send electronic mail to another user, the computer automatically places a
heading on top of the letter, which identifies it as having come from you. To spoof
e-mail you will want to some-how change that heading, so it looks as though the
letter was written by the person in charge of the system.
Usually one sends mail by running a mail pro-gram. The mail program includes a
text editor and facilities to send mail to other users. But in many cases you don't
have to use a special mailing program to send mail. There is usually a fundamental
shell progran-uning command that allows you to send text or a file, into a file on
another user's direc-tory. This is what the mailing program does: it sends the text
of your message into a file called MAIL.TXT or something similar, and when Susie U.
executes her mail program, it will display the contents of the file MAIL.TXT.
As you can imagine, it is a simple task to open a text file, type in a header that
looks like a header from a superuser's letter, then add your own text to the bottom
of the file. Next you use the "send file" command to put this file into another user's
direc-tory. Make sure the directory you put it in is one with higher access privileges
than your own!
Sometimes the operating system itself foils this scheme. For example, one of the
Internet protocols requires the two computers involved with the mail transfer to
compose the letter headers. To spoof on the Internet, one would connect to a host
through port 25, which is how e-mail is transferred to a site. Normally only two
computers connect in this way; there may be security safeguards in place, but if
there are not, you can pretend to be a computer sending the commands to
generate an e-mail mes-sage. This includes "mail from" and "rcpt" which es-tablish
who the sender and recipient are. Use "help" to get yourself through this.
Earlier I mentioned that spoofing is also con-sidered to be any form of on-line
impersonation of another.
Many multi-user systems let users chat with each other by way of a command
called TALK or WRITE, or something similar. When you issue a TALK command, a
message appears on the recipi-ent's screen, saying that you wish to talk. If the
other user wants to talk with you, he or she issues the TALK command also. Then
whatever you type appears on the other one's screen and vice versa. It may also
be possible to filter the contents of a file onto another's screen by way of a TALK
command. The hacking possibilities are endless!
One popular trick is to TALK a message like, "SYSTEM FAILURE. SHUT OFF YOUR
TEW41-NAL WITHOUT DISCONNECTING TO PREVENT FURTHER DAMAGE.
SYSADMIN," onto another
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person's screen. When they hang up, you piggy-back a ride on their account.
As with e-mail spoofs, you can't actually use the TALK command to put text on
another user's screen. You have to go into the source code of the TALK program,
see how it writes to another screen, and use those commands. This bypasses the
safety features inherent in the TALK command. (If you use the actual TALK
command to send this sample error message, the other party will see that it's you
sending the message, not the Sysadmin. You have to emulate the TALK header
which announces the name of the user sending text. You also want to go down to
the fundamental "send text" statements because you don't want the user to have
the option of not talking with you.)
It's a recognized fact that spoofing accounts for a good majority of system security
failings, mainly because they're so easy to do once you've gotten on-line and taken
a look at the software source codes and manuals. Another trick relies on TALK-ing

a message that an intelligent terminal will un-derstand. When you use a TALK
command you aren't putting words into the OS prompt's mouth - the OS is simply
putting what you type onto the remote terminal's screen. One way to get around
that depends on the remote hardware. Some intel-ligent terminals have a Send or
Enter escape se-quence that tells the terminal to send the current line to the
system as if the user had typed it in from the keyboard. You can use TALK to send
a message that contains a suitable escape sequence to do naughty things like e-
mail confidential documents back to you and the like.
Not only e-mail and TALK, but other com-mands are also known to be rife with ways
they can be misused to a hacker's benefit. Anytime you come across a command
which allows interaction with another terminal, study it closely to see how it can be
manipulated.
Look at programs, too, to see if they can be used to communicate out of your own
directory. The GNU-EMACS text editor (used on UNIX computers) allows you to
send the file you are working on to another person's directory. If you happened to
name that file ".login",(Under UNIX, "Jogin" is the name of the batch file that gets
executed once a user logs into his or her account.) then whenever that user logged
on, that ".login" batch would execute. And if part of that "Jogin" included mailing
the user's secret stuff to your account, so much the better.
Cryptography And DES
Reverting to old tricks, brute force attacks can allow you to decrypt password files
on your own time, on your own terms. Even with your meager account you should
be able to copy an encrypted password file off a machine you've hacked and onto a
safer one. At the very least, you should be able to view the contents of a password
file, even though it is encrypted.
Then you compile a copy of the decryption software, altering it so it will read in a
word from a specially-prepared dictionary file, use that as a key, and print the
result. UNIX source code listings are available for every facet of the OS. Even if
you can't get a decryptor of the type used by the computer to code the password
(and other) files, you can still go to the manual, see which encryption algorithm is
used, and write a program yourself that follows that algorithm. Brute forcing
encryption keys on a password file is much faster than forcing one's way onto the
system in the first place. Soon you should have found a key that unlocks the code,
and soon you will have the superuser password!
Brute force may not always be a necessity. There is reportedly a well-known
inversion to the encryption algorithm used on certain OSs, includ-ing older versions
of VMS. Sorry to say, I don't know exactly what this inversion method is. I do
know there are ways to algorithmically reverse the effects of a "crypt" command in
UNIX. That com-mand uses the World War 11 Enigma coding algo-rithm, which
was devious for its time but no match for modern supercomputers. Sure, it still
takes a while to do the inversion, but it is possible to do it if you have a computer
with enough horsepower.
However, the crypt command isn't used all that much because everyone knows how
vulnerable it is. Mostly "crypt" is left around for sentimental rea-sons. The
encryptor that is most often used to en-code passwords is a version of the federal
Data En-cryption Standard (DES). The UNIX variation of DES is "defective" in that
brute force attacks for en-cryption keys are close to impossible. How does it defeat
brute force attacks?
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As we all know, UNIX password files are openly available for anyone to read, copy,
or print out, but the passwords themselves are stored in an encrypted form. Well,
that's not exactly right. The password file actually does NOT contain any passwords
at all. What happens is, when a user logs in for the first time and enters a
password, UNIX uses the first eight characters of the pass-word as an encryption
key to encode some constant (say, a long random number).
Another reason why DES was chosen to encrypt passwords is that when the DES
algorithm is implemented in software form, it is slow. This means it will take more
time to run a brute force attack.
Staying with this topic a bit, it's unsettling to note that the Data Encryption
Standard also may not be as secure as it was once believed to be. DES was based
on a security system called Lucifer, de-veloped by IBM for the National Bureau of
Stan-dards in 1973. Before being released as the USA's official (standard) code,
the top-secret National Se-curity Agency had their say in the matter, reducing the
complexity of the encoding algorithm and keeping certain aspects of its design
under wraps. This looked mighty suspicious! Why would the NSA go out of its way
to proclaim the code secure while simultaneously making it less secure? Critics
warned that a back door had probably been built into the system.
In early 1992, two Israeli scientists announced that they had found a way to beat
the system. If someone knows the encoded message, certain mathematical
techniques can be applied to infer the key used to encrypt the message. Then
other coded texts which use the same key can be easily read.
In any case, it is well known that much better codes have been produced since the
1970s.
Some systems make it difficult to brute force the plaintext out of an encrypted file,
because the en-cryption key supplied by the user is not what en-codes the text.
Rather, it is used to encode some random sequence of characters. Those
characters encode the text.
You don't have to be smart to be a hacker, you just have to be clever. But to crack
data encryption algorithms you must be clever, smart and mathematically-inclined.
Lucky for us people who don't have calculators for brains, there are so many other
ways to read encrypted files than by breaking the code! I'll stick with Van Eck and
his cronies, thank you.
Bit By Bit
Let's say you find yourself in some rinky-dink little account one evening, with just
about zero ac-cess to anything interesting. On this hypothetical system you are
able to read the passwords file, but of course to change it is out of the question.
You can see that your account's password has been encrypted (in the file) as
"fg(kk3j2." If you had the ability to load the password file into a text edi-tor, you
could replace the sysadmin's encrypted password with yours ("fg(kk3j2"), then save
the file. Well, naturally you can't do that. You could get as far as loading the file
into a text editor and chang-ing it: but to save like that is impossible without su-
peruser status. Or is it?
The system security may be such that it only makes validation checks at the
highest level of in-teraction. So the high level commands to delete, move, execute,
or alter files are disallowed if the user does not have a certain security clearance;
the actual machine level commands to move the read/write head to a particular
location, let's say, may not be halted in the least. If this were true for the whole
available storage arena, every file could be completely read or rewritten bit by bit.

If pro-gramming or disk maintenance software is avail-able to you on-line, you
might then be able to use it to alter individual storage locations - to change the
system administrator's encrypted password to your own.
On the other hand, you might find that security prevents even low level instructions
from being performed. Don't give up too soon! It may be that onl parts of the
storage arena have been protected, while others - due to forgetfulness, bugs,
impos-sibility or impracticality - have been left unsecure. If so, you may not be
able to change the passwords file, but perhaps it would be possible to move files to
another user's private directory, or to change files that are already there. This
opens up a whole world of possible Trojan horses and back doors.
If security seems to prevent all illegal access from taking place, perhaps it is
possible to trick a process with superuser security clearance into do-ing the work for
you. A simple program, such as a
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game, could be written, containing instructions to secretly alter passwords.
Compile and save the program, making access to it available only to superusers.
Then move the file into a public directory. Eventually some superuser will come
along and execute it, thus enacting the portions of your program which, if you had
run them yourself, would have resulted in error messages and perhaps a few more
ticks on the security log.
Program Employment
Most programs that are employed by hackers are of the Trojan horse variety. And
the classic Trojan horse example is one which uses the faults of others to achieve
its goal. Generally this means using undisciplined PATH commands.
Most modem operating systems allow you to arrange your files in an organized
fashion by the use of directories and subdirectories. This makes finding where you
left a file easy, but it causes problems when you get sick of typing in long
pathnames to change from one directory to an-other.
The solution is in PATH commands. A PATH command says to the OS, "if you don't
find that file in the current directory, look over there... Thenlook there.... And
there." In other words, you specify a path which the OS can follow to find files.
That way you don't have to be in a file's directory to ac-cess that file.
PATH commands are usually put into batch files which are run at login. They are
especially used on big machines which contain lots of files and tons of directories.
In those cases, especially if the user is a maintenance operator and needs ac-cess
all over the place, there might be a lot of direc-tories specified in the PATH.
Sloppy search paths, especially ones which look at all or most of the directories on a
system are of extreme importance to the hacker. The hacker starts by rewriting a
program that gets used often and putting a Trojan horse into it. The program is
then put into a directory that is likely to be in a super-user's path. A privileged
user or program, such as a superuser shell script, may innocently chance upon, let's
say, your "date" program instead of the It official" version stored in the OS
directory. It is ac-cessed, and your hidden code does its thing.
Trojan horses can do a lot of things. They can collect passwords, simulate login
prompts ( Also, think about Trojan horses in terms of the multi-user games
discussed earlier - obtaining those pass-words, etc.) remove read/write protection
from files, or fake system crashes (and when the user shuts off his terminal and
walks away, you type in the secret control code which causes the Trojan horse to

uncrash back to the user's account). Trojan horses should definitely make up the
majority of a hacker's tool kit. But there is another, different means of gaining
higher access by employing programs, and that is with the use of computer viruses.
Viruses
A virus is born from the cross breeding of three other families of programs: the
Trojan horse, the worm, and the logic bomb.
A logic bomb is a piece of code hidden within a larger program. Usually it is no
more than a simple IF/THEN statement. IF such-and-such is true, THEN do
something. Judging by the name, logic bomb, you can guess what that "something"
usually entails.
The classic example of a logic bomb being put to use is when a system programmer
is fired for in-adequate job performance, or for some other hu-miliating reason. A
few days after he walks away, the head honchos at the firm get a message from the
programmer: "Pay me X thousand dollars be-fore July 31st and I'll tell you how to
save your software and records from total annihilation." The programmer has, you
see, implanted a logic bomb that will detonate at that certain date.
A worm is a program with one purpose: to rep-licate itself. All it does is look at its
environment, see where it can make a copy of itself, and it does so. Then there are
two copies of the worm. Each of those reproduces, and there are four. Four quickly
become eight, and so on. Soon an entire computer or network is clogged with
hundreds or even thou-sands of unstoppable reproduction machines.
Then there's the virus. A virus comes from the mating of these two other breeds.
When a worm takes on a logic bomb aspect to it, you get a pro-gram that will
replicate as much as it can, and then explode when "something" happens. The
whole
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thing hides itself within an application program, as a Trojan horse.
Logic bombs are dangerous, but at least they are contained. Worms and viruses on
the other hand, are unpredictable. Therefore, I say a true hacker will never release
a worm, because they are too destructive with no purpose. A true hacker may
release a virus if it can move harmlessly throughout a system, erasing itself as it
goes, mak-ing sure it never backtracks to where it's been be-fore.
A virus can be programmed to e-mail pass-words to a specific address, or it can be
used as a battering ram to brute force new passageways into computer systems.
There are lots of ways in which hackers can use viruses, but it is difficult to use
them safely.
There have been rumors of a microcomputer virus which, if it exists, would gladden
the heart of many a hacker. The virus is called the AT&Tack Virus. Once it copies
itself onto a computer, it tries to find a Hayes brand or compatible modem. If one
exists, it silences the modem's speaker and dials a Preprogrammed number.
Apparently then whoever is at the telephone number it calls has remote access to
your computer.
To me, this seems like nothing more than a rumor. Indeed, as of this writing none
of the commercially available virus detection software makes any mention of an
AT&Tack Virus. Besides, it seems to me this sort of thing would work better as a
Trojan horse in a graphics display program, rather than as a virus.
Covert Channels

One of the fun things about using Trojan horses and viruses is the designing of
covert channels to get the data they collect back to you in some read-able form.
Consider a virus that attaches itself to the login program and thus collects
passwords. It does no good to have this virus halfway across the world with no way
to get back that list of pass-words it is reaping. One method has already been
mentioned: the virus can periodically e-mail you a list of passwords. Take heed not
to have that e-mail sent to any account where you can be identified.
It would also be a good idea to encrypt the mail before it is sent. One problem with
encryption is that a key is required. Anyone finding your virus or Trojan horse will
easily figure out what the key is and be able to interpret e-mail or temporary files
that the virus/Trojan horse produces. So you have to encrypt the key... which
requires another key... which means more hiding needs to be done... an-other
key.... Well, this could go on forever. Make the best of the situation.
If you're going to be encrypting anyway it may be easier to have your virus or
Trojan horse send the encoded data to an unmoderated newsgroup. Disadvantage:
You have to spoof the post, or some-one may notice that this user (who is
unknowingly activating your virus or Trojan horse) is posting a lot of "garbage" to
the group.
You may also have the encrypted file uploaded to the incoming directory of an
anonymous FIT site somewhere. Make certain files can be downloaded from that
directory, because as mentioned earlier, often the ability to download from such
directories is turned off for security reasons.
To send short messages (like a single password)(Normally a Trojan horse or virus
would send back to you three pieces of information: username, password, and the
address of the computer where that usemame-/password was valid. However, if
you targeted a,spe-cific individual by giving that individual sole access to your
Trojan horse, then only a password would be needed.
Of course, viruses and Trojan horses don't have to be messengers for only password
information. You may be a hacker, but you may also be a spy, a crasher, or who-
knows-what-else. As far as I know, the informa-tion you need covertly passed back
to you could be virtually anything.) you may have your rogue program rename a
world-changeable file to that message. By "world-changeable," I am referring to
the security protections placed on that file - set it to very low protection, so that
anyone can change its attributes. Your Trojan horse/virus will come into your direc-
tory under the disguise of various users from all around the network, and attempt
to rename that file to that message. You don't want your Trojan horse/virus to
generate an error message. (You can set up a process to constantly run in the
back-ground, monitoring the state of that file. As the file's name changes, the
background process stores the new name, then gives the file its original name,
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thus allowing another copy of your Trojan horse or virus the opportunity to send its
message.)
Other short messages can be sent a bit at a time. For example, the existence of file
X in a certain directory means that your rogue program is sending the digit one. If
the directory is empty, the file deleted, a zero bit is being transmitted. A
background process is running in your home directory to monitor the appearance
and disappearance of that file. When enough zeros and ones accumulate, the
program translates them into a character of the message.

The extended ASCII code uses eight bits to define a character. For instance,
01000001 represents the capital letter A. 01000010 is B ', and so forth. For your
virus or Trojan horse to send an eight character password, 64 deletions and
creations of file X would be needed. Those bits would be sent one at a time,
whenever the rogue program had the opportunity to do so unnoticed.
Get Out Of jail Free
Okay, all of that is fine if you've broken in by discovering someone's username and
password but what if the only access you've found to a machine is that of a
command account or information setup? Then you have to see what can be done to
break out of this jail of a program and get down to the level of the operating
system. Probably this will be difficult to do. It will be less so if you've done any
serious programming in the past.
As a programmer, you know what kind of bugs and errors crop up, and what kinds
of things to look for to make them appear. If you're stuck in an account that runs
an info program, let's say, you will want to try every unconventional, unexpected
thing you can think of, in the hopes that you'll find something the programmer
didn't think to guard against. Then hopefully you'll get an error in . essage and
crash out to the OS prompt.
Things to try:
Give bad, inappropriate, unrequested, or extremely long input to prompts,
especially alphabetic answers to numeric questions. Or when asked to supply a
number, that will be analyzed by a function, try an incredibly small or large one.
Try responding with break signals, either Control-Z, Control-C, or possibly Control-
P. Try executing "Find" commands that will search out of bounds of available
resources, or that will look beyond the alphabet. See if it's possible to set up
programs for nonexistent hardware or memory capabilities.
If there is any sort of text editing facility, such as a program to send mail to sysops,
do what you can to compose a batch file, and see if it's possible to send your
message as a command that must be executed. Also with text editors, try to
compose excessively long letters. If the editor has special text revision functions,
write up a huge paragraph then cut and paste a copy underneath it. Then cut and
paste those two paragraphs underneath, etc., until the program either crashes or
doesn't allow you to continue. If the latter, see what happens when you try saving
or sending the whole mess.
You may be in a program that is made to look like a simple operating system or
control program, essentially a menu with the list of options either unavailable, or
callable with a HELP command. Thus, you're given a prompt and asked to enter a
command. Some application commands allow appending to them the name of a file
on which you intend to work. For instance, to edit STORY.DOC with a word
processor, you might type the cornmand "WORD PROC STORY.DOC,` to run the
word processor with STORY.DOC already loaded in it. On an on-line system, try to
crash a program that allows such execution by giving it too much data, ("WORD-
PROC STORY.DOC FILEONE FILETWO...") or by giving it inappropriate data. Some
examples:
WORD PROC WORD PROC WORD - PROC directoryname WORD - PROC
nonexistent-filename
WORD-PROC /etc/date [or other command]

The "inappropriate data" tactic has been used successfully in the recent past.
Another bug that's been exploited is excess command stacking. Command stacking
is the placing of multiple commands on one line. Commands may be separated
with spaces, semicolons, slashes, or a number of other punctuation symbols. The
parser which interprets the stacked commands may break down if too many
commands are given it. The line editor may not allow you to enter so many lines
that this occurs, but through programming tricks you can
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probably get an unwieldy stack of commands sent as though from the keyboard.
If there is a language or compiler available, then it should be possible to POKE
some values into places that would be better left unprodded. Alternatively, you
might find yourself able to compile code into specific areas of memory, overwriting
the code which is impeding your progress. Or your code might cause the program
to jump to a new location, where further instructions can be carried out.
Finally, see if you can load a program into a mail writer or other editor, or into a
superzap program, and alter it so that when it rum, it will crash.
Bugs in software are most likely to occur if the software in question:
• Is new (i.e., version one or thereabouts, or being Beta tested).
• Was hastily slapped together to make some fast money or to comply with the
advertisements or demands.
• Has remained the same for years despite hardware or other changes.
• Is being renovated.
• Is not commercially available.
When you're hopping around on the networks you encounter, stop and read the
notes that accompany new versions of old software. These will generally list, not
just the improvements made, but sometimes the reasons for the improvements
(i.e., if there was an exploitable bug in the earlier version). By the time you read
the upgrade note, most sites will probably have already upgraded to the new
version, but given the tremendous number of computers running today, more than
a few won't have heard that a new version of their software has been released.
Returning To The Scene
The prudent hacker will build himself or herself a trap door to allow easy entry if
further penetrations are required. Mainly this means setting up a dummy account
to use in successive hacks. After all, there is no guarantee that the account you
used the first time will still be valid the next time you login, or that the password or
some other critical item won't have been changed, barring your entrance. If you
have gained access not through a password, but through some fluke hidden
command or technical means, you will definitely want to add a trap door just so you
don't have to go through all that rigmarole the next time you want to get in.
On many operating systems, programs can be set to run even after the user has
logged off. Sometimes the program can be put on a timer, to begin execution at a
specified future time. Writing a suitable program and then running it under one of
these commands can make your return easier to accomplish.
Mission Accomplished... Almost!
Hey! Look at what you've done!

You've done your research, found your computer, broken in, and now, you've
dabbled around inside. These four components are what hacking is all about. This
is what it means to be a hacker.
But there is also a fifth level of hacking to consider.
These first four parts had to be done in linear order, one following the other. The
final part is really not final at all. It is something you should be doing from the very
beginning, thinking about every step of the way.
Because you see, this thing you've done, this hacking, is illegal. And so you must
protect yourself.
So now let's look at what exactly it is about hacking that our society considers
wrong. Then we will see how we can keep on hacking forever unscathed. Finally,
we will tie up loose ends and look ahead to your future as a hacker.
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Part Three
AFTER HACK
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Chapter Thirteen:
This Lawful Land
There are lots of fraud investigators, special agents, Secret Service people, FBI
guys and all manner of local, state and federal enforcement officials roaming around
cyberspace, waiting to trip you up. There are also private citizens who love hacking
but don't love the idea of being criminals, so they hack the hackers, building up
dossiers, which they then turn over to the authorities.
Getting caught can make you famous, maybe even throw some money your way. It
can also take away a good part of your life, your money, your reputation, your
computing equipment, and your hopes for the future. Let's take a look at the laws
that cause this state of affairs.
State Computer Crime Laws
Every state except Vermont has explicit laws forbidding computer crime. They are
all pretty much alike in that they start out by defining what a computer is, and
defining various terms relating to computers and computer crime. Then they list
the specific offenses the law prohibits, and the penal-ties associated with those
illegal activities.
You can easily find out what the situation is for your state. just so you know what
kind of things cops and lawyers are talking about when they talk about state
computer crime laws, let's take a look at a typical anti-hack statute.
The Wisconsin statute on computer crimes ("Chapter 293, Laws of 1981, 943.70"
for you law-book gurus) lists eight possible naughty things a person can do with a
computer. The first six have to do with "computer data and programs," the sixth
being the willful, knowing, and unauthorized disclosing of "restricted access codes
or other restricted access information to unauthorized person[s]." The first five bits

of software naughtiness detail the willful, knowing, and unauthorized modification,
destruction, accession, possession, or copying of computer data, computer
programs, or "supporting documentation."
The final offenses have to do with the hardware aspect. "Whoever willingly,
knowingly and with-out authorization," either modifies, destroys, uses, takes or
damages a computer, computer system, network, equipment or supplies related to
comput-ers, is guilty under this statute.
There are eight different penalties listed, depending on whether the act in question
is consid-
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ered a misdemeanor or a felony under the law. The magnitude of the crime is
based on how much damage was caused money-wise, how much threat to others
there was, and whether the hacker did the deed with intent to defraud or obtain
property. Penalties range from life imprisonment (sheesh!) to various fines in the
$500410,000 range.
Traditional State Crime Laws
just because your state doesn't have a law that specifically forbids snooping around
in someone else's computer, doesn't mean what you're doing is completely legal.
Prosecutors will try to convict hackers on violations of any law, even if there's a
large void between the hacker's actions and the original intent of the law. In some
circumstances, the prosecutors may feel there is not a good enough case against a
hacker using the computer laws. For other reasons - such as a rural jury -
prosecutors will press the issue of guilt, but try to sidestep the technical aspect of
it. They will charge a hacker with infractions of traditional crime laws, such as
malicious mischief, burglary, larceny, and what-ever other nasties they can squeeze
into play.
There are problems applying traditional laws to modern "crimes," and the focus
changes from whether Hacker X is guilty or innocent, to whether Hacker X is guilty
of that particular crime. Can hacking be considered a kind of burglary? In a blue
collar computer crime, such as the theft of the ac-tual hardware, there is no
question whether or not a law has been broken. On the other hand, if a hacker
steals records from a database, do the bur-glary statutes still apply? What if the
hacker didn't actually deprive anyone of their information, but only made a copy of
it for him or herself? Is this a different issue?
These topics have been addressed differently in different court cases. If you are
ever unfortunate enough to be tried for hacking-related offenses, the judge's
decision will be based on the exact defini-tions of "software," 'burglary," and other
key words for your particular state. If the state has no com-puter crime statutes,
then "software" may not be defined; in that case it is up to the judge entirely to
decide what these terms mean.
Since we do have 50 states worth of laws to consider, in addition to federal laws,
space constraints dictate that we not list every single statute and definition that
might apply to a hacker's trial. For the specifics you will have to do your own
research into your state's laws. Here is a generalized overview of traditional
crimes, and how they can be applied to convict you of computer hacking. I want to
stress this point of "generalizations." All the definitions of law to fol-low are
simplifications of the laws throughout the land. Individual states add their own

personal quirks and nuances to these laws - minutiae on which both surprise
verdicts and legal loopholes are based.
Criminal Mischief
Also called malicious mischief, this is the will-ful destruction of someone else's
property. You may say to yourself, "Gosh, as long as I don't pur-posely go around
acting like a jerk, how can they convict me on that one?" Good question.
To be able to say that malicious mischief has occurred, three things must be
present: a real hu-man action, evidence that the action has caused damage to
someone else's property, and that the damage is observable to a bystander. That's
the traditional definition. Well, any bystander can see a smashed storefront
window, but how many "average bystanders" can easily see how an algo-rithm has
been changed in a program to allow ac-cess to anyone named "Borges"?
The thing is, a hacker may change software or password files to gain entry to a
system, but it is often hard to determine whether or not such an ac-tion has caused
"willful destruction" of that file. In-deed, the software may not actually have been
al-tered to any detectable degree, and the hacker him-self may not have done any
noticeable actions at all. Can one then honestly say that criminal mis-chief has
occurred? And yet, the hacker may have left the software in an altered,
"destroyed" state.
The answers to such questions remain to be adequately determined.
Burglary
For most states, burglary is the unauthorized breaking and entering of the real
property of an-other with intent to commit a crime. Again there is
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a problem, in that we have to decide whether or not to accept an operating
computer network as prop-erty. The act of entering one's usemame/password is
often metaphorically associated with that of un-locking and opening a door to one's
house, but does that analogy exist to such a degree that the unauthorized entry
into a computer directory is committing a burglary?
It is generally conceded that the attempt to prosecute such an act under traditional
burglary statutes becomes futile. It may become slightly less futile if there is a
clear intent on the hacker's part to commit a crime. Again, make sure the world
knows your intentions are benign, and be sure to follow that path.
Of course, the physical breaking and entering of a building, with the intention of
using the comput-ers there to hack, is a more clear-cut matter. Don't expect to
wiggle out of that one on as many techni-calities.
Fraud
Fraud is easy to define: any sort of deception, cheating or unfair behavior that is
used to cause injury to another person. Using someone else's password is fraud,
since you are falsely represent-ing yourself, and the "injured person" (computer)
reasonably believes you to be that person to the ex-tent that you are given
privileges you should not have received.
But to be convicted of fraud it must be shown that because of the deception, the
victim had dam-age done to him or her. What happens in the case where a

computer manager knows it's a hacker on the line, and yet the manager is unable
to prevent damage from occurring? Since there is no deception, there is no fraud.
That may be intent to defraud, and perhaps not fraud itself.
Social engineering is clearly fraud if informa-tion gained from the exchange is used
to enter a computer, and some injury can be proven. Actu-ally, fraud is universally
cited in any instance of computer crime, no matter what methods were used or
what the outcome of the "crime." You can see then the importance of not causing
"injury" to a computer. In all of these cases, it is essential that it can be
established that no damage (or alteration) was done, and none was intended.
Larceny
Larceny occurs when two conditions hold true: A piece of property has been
criminally taken and carried away from another person, and the inten-tion of so
doing was to permanently deprive the owner of his or her property.
Again, problems arise when applying this to computer hacking. Think about a case
where a hacker inserts a GOTO statement in a program to bypass the section where
the program asks for login information. Has the hacker effectively deprived the
administrators on that system of that section of code - that piece of property?
Addi-tionally there is the problem of determining if the intent was to leave the
GOTO in permanently, and not only that, whether or not such an action consti-tutes
"taking" away of property. After all, the in-termittent code is still there, only the
access to it has been temporarily eliminated.
Larceny may be applied to the stealing of time on a computer, to stolen telephone
service or elec-trical power. In these cases it would seem the law-yers are doing
their best in a trying situation - a situation in which they realize the hacker has not
done any harm, and yet they want to symbolically punish the hacker for invading
their computers.
Theft Of Trade Secrets
Theft of trade secrets - also called "misappropriation" of trade secrets - may be con-
tained in the larceny laws of the state if a trade se-cret is defined as a kind of
property, or it may be the principal construct of its own statute. Misap-propriation
of trade secrets might be the better of the two names, as it more accurately reflects
the na-ture of the law: either the physical taking of secrets, or the unauthorized
copying of them, may be viewed as a violation.
So if a hacker has printouts of some top secret laboratory reports, that information
has been mis-appropriated, copied by an individual unauthor-ized to do so.
If this law is subsumed into the general larceny statute, a prosecuting complication
might arise. We are then back to the question of whether or not it
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can be shown that the hacker intended to perma-nently deprive the owner of his
property. We both know that computer hackers generally don't have any intention
of deprivation - just learning. We know that, but we can't expect judges and juries
to understand.
Finally, let's end this section on a good note. If the accused hacker leaves no trace
of his or her en-tering a system, then it is typically the case that theft of trade
secrets can not be seriously consid-ered as having taken place. Thus, hackers

should make certain that all files and printouts which con-tain data that one might
regard as trade secrets, are either purged, burned or hidden very well.
Receipt Of Stolen Property
Let's describe this one by mentioning its three parts: (1) The stolen property must
have been re-ceived by (2) someone who knows or should rea-sonably suspect that
the property was stolen, and (3) the receiving has been done with the intent of
permanently depriving the owner of his property.
As with trade secret theft, ROSP may be in-cluded in the larceny laws, or it may
have its very own statute to call its own. Regardless, ROSP is a good crime to catch
hackers by. Here's w :
ROSP is applicable for almost any stolen prop-erty or "property," including trade
secrets, infor-mation, goods and services, high credit ratings (been hacking TRW
lately?), computer time, pass-words, and files. If you've got any of these, or any-
thing else for that matter, you've got ROSP to deal with.
Theft Of Services Or Labor
Under False Pretenses
Theft of Services Under... Boy, I thought I had to abbreviate when discussing
Receipt of Stolen Property! TOSOLUFP is basically a form of larceny whereby you
trick someone into letting you have something. For instance, TOSOLUFP might
occur when a hacker gets access to an on-site computer by showing a guard a fake
ID badge.
Similarly, any false representation of a fact with the intention of obtaining the
property of another is TOSOLUFP. Additionally it must be shown that the victim's
judgment relied on acceptance of that false representation and because of that
reliance, suf-fered some injury - such as loss of computer time or monies which
would be paid by a legal user of the system.
Interference With Use Statutes
If someone does something so another person can't use his or her property (with a
resulting loss to the property owner) then it is said that an "interference with use"
statute has been broken. In the hacking sense, if a cracker were to change
password files so others couldn't log on, or tamper with a piece of source code, or
use another person's usemame and password, an IWUS may be said to have
occurred. Sometimes these are called anti-tampering laws.
As we have seen with the other traditional laws as they apply to hacking, there are
of course no clear ways to overlay centuries old terminology onto modem situations.
An IWUS can apply even if there is no visible damage as a result of tampering.
Even the installation of a back door may be pun-ishable, regardless of whether
other users know this illegal mode of entry exists.
Traditional Federal Crime Laws
A crime may become a federal crime if it takes place on or involves federal
property, or if there is a vested federal interest in the crime. There are fed-eral
laws which don't necessarily refer to comput-ers, yet are acceptable for use in the
prosecution (persecution?) of computer hackers. Note that these laws, as well as

the laws described in following sections, are applicable only when the computers
you hack are related to the federal government in some way.
Conspiracy
Conspiracy (aka 18 USC #371, if you like numbers) takes place when two or more
individuals combine to agree upon or plot an unlawful act, or to commit a lawful act
in an unlawful manner. The law goes on to state it is unlawful for these two or
more people to plan to defraud the US government, or any federal agency.
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This means that a bunch of criminals who use hacker's techniques to make money
appear in their checking accounts will be accused of conspiracy if the bank or
financial institution involved is a mem-ber of the Federal Deposit Insurance
Corporation.
In any case, if you are a member of any sort of group which discusses hacking, or if
you've ever discussed hacking or other illegal activities with anyone, you are a
potential victim of this law.
661, 2113, 641, 912, 1343, 1361, Etc.
Other federal laws may also apply in select cases of computer hacking. Applicability
of these laws depends on the nature of the "crime," what computers were being
hacked, where the hacking took place, and how the hacker went about break-ing in.
For example, laws 18 USC 661 & 2113 have to do with thefts committed within a
special maritime jurisdiction and burglary of a bank respectively. Other laws deal
with post offices, fortifications, harbor-defense areas, and federal property in gen-
eral. These are special laws that will apply only if you have, let's say, "burglarized"
the information in a post office database, or committed some other special-area
offense.
United States Code 641 applies to the theft of federal property (is information
property?) or re-cords. USC 912 makes it unlawful to obtain "a thing of value" by
impersonating a federal officer or employee. I would guess entering a federal em-
ployee's password is considered impersonation.
Number 1343 on the books says you can't use wire communications to execute or
attempt to de-fraud or scheme to obtain property under false pre-tenses, when the
message crosses state lines. 1361 prohibits malicious injury to federal property,
and 2071 disallows the concealment, mutilation or re-moval of public records. All of
which a computer cracker is likely to do, if on a federal computer.
There is law after statute after law, all dealing with specific issues like these. It
doesn't seem worthwhile to go through every last one of them. Suffice it to say, if
you get caught by the feds, they have a lot of legalese they can use to say why
what you were doing was wrong. I'm not saying you should go out and memorize
every bill that's ever been passed that might have some remote connection to
computer law. I'm saying you should realize that computer hacking can be a risky
business. Use your head. Don't make the mistakes that others have made. If
you're lucky, you'll be hacking with-out harm for as long as you want.
Federal Computer Crime Laws, Or:
It's 10:30, Do They Know
Where The Hackers Are?

Finally, there are the federal laws which specifi-cally relate to computer crime that
one must be wary of. The Counterfeit Access Device and Com-puter Fraud Act of
1984 (18 USC 1030) was the first law that explicitly talked about computer crime.
As you might expect, it is a law that can be applied to just about any government
hack. It prohibits un-authorized access to data stored on any "federal in-terest
computer," and specifically mentions finan-cial records and national secrets as info
not to mess around with. This law allows for fines up to $10,000 or up to 10 years
imprisonment if it's a first offense.
Two years later, two computer crime acts were passed by Congress. The Computer
Fraud and Abuse Act of 1986 defined more situations in which hackers could be
prosecuted, by talking more about financial houses and medical records, targeting
computers involved with interstate crimes, com-puters belonging to certain financial
institutions, and other federally owned computers. There are also provisions for the
trafficking in passwords with intent to defraud computer owners. Most in-teresting
to the hacker, I believe, is that The Com-puter Fraud and Abuse Act of 1986 makes
it illegal to use other people's passwords, or even to use one's own password
improperly - that's where the "fraud" part of the title comes from.
One sort of strange requirement that this law makes is that it can only be applied to
crimes where the victim has lost $1,000 or more due to the crime. Since you are
going to be hacking under a set of ethical constraints, this law doesn't apply to you
at all then (i.e., no computer you hack will lose any-thing from your explorations).
This facet of the Act is made even more interesting when you realize that the
Senate Judiciary Committee, in their report on the Act, explained that a cracker
doesn't have to actually steal data to be prosecuted under the law
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- he or she only has to read the data. Makes you wonder what they're thinking
since it's beyond my comprehension how anyone can prove that reading some data
caused $1,000 worth of damage. But then, I'm no lawyer.
The Computer Security Act of 1987 is a do-nothing law that requires security
standards to be developed for classified and unclassified federal data, and requires
that security plans and periodic security training be implemented on federal com-
puter systems containing sensitive information.
Conclusion
I was going to apologize to all the lawyers out there, for the way I've manhandled
these descrip-tions of all the above laws. But really, why should I apologize to
lawyers?
Now let's talk about what we as hackers can do to protect ourselves; then we won't
have to worry about any of the above.
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Chapter Fourteen:
Hacker Security:
How To Keep From Getting Caught

Hacking is fun. Hell, it's exhilarating. But it's also illegal, sometimes immoral, and
usually pun-ishable. Even if what you're doing is perfectly inno-cent you'll be hard
pressed to find an acceptable ex-cuse for it in court. The very least that might hap-
pen is the security holes you utilized the first time around might get patched up.
More serious pun-ishments inflicted by the courts can include com-munity service,
fines and even prison, as we've seen. Informal punishments include the unofficial
destruction of your equipment by law enforcement officers, and being blacklisted
from tech-related jobs.
Consequently, the prudent hacker has two goals in mind while hacking. Number
one: don't get caught. Number two: if you do, don't make it count. This chapter
will present strategies the care-ful hacker will follow to ensure both situations are
true.
Hacking - to use one's curiosity about corn-puters to push them beyond their limits
- involves not just techrrical knowledge but also the hacker's mindset. Part of the
mindset must deal with keep-ing oneself safe, or else the rest of it has been all for
naught. Accordingly, the strategies here should not just be known rotely and
followed, but expanded upon to apply to new situations. Remember, there have
been many computer criminals who've been sent to prison. True, some have even
hacked while in prison. Some even learned to hack in prison. But you don't want
to go to prison. So when you're on-line, in public, in private, or just living through
your life, make sure you apply these guidelines.
In Researching
There may be local ordinances in your area forbidding machines or people to
continuously dial up numbers and disconnect, as with an autodialer program which
searches for dial-in lines. If you make the calls yourself it's better to say a simple,
"Sorry, wrong number," than just hanging up and annoying all those people.
Remember the 'Itpers-prosit rule: The more people you get angry at you, the more
likely it is you'll be persecuted, and the more likely it is you'll be prosecuted.
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In Social Engineering
Some social engineering and most reverse engi-neering requires authorized user
contact over the telephone or through the mail. This is obviously risky since you
are giving out your address or tele-phone number to people whom you are about to
defraud. Hackers have utilized several ingenious methods to overcome this
problem.
Once I found a small business with a technical-sounding name that would be closed
for a few weeks over the summer. By doing some hacking, some research, and
rubbing my lucky rabbit's foot I was able to come up with the code that released
messages left on their answering machine. That gave me a way to have people
contact me without them knowing who I was.
I put up some phony advertising for a com-puter network, instructing people to call
and leave their name and vital data. I could call up the ma-chine whenever I
wanted, punch in the magic code and listen to those messages. When the store re-
opened, I called them up, saying I was from the phone company. I told the store
owner that some lines got crossed, so they n-dght get some weird calls.
Some hackers will simply change a pay phone to residential status and work out of
there.

In order to work a social engineer through the mails, you could rent a private mail
box or mail drop. One hacker found a cheaper solution. He noticed that the P.O.
Box underneath his in the college mail room was always empty. Apparently it was
unassigned. The mailboxes are open in the back so workers can stuff the mail into
them. This hacker took an unbent clothes hanger and a metal clip, fashioned them
together into a grabber that he could slide into his box and go fishing into the
mailbox below his. Later I showed him how to de-termine the combination of the
box, so he wouldn't have to do all that. For a long while the box re-mained unused,
and he was able to get all the se-cret mail he wanted sent there.
Dialing In
"If you don't want it known, don't use the phone."
- Nelson Rockefeller
When you're new it may be okay to dial up re-mote computers from your house,
but once you've been around a while you'll never know if your phone is being
tapped or your computer usage be-ing monitored. So when you're past your
hacking childhood, make sure to never make an illicit call from your own house, or
from any number that can be traced to you.
Even when you are new to hacking, you could be in trouble. Imagine if you become
a regular on the TECHRIME-USA BBS, right about the time an FBI officer is planning
to bust the sysops for con-ducting illegal business on their board! You don't want
to get involved with that, especially if you haven't done anything illegal. Even
scarier than that are serni-reliable rumors which have been cir-culating through
branches of the technical under-ground which imply that the phone companies
routinely monitor and record modern conversations which pass through their lines.
This is supposedly done automatically by detectors which listen for modem tones,
and will then turn on a recording device to keep a record of the call. Even if the
gos-sip turns out to be false, consider this: (1) We obviously have the technology to
do such a thing and, (2) it is well known that the NSA records many, many phone
calls.
So... If you must associate with known com-puter culprits, or with established
hackers, do so as covertly as possible.
Not calling from your house means calling from someplace else. That means you
may want to splurge for a portable laptop computer. While you're at it, buy an
acoustic coupler and an external modem to go with it. All this should run you about
one or two thousand dollars - a lot less than the cost of retaining an attorney to
defend you in court.
The acoustic coupler is necessary because not every place you hack will have a
telephone jack to plug into. The external modem is needed to plug the coupler into.
While many laptops come with mo-dems included, they are generally internal
models, and so can not be coupled to a telephone handset.
Now that you have your equipment, where should you take it? There are plenty of
places. At night and over the weekend you can sneak into many big office buildings
and, if the right door happens to be unlocked, sit yourself down at a cu-bicle and
chug away.
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Two summers ago, I was walking past my local municipal center a little past 9 p.m.,
and I noticed that every office had their windows open. Every of-fice - at night!

Their air conditioner must have malfunctioned during the day, as it had been in-
credibly hot. Needless to say, if I'd been in the hacking mood I would've scrambled
through a window and hooked up my portable to a tele-phone. I could have been
making illegal computer B & Es while making a physical B & E, all just a few doors
down from a bustling police station - and with no one being the wiser.
If you have money laying around, or if you have a hacking expense account, you
can always hole up in a hotel or motel to do your hacking.
The money problem is one which gets to hack-ers in other ways. Phone bills add up
fast, which is why most serious hackers are phreaks too. A phreak is someone who
hacks the telephone net-works. One of the major aspects of phreaking is the
producing of code tones which signal the telephone system to perform special
functions, such as place long distance calls for free. Phreaking is definitely a major
area for hackers to investigate, and the tele-phone system - and especially the
computers which run the system - is something which all hackers should become
intimately familiar with.
Many hackers will say that any hacking other than hacking the computers which run
the tele-phone system is child's play. This is true to some extent. The telephone
computer networks are in-credibly large, sprawling, wonderful masses of in-tricate
functions, enormous databases, technical operations and blinding wizardry which
makes hacking anything less look pitiful.
Once the phone line leaves your house it goes to a local switching center. This
center controls all phones in your neighborhood, which may mean as many as
15,000 telephone lines. Each neighborhood switch is managed by its own
computer. These computers are the essential targets of the phone company
hacker; if you can access the computer, you can access every phone that it
switches. You can turn phones on and off, reroute calls, change numbers. You
could, if you were not a hacker, wreak quite a lot of havoc.
There are also switched networks which con-nect the computers that run switches.
From there you can go to regional maintenance systems such as COSMOS (which
sends out instructions to create and HI phone numbers among other things) and
MIZAR (the local MIZAR actually does the work that COSMOS sets up).
Once you've gotten familiar with the intricacies of these telephone computers, you
can use them in ways to protect yourself. For instance, you know you probably
don't want to place hacking phone calls from your house. What you can do is
connect to a neighborhood switching computer, take the phone numbers of some
local pay phones, and de-activate their need for coins. You then use the pay
phones to call or hack any place in the world.
Or you can use a MIZAR - which, as far as is known, does not keep records of its
activities, unlike COSMOS - to temporarily change your pre-sent phone number to
that of a nearby church. If your call gets traced, you'll be sending the feds on a
wild goose chase.
I want to make the point that dialing in to a re-mote computer is not as safe as it
feels. Communi-cating through a telephone or through a computer sometimes
gives you a false feeling of protection, especially when you become good at hacking
and phreaking, and turn from confident to cocky. Don't let that happen to you.
Remember to always follow these safety rules.
Don't set up patterns of behavior. Always call from a different place, at different
times of day.
When is a good time to call? Ask hackers this and each one will give you a different
answer. Late night is good because system administrators will probably have gone
home already - but then, so too have most valid users, so you'll stand out like a
clown at a funeral. You can try hiding yourself within the bustle of heavy usage

times, like mid-morning and afternoon, but then the main-frames will be at their
slowest, your activity can easily still be noticed, and the account you've hacked may
be unavailable for your usage. There really isn't any perfect time to call. Some
research into how the company structures its computer guard duty may help.
Time how long you're on the phone with a ma-chine. A phone trace is
instantaneous if you're lo-cal, and takes just a half a tweak longer if you're calling
from far away. But it's still not wise to stay on a single line half the day. Move
around a lot, calling from different phone numbers, to different
147
access numbers. If your target has multiple dial-in lines, randomly choose from all
of them.
Laptop Hints
Since you'll be calling from who-knows-where on your portable laptop, here are
some suggestions to help you get connected.
When in unfamiliar domain, such as an office, hotel, schoolroom after hours, or
otherwise, your laptop is of infinite value - so long as you can get it to work. Never
plug your modem into an unfa-miliar phone setup until you've verified that doing so
won't bum out your equipment. Many offices have installed their own electronic
phone systems, called PBXs, to facilitate special functions such as in-house dialing
and phone menus, or to block certain phones from making long distance calls.
Some of these PBXs place a current into the telephone wires that is powerful
enough to damage your delicate modem. To see if the line you have in mind is
safe, try plugging in a really cheap phone first. If it works, your modem should,
too.
PBX-networked phones may not work with your modem because of special audible
or numeric codes used in local routing procedures. If you get a dial tone on your
cheap test phone but your mo-dem won't work, you can assume that it's the PBX
system at fault.
To correct the problem you have to plug the modem into the phone jack, and
connect the room phone (not your cheap one) to the modem (you may need a
special double port for this). To use the modem you place the call using the room
tele-p . hone, and when you hear remote computer ringing, turn your modem on-
line and hang up.
Alternatively, devices can be bought to process signals as they go between the
telephone handset and the modem. The device converts ordinary mo-dem signals
so they will work on digital systems such as a PBX. This may be a more suitable
alter-native if you find yourself having to bypass PBX phones a lot.
Sometimes you can find yourself in a place with a telephone, but no plug-in jack for
your modem. For instance, if you are using the phone from a public fax or
automatic teller machine. In these cases, unscrew or pry Off the mouthpiece of the
phone and use a cable with attached alligator clips to connect the red and green
wires from your modem wire to the two silver mouthpiece contacts in-side the
telephone handset. This can easily generate a poor signal, so if you have the actual
telephone (not just the handset) available for vandalism, take apart the entire case
and clip your red/green mo-dem wires to the red and green cable leads from the
telephone's transformer. You will then have to hold down the switchhook on the
telephone to place the call.

Your On-The-Road Kit
Make sure you have this stuff with you when you go hacking on the road:
• A laptop, or otherwise portable, computer. Must have a modem. Preferably two:
an internal, and an
external with acoustic coupling cups.
• One small, cheap, reliable telephone for testing line voltages. You can use a
commercial tester for this, but
the phone comes in handy in places like motels, where you may want to connect
to a telephone but the
acoustic coupler won't fit on the phone they supplied.
• An extra phone cord, with an RJ-11 modular clip at one end (the standard, square
telephone plug-in
thingy) and with alligator clips at the other end.
Wire cutters, screwdrivers, and assorted coil cords with various size ports.
System Tiptoeing
Even the best intentioned, the most honorable and nondestructive of hackers are
thought of as evil by the managerial population. This means that if you're caught
breaking into computers that don't belong to you, expect some trouble. Even if the
hacking you were doing is completely benign you are likely to be punished in some
way. I've seen re-Ports that estimate the cost of computer crime per year is $3
billion to $5 billion dollars - and that's on the low end. Other sources list figures as
high as $100 billion.
Even the $3 billion figure, to me, seems pumped up for insurance purposes, but the
people who run businesses and government don't see it that way. Government and
industry people will realize that most computer crimes go unreported,
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and so the true cost is likely to be much higher than the official estimate. Even if
these dollar amounts are bogus, that's what people believe, and so they will be
even more inclined to prosecute someone who they believe is contributing to that
multi-billion loss every year.
Let's take a brief interlude here and examine the case of the Greenwood Family
Hospital BBS.
"Pretty Theft" is the name of a hacker I used to communicate with infrequently.
One day she sent me a message on a BBS asking if I knew how to get into the
computers of a certain hospital that was in my area. I was puzzled, because that
hospital was the easiest thing in the world to get into - in fact, it was one of my
earliest successful hacks.
When you logged onto the system, you were greeted with this informative message
(names and numbers are fictitious, of course).
Welcome to GFH-NET!
300-2400 baud (123)456-7890
GREENWOOD FAMILY HOSPITAL
GFH-NET IS MAINTAINED BY ROGER CORNWALL AND HAROLD LIPNICK QUESTIONS
OR COMMENTS? E-MAIL TO THEM!!!

WHAT IS YOUR NAME? TYPE IN FIRST AND LAST:
WHAT IS YOUR PASSWORD? TYPE <RETURN> ON A
BLANK LINE IF YOU DON'T HAVE ONE:
A few months after I began actively hacking, I was using my computer and
watching the evening news when a story came on about the governor breaking his
arm and being rushed by helicopter to a hospital. I thought to myself, "Hey,
hospitals must use computers, right? I can probably get into one!" So I got the
supposedly private number for the Greenwood Family Hospital Network, and I called
up, and I got that welcoming screen. Guess what I did next?
It's not too hard to figure out what I did! Natu-rally, I typed in ROGER CORNWALL
for my name. Unfortunately, the real Roger Cornwall had a password of some sort;
pressing Return on a blank Me just got me an error message. So I tried HAROLD
LIPNICK. Again, no go.
I went into the kitchen, got out the phone book, looked up the telephone number of
Greenwood Family Hospital, and I called it. A woman an-swered:
"Greenwood, may I help you?"
"Yes, please," I said, "Is Tom there?"
'Who?"
"Uhm.... There's some guy there I spoke with earlier... Your supervisor or
somebody?"
"Lee Brown., you mean?" she asked.
"Oh yeah, I guess that's it. I don't know where I got Tom from. Uh, is he there?"
"Nope. Lee left at five."
"All right, thanks."
"Bye-bye."
I went back to my computer and called back GFH-NET and tried LEE BROWN for the
name. Once again, I was out of luck. However, after a few more phone calls to the
various numbers listed for the hospital, I came up with a guy (a resident) who had
not bothered with a password.
GFH-NET turned out to be nothing special after all. It had nothing to do with
hospital billing, pa-tient records, or anything else pertaining to the ac-tual running
of the place. Mostly it was like a doc-tor BBS. From what I could make of it, it was
medi-cal students discussing problems with the doctors on the system. No file
transfers or anything; just a very simple messaging system. It was no big deal, but
it was fun to get into.
The next day I looked through the doctors in the yellow pages, and I found about
eight listed who had Greenwood Hospital addresses. Out of those names, three had
no password.
So anyway, I was puzzled as to why Pretty Theft couldn't get on there. I called it
up for the first time in years, and to my surprise found this nasty logon screen
awaiting me:
USE OF THIS SYSTEM IS
RESTRICTED
TO AUTHORIZED PERSONNEL
ONLY!
EVERYONE ELSE MUST HANG UP
NOW!

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All useful information was gone! AU that re-mained was an angry note and a non-
useful arrow prompt.
I tried some of the old names I'd figured out way-back-when, and found that all of
them had passwords now. I tried some more social engineer-ing, but everyone I
spoke to kept their mouths shut about everything. (Later I was able to get onto the
real hospital system with the help of some nice re-ceptionists in the administration
department.)
I e-mailed a letter back to Pretty Theft. I asked her what had happened there. The
next day I got her reply:
Last month a friend of mine was in the hospital, so I wanted to see if I could change
his bill. I remembered you giving me the number two years ago or something, so I
looked it up in my book and I was surprised I still had it. I knew the name of my
friend's doctor, and when I was there visiting him, I got the names of lots more
from the paging system (you know, "Calling Dr. Bower...") and from charts on the
walls. Then I went on the system and was try-ing all these names, when the sysop
came on and threw me off. Every time I tried getting on after that he kicked me
off. Next morning at about 8:00, 1 finally got on. One of the doctor's names I tried
had the name as a password too. Well as I guess you know, I couldn't change my
friend's hospital bill, but I couldn't do any-thing much else either... after giving my
name and password, it just froze. That night I tried it again, and there was a
message before it asked for your name. It said, MOST OF THE IM-PORTANT FILES
HAVE BEEN DELETED BY SOMEONE OR SOMETHING. THE SYSTEM WILL BE DOWN
FOR A WHILE - ROGER. A week later I tried it again, and the phone just rung. I
didn't do anything to it, but I guess the sysop thought I or someone else deleted
the files. A few days ago I called back for no reason, and, well, you know. I guess
they got smart?
Yes, Pretty Theft was right. They had gotten smart, and because of it, security was
tightened. It is for this reason that hackers should not announce their arrival to a
system, nor do anything to attract anyone's attention. There is only one case,
really, when you would want to show yourself to the system operator, and that is
when you've found out everything there is to know about a system and are never
going to call back again.
Incidentally, Roger and Harold had gotten smart in some respects, but remained
dumb in oth-ers. Through continued perseverance I was able to get onto GFH-NET
again. As it turns out, I'd gotten smarter too; the medical conversations between
doctors and students seemed a lot more compre-hensible than they had been just
two years before. Maybe it was the students getting dumber?
There was also an old bulletin posted from one of the sysops. It explained as much
as he knew about what had happened (which wasn't much). mostly it said that
certain files were deleted, and many of the bulletins were replaced with obscene
musings on female anatomy. From what he said, it sounded like the files could
have been erased by either a clumsy system operator, or perhaps a ma-lignant
hacker. I did a little investigating, and found that although it was not listed in the
main menu, pressing 'T" brought me to a defunct file transfer system. With a few
minutes of thinking, it was easy to see how someone could've uploaded a program
that would delete whatever files were in the root directory after a rebooting of the
system.
The next day I typed up a long letter to the sy-sops at the hospital, explaining
everything, what they could do to correct the problem, and how other security
breaches could be curtailed. I signed it, "Sincerely, Polly Wanza Hacker." Then I

called back the BBS and uploaded it to them. Soon after, I got this message from
Pretty Theft:
"There's a new logon screen at the hospital. It says: "THANX POLLY! - SIGNED R.C.
& H.L."
I couldn't have been happier.
Lessons From The Hospital
You already know system operators don't want you on their system. That's why
you have to hack in the first place. But if you make it known that you're there, you
will compound your difficultiesconsiderably.
On GFH-NET, the sysops went crazy when they realized their computers were being
abused, and they made it a lot harder to get into. On a little BBS like that, you
might not care whether or not you get in, but if you're dealing with something big
150
- like some government agency - you don't want to start messing around.
If you do show yourself in any way - like by a million log entries of "USER FAILED
LOGON PROCEDURE" from when you tried every word in the dictionary as a
password - the sysops are go-ing to get concerned, at the very least. Concerned
sysops mean no information will be given out over the phone. It may mean
changing every legitimate user's password, or cleaning up dead accounts that might
otherwise facilitate entry.
Alternately, if you have a nice feeling about a certain system, and don't want to see
it get hurt (and you don't mind possibly eliminating your chances of ever getting
back on it), you would be wise to consider informing the system operators about all
the little quirks you know about their precious system.
Many times, they won't believe you. They won't even bother trying what you
suggest they try, either because they have a huge ego that can't be wrong, or
because they think it's some kind of a trick, or god knows why else. But if they do
believe you, and they take your advice, they will be quite grateful and, if you ask,
might give you a low-level account on the system, or some handy tips. Tell them
you'll be their unofficial security advisor. Some of them can be quite good about it,
though others will think you're up to no good no matter what.
BBS Protection
This section deals with the two issues of secu rity for the hacker involved with
BBSs: hacker as -user, and hacker as sysop. These are actually inter-twined
issues, as sysops of one BBS will generally be users of other BBSs. You should take
these safety precautions on all BBSs you use and run, and should not hang around
systems which do not employ a high degree of hacker security.
Do not post messages concerning illegal activi-ties on any BBS where you don't feel
completely se-cure. This means it's bad practice to brag about your hacking
exploits in private e-mail as well as public message bases. If you are actively
involved with BBSing, by all means become good friends with non-deviant systems,
if only to maintain a balanced perspective of your computorial existence. But make
sure that what you say on those boards does not implicate you in any way with any
crime.
Don't get me wrong. I don't want to imply that posting messages about hacking on
a hacker BBS guarantees safety, because it doesn't, of course. When you start

sharing secrets on a hacker BBS, you'd better make sure the sysop takes all of the
following safety precautions: user screenings, a false front and hidden back boards,
double blind anonymity, encryption, and affidavits of intent.
The most important aspect of any hacker group, club, or BBS, is secrecy. A true
hacker BBS will not advertise, because it does not need new members. A hacker
BBS will seem to be a very homey, fam-ily-style BBS up front, but type a code word
from off the menu, enter a password or two, and you en-ter the hidden realm.
Hacker BBSs should further protect themselves by only allowing specified users to
enter the secret parts of its domain, to prevent unauthorized hackers or pseudo-
hackers from breaking in to your meeting place.
Any hacker BBS which does not take this mini-mal precaution of pretending to be
legitimate, is ju-venile, dangerous, and not something you want to be a part of.
Going up the scale of stupidity just a bit, I've seen plenty of "hacker" BBSs which
allow access to the hidden part by entering words like "DEATH" and, yes, even
"PASSWORD" as passwords. Need-less to say, the information found on such
boards is very low content, and usually consists of the vari-ous users calling each
other dickheads.
No new users should be allowed on a hacker BBS unless one or several existing
members can verify that the potential user is not a cop, will abide by the club's law
of conduct, has information to share, and will not be a big blabbermouth. As a sy-
sop, you will enjoy composing the list of rules that govern the way the BBS takes in
new members. Remember, any new member should not even know that the BBS
exists until the time when he or she is accepted into it. That will keep out law en-
forcement people, and keep in only the best hackers available.
Once a member has been verified as clean, his or her private information should be
destroyed from the computer records. In fact, think about the BBSs on which you
are a current member. Are there any which are likely to be busted in a raid? Even
if
151
you aren't doing anything wrong on the system even if nobody on the system is
doing anything illegal you know very well how mixed-up the feds get when it comes
to computers. You don't want your name brought into a computer crime trial, even
if the case is thrown out of court before it begins. So if you're a member of any
subculture BBS, tell the sysop, to replace your personal infor-mation (name,
address, phone number) with false-hoods.
If you ever register with a BBS but decide not to call back, make sure to inform the
sysop that you want your information deleted. (Verifying that such information has
been altered or deleted is one legitimate reason for hacking a BBS. Legitimate, that
is, from a hacker's ethical point of view.) It is important to do all this, because
there are impos-tors out there who are very good at catching hack-ers when they
least expect to be caught. In June of 1987, an AT&T security official logged onto a
Texas BBS and found messages from a hacker boasting about how he'd gotten into
a certain company's computer system. This led to the hacker's arrest.
Note that since the hacker undoubtedly used a handle on the BBS, and it was a
hacker board, the official might have hacked himself to get the hacker's real name.
In any case, make sure your real name, address and other identifying data never
stray to unsafe waters.
Before we start talking more about what you can do as the sysop of a hacker BBS,
let's conclude with a real life example of what happens when hackers DON'T follow
the advice I've listed above. In 1986 a BBS called simply and arrogantly, "The

Board," came into being in Detroit. The Board was run off an HP2000 computer,
and attracted hackers and crackers (and would-be hackers and wannabe crackers)
from all over. On August 20, the follow-ing ominous message appeared on The
Board when oneloggedin:
Welcome to MIKE WENDLAND'S I-TEAM
sting board!
(Computer Services Provided by BOARDSCAN)
66 Megabytes Strong
300/1200 baud - 24 hours.
Three (3) lines = no busy signals!
Rotary hunting on 313-XXX-XXXX
If you called up that day and read the newest messages posted, you would have
been surprised to find these little darlings staring you in the face:
Board: General Information & BBS's
Message: 41
Title: YOU'VE BEEN HAD!!!
To: ALL
From: HIGH TECH
Posted: 8/20/86 @ 12.08 hours
Greetings:
You are now on THE BOARD, a "sting" BBS operated by MIKE WENDLAND of the
WDIV-TV I-Team. The purpose? To demon-strate and document the extent of
criminal and potentially illegal hacking and telephone fraud activity by the so-called
"hacking community."
Thanks for your cooperation. In the past month and a half, we've received all sorts
of in-formation from you implicating many of you in credit card fraud, telephone
billing fraud, vandalism, and possible break-ins to govern-ment or public safety
computers. And the beauty of this is we have your posts, your E-Mail and - most
importantly - your REAL names and addresses.
What are we going to do with it? Stay timed to News 4. 1 plan a special series of
reports about our experiences with THE BOARD, which saw users check in from
coast-to-coast and Canada, users ranging in age from 12 to 48. For our regular
users, I have been known as High Tech, among other IDs. John Maxfield of
Boardscan served as our consultant and pro-vided the HP2000 that this "sting" ran
on. Through call forwarding and other conven-iences made possible by telephone
technology, the BBS operated remotely here in the Detroit area.
When will our reports be ready? In a few weeks. We now will be contacting many
of you directly, talking with law enforcement and se-curity agents from credit card
companies and the telephone services.
152

It should be a hell of a series. Thanks for your help. And don't bother trying any
harassment. Remember, we've got YOUR real names.
Mike Wendland
The I-team
WDIV, Detroit, MI.
Board: General Information & BBS's
Message: 42
Title: BOARDSCAN
To: ALL
From: THE REAPER
Posted: 8/20/86 @ 3.31 hours
This is John Maxfield of Boardscanl. Welcome! Please address all letter bombs to
Mike Wend-land at WDIV-TV Detroit. This board was his idea.
The Reaper (a.k.a. Cable Pair)
Is any comment required?
You can see from this that the people who come after hackers - the people who will
be coming af-ter YOU - are not all Keystone Cops. Maxfield knew enough to pick
'1001" handles like The Reaper and Cable Pair. The newuser password to get into
The Board was HEL-N555,Elite,3 - a quite hip password considering its origin.
Maxfield, and others like him, are as into hacking as we are. They are
knowledgeable of the culture and the lingo and the way we think. This last is
particularly hurtful, and it means you can't allow yourself to think like everyone
else. You won't become an elite hacker without the strength of your entire common
sense working for you. When you call up BBSs, be sure and exercise that strength.
Now let's talk about exercising First Amend-ment rights.
We do have the right to run our own BBS, and to exchange information on it. On a
hacker board, that information is likely not going to be the kind of thing you'd read
to your mother.
Disclaimers, such as, "This BBS will not tolerate any unlawful discussion of blah
blah blah..." are Boardscan is a company headed by John Maxfield, which seeks out
and destroys hackers and their ilk.
worthless, but you may want to throw them around anyway to complement my next
sugges-tion: Many of the traditional laws which hackers get nailed on have to do
with "harmful intent." That is, can it be shown that the hacker or cracker will-ingly
caused damage to a computer?
If you are running a hacker BBS or club, you might then consider having members
sign an affi-davit which makes their good intentions known. Members should sign
an agreement stating that they would never willfully damage another's com-puter
or its contents, that any information ex-changed on the BBS was for knowledge
value only and that none of the illegal activities discussed will be actively pursued,
etc. Basically this should be a way to let the members feel they are actively par-
ticipating in your code of ethical hacker conduct which should be prominently
displayed upon login to the BBS. Signing such a goody-two-shoes affi-davit may
not get you out of legal trouble, but it will do two things. It will stress the point
that a member who does not follow the agreement is un-worthy to be a part of your

hacker BBS or club. And to a jury, it will help convince them that you all are just a
bunch of innocent hobbyists being persecuted by the Big Bad System.
It has been suggested that sysops should have their members sign an agreement
that, in the event of a raid by law enforcement officials, users would join a lawsuit
against the officials to win back mo-nies to pay for destroyed equipment, lost time,
false arrests, the hassle, and everything else that goes along with being persecuted
by Big Brother.
Current e-mail should always be kept on-hand, so that you can use the terms of the
Electronic Communication Privacy Act to your favor. The ECPA ensures that
electronic mail that was sent within the past 180 days is private and requires a
warrant for an official to search and read it. Note that individual warrants are
required for each user who has e-mail stored on your BBS, thus increasing the
amount of paperwork required by The Law in going after you and your gang of
happy hackers.
So, if your users have signed an agreement, and sample e-mail is stored for each
user (it may be fudged e-mail whose time and date of origination gets automatically
updated every 180 days), you want to make all of this known to invading offi-cials.
Make a message such as the following avail-
153
able to all users when they log in for the first time, and every time they use the
system:
A SPECIAL MESSAGE TO ALL
LAW ENFORCEMENT AGENTS:
Some of the material on this computer system is being prepared for public
dissemination and is therefore "work product material" protected under The First
Amendment Privacy Protec-tion Act of 1980 (USC 42, Section 2000aa).
Violation of this statute by law enforcement agents is very likely to result in a civil
suit as provided under Section 2000aa-6. Each and every person who has such
"work product ma-terial" stored on this system is entitled to re-cover at least
minimum damages of $1000 plus all legal expenses. Agents in some states may
NOT be protected from personal civil liability if they violate this statute.
In addition, there is e-mail which has been in storage on this system for less than
180 days. Such stored electronic communications, as de-fined by the Electronic
Communication Pri-vacy Act (ECPA), are protected by the ECPA from unauthorized
accesses - such as seizure by government officials - without warrants specific to
each person's e-mail. Seizing the computer where this BBS resides would repre-
sent such an unauthorized access. There are civil actions which may be taken
against law enforcement agents under provisions of the Act. You can find them in
USC 18, Section 2707. On this system you can expect up to X people to have
stored e-mail. Each of them is entitled to collect a minimum of $1000 plus all legal
expenses for violations of Section 2700 and 2703. Note that all users of this
system have already agreed in writing that their pri-vacy is well worth the hassles
of court. We will sue YOU.
Perhaps the agency you work for might pay your legal fees and judgments against
you, but why take chances? If you feel the need to go af-ter our private and legally
protected e-mail, or take actions which would deny e-mail access to our users (such
as seizing our hardware), get appropriate warrants.

It is the policy of the sysop of this system to cooperate with law enforcement
agents -though we will not be involved in entrap-ments, and will not respond to idle
threats. Please bring it to my attention if you discover illegal activities on this
board, because as cura-tor of this museum I will not tolerate it.
"Hacking the hacker is the ultimate hack," John Maxfield has said. Maxfield is a
computer security consultant well known as a hacker tracker, and the one who
helped organize The Board sting de-scribed above. John scans BBSs looking for
hacker activity, and when he finds it, he informs the com-pany that is being hacked
about the problem. You know how insecure computers can be, and when you post
messages or send e-mail on a BBS you are in effect opening yourself up for the
world to see. Don't let some hacker tracker see something about you that you'd
rather keep private. When you roam around cyberspace, do so discreetly.
Other On-line Security Steps
In real life and detective fiction, the real enemies to a person's well being are
patterns in that person's life. Having a regular schedule of activity may make life
easier for you, but it also allows others to find you when you are trying to hide, and
notice you when you are trying to remain inconspicuous.
As an example, consider the case of the oilman who would ask the system manager
to mount tem-porary backup tapes every time he began a com-puting session. The
oilman would then read from the tapes posted by the system manager before
starting his work. The manager got suspicious fast: it was pretty evident that the
oilman was looking for data that others before him had backed-up onto those tapes.
That industrial spy, like many other hackers and crackers, was caught because he
followed a pattern.
Criminals (and hackers) like to formulate plans of action. But remember, any plan
you conceive should have elements of randomness to it. Don't allow yourself to
always call at a certain time, from
154
the same workstations or telephones, because one day you will arrive at your
favorite hacking loca-tion and find someone standing there with a pair of handcuffs.
Once I got a list of Social Security numbers from sitting in on a computer class on
the first day: the professor handed around a sign-up sheet for stu-dents to list their
name and number so that ac-counts could be made for them on the computer
system. I waited until the accounts were made, then I had to go in and try them
out. But trying them all at one time would have been too suspi-cious. Instead, I
tried a new one every few hours, a different name each time, so it would look as
though different people were trying it out.
The system was secure in that it asked me to change my password upon first login.
After doing so I was able to use the operating system's pass-word-changing
command to go back to the Social Security number so the original user could get in.
But in each user's directory I left behind a hidden program that I could use for
remote file viewing and playtime later on.
If you ever get into a situation where you can't change the password back to its
original form, try re-entering the password as some variation on the Social Security
number. For 123-45-6789 you might enter 123456789 or 123-45-6780 or 123-45-
67890, as if the typist's finger has slipped. If security precau-tions require a capital
letter or something, use one that is close to the last digit in the ID.

It is equally important that your modus operandi change as you move from one
hack to the next. As you know, once you're into a system you should do what you
can to create a new account for yourself. But make sure you always use a different
name and password, and make anything you input about your fictional persona as
noncommittal as possible. It is a minor point, but one of the things investiga-tors
noticed when tracking down computer cracker Kevin Mitnick was that the words he
used were often identifiable American vernacular, thus imply-ing that he was in fact
American (i.e., a spy from a Third World country probably wouldn't use the
password "RENANDSTIMPY").
Security Logs
It is easy to get manufacturers of security prod-ucts to mail you everything you
would ever want to know about the things they sell. Here I am con-cerned mostly
with software which quietly moni-tors the activity on a system, audits the system
re-sources for misuses and irregularities, and keeps a disk-based or printed log of
usage. Someone at the company takes a look at the log, then says to him-self,
"Hey! Mr. Poultry has been logging on every night at three in the morning. That
seems unusual... Better have a chat with him..." Suddenly you're in an unsafe
position, and you never even knew it was coming.
From your research into a particular computer you are looking to hack, you will
know which se-curity products are in force (by calling system op-erators feigning
that you are a computer consult-ant, or by looking through the company's library of
reference manuals). Get the descriptive literature from the manufacturer so you'll
know what silent enemy you are up against.
Security logs - if they are in place and actually attended to - will alert
administrators to any pat-terns which you create. Well, you're not going to create
any patterns, but you're probably going to create some problems, and those too,
will show up on the security log's report.
If you plan to stay on a given computer for any length of time, for instance if you
plan to use that computer as a springboard from which to jump around through the
network, you must discover the security auditor and render it useless.
Don't destroy the auditor, simply reprogram it to ignore you when you log on. Or
find out how it keeps a record of events and see what can be done to eliminate your
own tell-tale traces. This should be piece of cake, considering that if you're in the
position to do these sorts of things, you most likely already have root access.
If you have been logging on in a similar way for a while, you might want to change
previous log en-tries to reflect a more random login schedule. You may also be able
to use a date or time setting corn-
155
mand to control how the security monitor judges your behavior.
WARNING!
••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
There have been many, many instances of hackers carefully editing out personal
sections of audit records, only to find to their horror that they've deleted more than
they should have. Or hackers who were trying to be helpful by cleaning up a messy
program or fixing a typo in a memo, and having some disaster occur. You know
you should always keep backups. The backup rule applies every time you use a

computer, especially computers which aren't yours. If you feel you must alter a file
that doesn't belong to you, alter a backup of that file. When you're done, make
certain your changes are perfect, delete the original file and then rename the
backup.
One simple task that most auditors and many secure operating systems will
perform is the re-cording of unsuccessful login attempts. Again, re-search is
needed to see how your particular target computer responds to inaccurate logon
inputs. Some programs will let you try three or four user-name password
combinations before resetting and saving the last attempt. In that case you would
try to always make your last login attempt something innocuous. Or to be safer,
don't type anything for your last allowed login attempt. Instead, press Con-trol-C
or Control-Z or whatever it is you can use to break back to the previous level of
interaction.
Auditing programs can be a nuisance if you're running a big job, such as a brute
force password generator. If you're able, try to write these pro-grams so that they
get around the security logs. Going directly to the hardware may be one solution to
this problem. Another, depending on what kinds of things the log is keeping track
of, would be to rename suspicious commands, so that the log either won't know to
record those commands under their new name, or if the supervisor reads through
the log printouts, he or she won't notice any question-able activity going on.
Printed logs are a big problem. Any hacker worth his salt, can go in and fiddle with
records which have been stored on a tape or disk. But what if the security monitor
makes a real-time printout of events as they occur? Then, my friend, you are
stuck. Once a deed is done, it is trapped on that page for life.
The thing to do is catch any mistakes before you make them. Limit the number of
illegal or questionable activities you perform until you can find a way to disable the
printer. You may be able to use software switches to program the printer to print
everything in a nonexistent font, or if it's a multi-color printer, in a color that has
no ink car-tridge or ribbon. Of course, since you're probably doing all this over the
phone, you might not know what equipment is being used. However, it might be
possible to reroute print jobs to an electronic storage medium, or to an unused
port; that is, tell the computer to print stuff out on a printer that doesn't exist. At
times it may even be possible to trick the computer into thinking it's printing to the
printer when actually it's printing back through its own modem - and so you end up
receiving re-Ports of your own activities as you go about your business.
A more troublesome form of paper log is some-times used by organizations to keep
track of who does what, when, and why. Some companies insist that each
employee enter telephone calls in a log. A monthly review and a comparison of the
log with phone bills is done - and if anything doesn't match up, well, you can figure
out what happens next. If you sneak into an office to make long dis-tance calls,
you can be easily trapped with such a log, since you probably won't know about it.
Even if you're dialing in from home (or a phone booth), a log can trip you up. If
you use a company's corn-puters to call other computers, that might be a toll call
which would show up on the phone bill, but not in the employee log.
Companies may keep logs to verify employee comings and goings, and use of
equipment. Stay on top of things because the littlest errors lead to the biggest
downfalls.
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In Public And On-Site

Doing any sort of hacking-related function in public or on-site - altering public
access comput-ers (PACs) or public access terminals (PATs), sabo-taging for reverse
social engineering (RSE), doing in-person social engineering (SE), using a
university's computing facilities, or simply doing research at a library - is riskier
than doing the same sorts of things at home. Not only do you have all the threats
that a home-based hacker has, you have the additional concerns of whether or not
you will be recognized or apprehended.
Use proven burglar's techniques when selecting spot to do public hacking. When a
burglar enters a house, the first thing he does is scope out all the exits. Don't sit
down at a computer from where you won't be able to escape easily in more than
one di-rection. And just as a burglar is always glad to see tall shrubbery to hide
behind, you should try to sit at computers that are hidden in some way; with people
or objects sitting in front of you, and hope-fully a wall behind you, so no one can
look over your shoulder.
Always be ready to leave a public hack at a moment's notice, and never get so
involved with your work that you forget where you are. Remem-ber, that's what
happens to regular users when shoulder surfing takes place - they forget where
they are and they let people see the secret things they're doing. A hacker must
always be more secu-rity-aware than a regular user.
Take care to have a decent story prepared if youre trespassing, or if your actions
will seem fishy to a passer-by. Make sure you dress the part of your story.
Regardless of your story, clean dressy clothes are always a plus.
Finally, one should always keep in mind that a computer room is very likely
occupied by at least one hacker or cracker at any given moment. Be alert to
shoulder surfers, and to other tricks of the trade. When I sit down at a public
terminal I always press the Break key a few times, and log off several times before
logging in - just in case someone has set up a simulation trap.
Be cautious, too, upon log out. Some terminals, such as the Tektronix 4207 and
others, maintain a buffer of the screen display. Often that buffer is not cleated,
even after log out. What that means is, some unsuspecting soul walks away from
the ter-minal, but leaves behind a record of every action taken during his or her
session. Anyone can go over to that terminal now and access, read, even print out
dozens or hundreds of screenfuls of data.
While Off-Line: Minimizing Losses
Okay, so what if all of this doesn't help you? What if you still get caught? It's good
to be pre-pared for such an emergency so if the feds do catch up to you they at
least won't have any evidence on which to base a trial.
Maintaining Your Computer
You should routinely look at the files stored on your computer and destroy those
which you ille-gally acquired. When I say "destroy" I mean it -don't just delete
those files: overwrite them with a single repeated character, encrypt them with the
lengthiest, twistiest key you can fathom, and only then erase those files. You can
use a "Wipefile" or "Wipedisk" program to write over data. That way you won't
have compu-cops poking around in your secrets.
Also keep in mind that sometimes pieces of files get lost or unattached from the
files to which they belong, or parts of files get duplicated elsewhere on your disks.
It's a good idea to regularly check for these orphan text strings and eradicate them
if they contain incriminating evidence.

Any computer file which you simply can't de-stroy must be encrypted and, ideally,
hidden under an inconspicuous filename, such as PACMAN.EXE.
There are other matters to consider, other things about your computer that might
not directly con-vict you, but can lead to evidence that will: termi-nal programs,
autodialers, databases of modem numbers and account codes, lists of BBS numbers
(especially pirate, phreak or hacking boards), and any other program that could
even remotely be linked with a crime.
To play it safe, I use physical locks on my com-puters along with software "locks." I
programmed all my computers to check for a particular key be-ing pressed during
the start up procedures. If the computer goes through its entire start up mode
without detecting that key, it knows that some-
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thing's wrong. It will then call a time-and-date sub-routine. The routine shows the
correct time and date, and gives me the opportunity to correct them. I must input
a certain time and date, otherwise the computer will display a "LOADING MENU"
mes-sage and remove the directory in which I keep all my naughty stuff. There is
an opening menu too, which one can not enter or exit without inputting the proper
password.
Luckily, I've never had my computers seized. If I ever do, I pity the untrained
lummox who gets to go through my stuff; my systems are all booby trapped to
destroy incriminating evidence. And even if he's prepared for that, he still won't
know how to prevent it from happening!
Keeping Your Other Stuff
Once a law enforcement official has a warrant for your arrest, he or she can legally
steal all of your computers and peripherals, blank disks and audio cassettes,
commercial software and documentation, printouts and operating logs, telephones
and an-swering machines, any piece of electronic equip-ment as well as any papers
indicating that you are the owner or user of that equipment, wires and loose parts,
model rockets, disk boxes, radios, sol-dering irons, surge protectors, books,
journals, magazines, et cetera. These things I've listed are all things that have
been seized in past raids. Also, if the crimes which you are suspected of
committing are related to a specific place or person, they will seize any papers or
evidence with which a connec-tion may be made between that place or person and
the crime. They purposely write their warrants to allow seizure of a wide range of
items, and believe me - they will take all of it.
And don't expect to get any of it back in one piece, either. This is yet another
reason why, as I said in the beginning, it may not be such a great idea for hackers
to even own a computer. It's sad but true, and so you should do your best to hide
anything when you're out of your house or not us-ing your equipment. If you have
printouts or notes lying around, keep them in folders marked "SCHOOL
HOMEWORK" or "CHURCH GROUP". Make the marks big and visible, and innocuous,
and maybe they'll overlook the folders' contents.
it is a myth commonly heard that computer printouts can not be used as evidence
in court, since they are so easily forged. The truth is, a print-out is just as valid as
any other piece of written evi-dence, as long as it can be shown to have been made
at or near the time of the criminal act, or during preparation for the act. If a Secret
Service thug, after taking your computer, makes a printout of a file contained on it,
then that printout is invalid evidence, since he made it and not you. On the other

hand, if there is in fact some accessible in-criminating evidence stored on your
computer, the prosecuting attorneys will know how they can le-gally present it to
the court (I presume by bringing your computer into the courtroom, plugging it in
and firing away). On the other hand, the feds are so good at smashing up seized
computer equipment that you probably have nothing to worry about!
It is important that when you hide stuff, you make it look as if the stuff has no
connection with computers or electronics. Law enforcement officers are smart
enough to get warrants that let them take anything even remotely connected to
electricity. Let's look at a hypothetical example. Suppose un-derground
information were routinely distributed on audio cassettes. Naturally we would
resort to putting that information on store-bought tapes with legitimate names -
Beatles, Grateful Dead, whatever. The cops would know that, and thus would want
to get their hands on every tape we own, including ones that look as harmless as
rock and roll.
As hackers, we do exchange information and keep records on disk. So if you have a
box of disks containing all your hacker stuff, you can't simply label the disks with
names like "Space War" and Pac Man." They will suspect either that the disks have
been labeled misleadingly, or that the games themselves are real. (Think of Steve
Jackson.) Be-sides, in their raid they won't stop to sort seemingly irrelevant
belongings from the obviously illegal ones. So you'll have to hide the disks
themselves, and hide them in a way that is unrelated to tech-nology. The same
goes for your other electronics equipment, and anything else that might reason-
ably be stolen by the feds. For example, I keep my backup disks in a graham
cracker box. Am I being paranoid? I don't think so. I store my laptop in a big corn
flakes box up in the closet - it's just as
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easy to keep it there as anywhere else, and doing so makes me feel more secure.
You already know how companies leave help-ful information in their garbage bins,
but you should realize that your garbage is just as helpful to someone investigating
you for computer crime. Anything incriminating you want to discard should be
destroyed beyond recoverability first, and discarded from somewhere other than
your home. When I say "destroyed" I don't mean putting it through a shredder - I
mean completely de-stroyed. If the Secret Service finds shredded paper in your
trash, they WILL piece it back together.
Paper printouts should be soaked in water to wash away the lettering, and then
shredded. Disk contents should be encrypted, then deleted. Disks should then be
zapped with a strong magnet (bulk erasers, called degaussers, are available to do
just that) and the disks themselves chopped up.<This behavior is not paranoid
enough for the US Department of Defense, which according to Lance Hoffman in his
Modern Methods for Computer Security and Privacy (Prentice-Hall, Inc., Englewood
Cliffs, NJ: 1977) "feels that there are techniques for electronically retrieving
overwritten information and thus requires destruction of the recording
medium.">These items can be anonymously deposited in some public garbage can,
or in the case of paper, a public re-cycling bin. I'm serious! You do this and you've
just blown away any "theft of trade secrets" indictments they wanted to hang on
you!
Conclusion:
How To Get Caught

This is a book of methods after all, and so here is a list of methods NOT to follow.
If you do these things, you will definitely get in trouble. Because, you see, there
are five ways you, the hacker, can get caught hacking:
1. by traces or technical means,
2. by being finked on,
3. by getting many agencies ganged up against you,
4. by making a mistake, or
5. by being made (recognized).
You will get caught by phone line traces and
other technical means, such as audit logs. So don't keep a routine. Switch the
phones and computers you call from all the time.
You will get caught by getting ratted on. Main-tain contacts with other hackers, but
do so dis-creetly. Don't tell anyone who doesn't need to know about what you're up
to. Above all, be nice to the people you come into contact with while shar-ing
hacking tales, doing research, or while perform-ing the hacking itself. Be nice to
them, and hope-fully they will be nice to you.
You will get caught by getting many agencies ganged up against you. Don't steal or
destroy or vandalize. These things make you look bad, and downgrade hacking in
the eyes of those investigat-ing it. Hackers have a bad enough image as it is,
mainly because hacking's most public practitioners are nerdish eighth grade heavy
metal pseudo-anarchists with skin problems. If you re-main true to hacking ethics,
you will fare better than if you demolish what you hack - because fewer agencies
will be willing to pursue you. Tiptoe.
You will get caught by making a mistake. It is a mistake not to take all of these
precautions. Always think before you act. Never reveal anything about yourself.
Remember to delete backup files. One of the things that tripped up Lt. Col. Oliver
North -according to Donn B. Parker in his Computer Crime: Criminal justice
Resource Manual - was that he: did not understand that using the ERASE command
in the White House Executive E-mail system merely removed the name and storage
address of an E-mail message from the directory of messages; it did not destroy the
contents of the message. In addition, frequent backup copies of all messages were
made and stored for later retrieval in the event of a com-puter failure. As a result,
much of his corre-spondence was retrieved as evidence of possi-ble wrongdoing.
You need to be especially vigilant about timed backups which are made
automatically, without your consent.
If you're careful, you will make few mistakes. But the most careful hacker can be
tripped up by the mistake of assuming a course of action is infal-lible when there
are, in fact, gaping holes in it. For example, in 1974 a criminal in Tokyo tried to
use
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one of the fundamental properties of electronic transmission of data in his favor -
the delay that comes about from data being shuffled through ca-bles or telephone
lines.
The criminal opened a bank account using the false name S. Kobayashi, then
proceeded to with-draw small amounts of cash from automatic teller machines
(ATMs) scattered around Japan. Each time, after he withdrew some money, he
would telephone the bank to find out the status of his ac-count. By doing so,
Kobayashi found that it took twenty minutes for the bank's central computer to
register a withdrawal from a remote cash-dis-pensing machine.

Later, Kobayashi used this information after carrying out a kidnapping. He
demanded a ransom of 5 million yen to be paid into his account, figur-ing he would
have twenty minutes of getaway time while bank officials waited for the main
computer to receive the information regarding from which dispenser the sum had
been withdrawn. The plan backfired because of this one assumption. What
Kobayashi didn't realize was that programmers at the bank were able to reprogram
the central com-puter to immediately identify which machine the criminal was
using. Police were stationed close by to each of the bank's 348 ATMs, and when the
kid-napper retrieved the money, he was caught.
Look out for the unexpected twists in your plans, and remember that there probably
are peo-ple on the other side trying to find ways to foil you.
Finally, you will get caught by being recog-nized. In public places, make sure you
stay unob-trusive.
The surest way to NOT get caught is to NOT start hacking. But then, the surest
way not to die is to live an inactive life. Part of your life is computers and the
things you can do with computers. Without hacking, all you have to do with
computers is busi-ness stuff or school stuff, a little game playing, and possibly
some programming.
But WITH hacking, you have instantaneous control of the world. Enough said. May
we all have a good many peaceful, happy hacks!
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Chapter 15:
Conclusion
The Hacker's Ethic
Many hackers and non-hackers have given their versions of the "Hacker's Ethic."
The versions are all pretty much the same. What's different is the de-gree to which
the ethic is followed. Smart people, like many hackers, start out by following the
rules, the moral codes - the Ethic - but then they get sidetracked. They begin to
get the feeling that be-cause they know about the law, they have the authority to
break it: "It's not like we're blindly acting without discretion." That's what smart
peo-ple do - because they know they're smart, and be-cause of it, they forget that
even smart people, even smart hackers, are often very, very dumb.
What I'm about to do is give my own version of the Hacker's Ethic. This is a set of
beliefs that I have about the world of computers. It may not be what you believe,
but that's all right. Hacking has to do with independence.
However, I urge you to understand why it's important that you formulate a hacker's
code of ethics and live by them. Having a code of ethics will help keep you out of
trouble. Now, I'm not saying that if you're caught, a judge and jury are going to
base their verdict on whether or not you behaved according to your beliefs -
especially since some of your beliefs likely involve illegal activities.
What I'm saying is, I like to think that if you have formulated a moral code, and it
is well known that you abide by that code, and if all members of your hacker's circle
sign affidavits testifying to their loyalty to the code, then in some instances it may
allow a judge or jury to honestly say to themselves, "Gee, he meant no harm by it -
the damage was not intentional." If you remember our previous dis-cussions of law,
many offenses require that, for a criminal action to have occurred, the suspect's
con-duct must have been intentionally criminal. Well, I would like to think that's

the way it would turn out. In real life one can't count on others seeing things from
your point of view.
At the very least, one would hope that by providing a code of ethics, you could
more easily weed out undesirables from your group, and keep your members safe
and happy. More importantly, I feel there is some indescribable underlying
goodness
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about having a code to guide you. If I sound preachy, fine. I'm done.
This is my Hacker's Ethic. These are my beliefs about computers and hacking, as I
attempt to live them.
My Code Of Ethics
Computers have enabled a great deal of infor-mation to be available to anyone, and
quicker and cheaper than ever before. The free flow of informa-tion is good, but
not when it violates human rights. There are two kinds of human rights. There are
rights which pertain to individual humans, and rights which pertain to humanity as
a group.
All of humanity should have the ability to ac-cess virtually any known information.
There should be a free flow of information, and informa-tion and technology should
be used in moral ways. People should know how things work, if they choose to
know, and such information should not be kept from them. New ideas should be
heard, and there should be the capability for ideas to be discussed, and questions
answered, from multiple viewpoints. People should be made aware that all this
knowledge exists, and can be brought to them. Technology should be used to this
end, not for profiteering or political gain.
Individually, people should have the right not to have data pertaining to them
available for use in ways which are adverse to them. People should have the right
to be notified when information about them is added to a database, when and to
whom it is sold or given. Because it is their own personal information, individuals
should have the right to control how information about them is dis-tributed.
A person should have the right to examine in-formation about him or herself in a
computer file or database, and should be able to do so easily. The person should
have the right to easily correct inac-curacies in that data, and to remove
information that is offensive to that person. People should be guaranteed that all
makers and suppliers of data-bases will enable these rights to be granted, in a
timely fashion.
All of this is what should be the case, and in some situations these rights are
currently acknowl-edged. However, most of these rights are almost unanimously
ignored. Therefore it is necessary to hack. Hacking is using computers (or
whatever) to live according to these ideals. Hackers have these ideals about
individuals in general and humanity in general, and I have a set of ideals which I
personally follow so that the general ideals may be carried out:
• Never harm, alter or damage any computer, software, system, or person in any
way.
• If damage has been done, do what is necessary to correct that damage, and to
prevent it from occurring in
the future.
• Do not let yourself or others profit unfairly from a hack.
• Warm computer managers about lapses in their security.

• Teach when you are asked to teach, share when you have knowledge to spread.
This isn't neces-sary, it is
politeness.
• Be aware of your potential vulnerability in all computing environments, including
the secret ones you will
enter as a hacker. Act discreetly.
• Persevere but don't be stupid and don't take greedy risks.
I am not suggesting that following a code of ethical conduct of this sort makes my
hacking moral or right. But I'm also not saying that my hacking is immoral. Don't
even raise any argu-ments along those lines with me because I simply do not care
about them. We know what's legal and what- isn't. Hacking is something that I am
going to do regardless of how I feel about its morality. It is pointless to raise the
issue of "Do you honestly think you can justify snooping with your loopy code of
ethics?" because if you must consider that issue, you must not have hacking in your
blood.
Combining Principles
Throughout this book I've tried to offer general guidelines on the various topics that
will prepare you for any computing situation you happen to find yourself in. When
it comes to so broad an undertaking as "hacking," there can obviously be no one
specific set of steps to follow to achieve one's objectives. Rather, one must call
upon a vari-ety of general ideas, overlay them when appropri-ate, and just hack
away until something comes of it.
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From knowing what to expect you should know how to react to a new challenge -
and your ability to hack will improve.
I want to tell you one final story. This is a story which demonstrates many of the
principles you have learned from this book: research, scavenging, shoulder surfing,
persistence and logical reasoning, programming methods, brute force, general com-
puting knowledge, social engineering, reverse so-cial engineering, screen analysis,
system simula-tors. It shows how each is played off the other for the final
triumphant result of a successful hack.
My One-Person Tiger Team
Recently I was given the opportunity to try my hand at hacking into a newly set up
computer sys-tem at a special library. The library director was concerned because
they had recently transferred to this new system which, unlike previous ones, al-
lowed dial-up access from outside lines. The direc-tor wanted to know if it was
possible to break out of the search facility, into the restricted areas hav-ing to do
with overdue fines, patron names and addresses. Or would it be possible to escape
en-tirely from the library program to the operating system and perhaps do some
damage?
I told him I would be happy to look into the matter.
Now, he offered to give me one of the dial-in numbers, but I told him there was no
need for that. I was a hacker after all! (Actually, I was acting cocky to impress him
- I already knew the phone number from watching him give me a demonstra-tion of
how the public part of the system worked.)

I called up the system from my home and ex-plored every inch of it. It was a
command-run sys-tem. The opening screen allowed one to select a function by
entering commands such as CAT to search the library catalog, or HOL to place a
hold on an item. The proper way to end a session was with the END command. I
tried other, unlisted commands to see if any would work. More than you n-ught
realize, this is a very common practice on computer setups where part of the
system is public and part is private. Almost always the pub-lic part of the system
will have at least one secret command to allow entry into the private side. So I
tested a whole slew of key words: EXIT, BYE,LATER, START, LEAVE, LOGIN, QUIT,
USER, PASS, LOG, LOGI, CIRC, and the like. Some of these I have seen used in
actual applications. (For example, CIRC is often used to enter the part of a li-brary
program that takes care of circulating mate-rials. I discovered LEAVE on a
computer that was situated in a museum - typing it in allowed one to exit the menu
arrd enter a special area for museum curators and employees.) None of these, nor
any of the other words I tried, worked.
Since it was a brand spanking new system, I was sure there would be lots of bugs
hanging around that I could exploit. Indeed, when I spoke to the director, he
bemoaned the fact that certain function keys on the terminals had not been set up
yet, and that pressing them would exit one to an incomprehensible programmer's
environment. Aha! This is what I needed! But when you're calling in over the
phone lines, you don't have access to the function keys that are available on the
computers in the company offices.
I thought perhaps the function keys were mac-ros for commands which a user
would otherwise have to type in by hand, but I didn't know what those commands
were. I was doing nightly excavatings of the building's garbage bins to see if
anything would turn up, and finally something did - a badly mangled reference card
from the com-pany which had supplied the software package. I painstakingly
searched every last inch of the trash that night, but could only come up with half of
the card.
At home, I saw that among the things listed on the card were indeed the names of
commands mapped to the function keys. Only two of them were legible, and the
rest were either torn off or smeared beyond readability, but those two turned out to
be enough.
What was immediately apparent was that I had made a wrong assumption - not ALL
the com-mands were standard English words or abbrevia-tions of words, like CAT or
END. There were two-letter commands and dot commands, too.
When you input a dot command you type a period (.) followed by an alphanumeric
command. They are often used in applications where entering the alphanumeric
command by itself would be misinterpreted as inputted data. For example, let's say
you're using this library system, and at the prompt where it asks for an author to
search for,
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you decide to search for books by title instead. So you type the TITLE command.
What's going to happen? The computer thinks that "Title" is the name of the author
you want, and starts a search for someone with that name. To get around that sort
of problem, this system allows a period to be typed before a command. Now if you
type ".TITLE" at the author prompt, the system sees the leading period and
recognizes that what follows should be treated as a command.
Programs often use a period before the com-mand because a period is a small,
undistracting character and is also very easy to type. But occasionally you will run

into "dot" commands which use other characters, most notably, slashses (/ or or an
apostrophe (').
Anyway, the reference card told me that press-ing function key F1 was akin to the
QUIT com-mand, and F2 was the HELP command. Both seemed promising -.QUIT
because it might allow me access to the nether regions, and HELP because since
this was a newly set up system, help was very likely not yet implemented - and
might be one of those functions which the director was complain-mg would crash
the system if someone used it.
I was dialing in to the computer from the out-side world, and there really isn't any
way to transmit a function key press through a modem (function keys are not in the
ASCII lineup), so I had to hope that either QUIT or HELP would work. Of course I
had tried their undotted counterparts be-fore to no avail, but maybe, just maybe,
one of them with the dot would work....
Nope!
.QUIT simply terminated my session and dis-connected me. When I typed HELP,
the screen cleared, and the following line was printed:
<EOF txthlphelp000>
I presumed this meant that the End Of File helpOOO in the txthlp directory had
been reached; in other words, the file existed but was blank.
I was temporarily licked, I thought, though it was interesting that now I knew about
a txt direc-tory which apparently contained various text files, and a hIp directory
within it which held help files. Something else I noticed: every time the screen was
redrawn, a line at the top was displayed which read something like this:
<<< J. Smith Co Special Library On-Line >>>
(000)U/SYS v55.6
The three digits in parentheses changed de-pending on which part of the program I
was using. "(000)" presumably signified the opening screen, where I was
attempting to launch these unlisted commands. If I tried the HELP command at,
let's say, screen number (013), 1 figured the system should then search for the file
`txth1phe1p013.` Indeed, that is exactly what happened.
Now, every program has its own style of input and output. One of the things this
system used to take input was a cornmand followed by a number. For example, if a
search turned up fifty books, you might type "BR12" to see a brief citation for book
number 12. 1 wondered if the same format would apply to the help command as
well. I tried ".HELP99999," hoping that 99999 would be a num-ber too big for the
system to handle (certainly there was no screen that high). What happened was I
got a message informing me that the command was not valid. I tried other
variations, such as ".HELP 99999" and ".HELP < 99999" but none of them were
valid either. Finally I gave ".HELP99999" one last try and this time it worked! I
guess I had made a typo when I tried it the first time, perhaps inserting a space
between the "P" and the "9," or whatever. The system crashed, and I found myself
launched into the programmer's debugging environment.
It was like a mini-editing system for the text and batch files that the database
used. I fooled around a bit with it and came up with nothing much of value except
for a copyright notice that gave the initials of the company that made the program.
I looked through various directories of soft-ware companies, trying to come up with
actual words to go with the initials, and finally I found two that fit. I called up the
first and found out that they were the ones who had written the program I was
interested in. I asked about obtaining replace-ment documentation for the
package. They said sure - all I had to do was supply the serial number that came
with my software and they would send me the book for a nominal fee. I tried some
bull-shitting: "Well, I don't know the serial number be-cause I don't have the

instructions." No good; the receptionist informed me that the serial number could
be found on a label stuck to the original disks. "I don't have the disks near me
right now -I'm calling from my car phone. I'm sure I sent in my registration card,
perhaps you could check that? My name is Jonathan Smith from J. Smith Co..." I
164
prayed that the real J. Smith had sent in his card. He had not. I thanked the
receptionist and told her I would call back the next day.
I figured the company library must have the documentation, but I couldn't just
show up there and ask the director if I could peruse it for a while. Besides, I
wanted to do this whole thing as if I were an outside hacker, unconnected with the
company, trying to get in; special favors were out of the ques-tion.
That meant it was time for some serious social engineering. The only person at the
library who really knew anything important about the system was the director
himself, and he was out of the question since he would recognize my voice. Any-
way, all I needed was this serial number. I called up the library reierence desk, and
made up a story about how I was a programmer from the company that had
installed the new computer system and I was wondering if they had version 8 of the
pro-gram? Naturally she didn't know, but I kindly ex-plained to her that to find out
she would have to look for some disks with labels stuck to the front of them....
She found the disks in the director's office, and told me that the number eight
wasn't printed any-where, just one long serial number. I had her read it to me, and
one of the twelve digits was an eight, so I told her yes, everything was fine, that I
just wanted to make sure she had the newest version, and that I would send her
version nine if we ever got around to releasing it. She couldn't have cared less.
Anyway, I paid extra for overnight delivery of the debugger documentation, and got
it late the next day. Poring through it I found out how to move around in the
programming environment and - more importantly for my purposes - to exit from it.
(All the important commands were ab-struse things like KLOO and EE61. This
editor was clearly a rush job, created by programmers, for pro-grammers.) Exiting
the debugger got me to a login prompt. I quickly found that typing in "circ" at this
prompt, and "JSC" at the following password prompt, would bring me one step
closer inside. (Here JSC stands for J. Smith Co. Of course that is a fictitious name.)
After entering the password correctly I was brought to a second level of security -
apparently the circ/JSC was a general login combination thatanyone with legitimate
access to the system knew. I know how to put in "your personal 9-digit ID code."
Okay, well we know what nine digits means - a social security number!
I knew that the director had been born and raised in Kentucky, so I knew the first
three digits of his social security number. I wrote up a program to continuously spit
out possibilities for the last six digits, and it wasn't too long before I found one that
worked. When it did, I was greeted with, "Good evening Jane Thombuckle! Please
enter your personal password." Jane Thombuckle was not the library director. Now
I needed Jane's password. I went back to brute forcing for a while, looking for
Thombuckle's personal password by trying out the obvious possibilities, until I got
sick of it.
I didn't know who Jane Thornbuckle was, but one of the things I had pulled from
the garbage was a stack of discarded company newsletters. Buried deep in the
stack was the answer: Thornbuckle was a figure in the company's Management
Information Services Department (i.e., a computer program-mer). I did some more
hacking away at her pass-word, but that was fruitless. Finally I restarted my
program to try social security numbers, and even-tually came up with the library

director's. Hacking his password by chance was, like Thornbuckle's, getting me
nowhere.
I decided to look back at what I already knew. The programmer's environment was
an interesting thing, and I played around with it awhile until I had learned enough
about it to use it to edit files to my liking, as well as a few other tricks. I was able
to use one of the debugger's find commands to lo-cate every occurrence of the
word "circ" in the sys-tem files. One of these files contained a bunch of gibberish,
the word "minicirc," some more gibber-ish, and then "cirOt followed by more
gibberish. I tried analyzing the gibberish after the second circ to see if it could be
unencrypted to read "JSC." If it could, then I would be able to use the same proce-
dure on the gibberish following "minicirc." This tactic was to no avail.
Back I went back to that initial login prompt and tried typing "minicirc" with various
pass-words. The problem was I didn't know what the "mini" part meant. My best
guess was that it was some sort of small version of the actual library sys-tem - a
simulator or training module. I was trying passwords like TRAIN, MINI, MCIRC,
MINICIRC,
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TUTOR, LEARN, and after a lot of trouble, finally came up with T.CIRC1. This got me
to my favorite little message: "Please enter your personal 9-digit ID code."
Within a few seconds I had discovered that the number "555555555" worked like a
charm on this mini circulation system. The screen cleared.
"Good morning New User!" my glowing com-puter screen exclaimed - it must have
been three or four in the morning. "Please enter your personal password."
This was, I hoped, the last level of security. Yes it was: a few moments later I was
in the minicirc under the password "TRAIN."
I was proud of myself. I had managed to get out of the public side of the dialup
system and into the behind-the-scenes area. But my journey was not over yet,
because I still had not gotten into the ac-tual circulation system - just the
simulated one used for training purposes.
The minicirc was helpful, but it lacked certain features which, if I were an industrial
spy, I would have liked to have had access to. I could use minicirc to check out
books to patrons, register new patrons, search the databases, etc., but the
database contained only imaginary names and addresses. Many of the other
features of the system were unimplemented, but just knowledge of their presence
helped me. There was a bulletin board service, which would display messages after
log-ging in. A few standard messages had been left by the installers: "Hi, welcome
to the system...... From examining these messages carefully, I came up with some
important tidbits of information.
Each message began by listing who had sent the message, and who could receive
it. Part of the sender data included the word "minicirc," which implied that it was
possible to send messages from the minicirc to the circ and vice versa (otherwise,
why would they bother putting that in there?). The second important fact was that
although messages were apparently sent by default to all users, one could specify a
particular user who would be the only one to read a posted message.
I used the editor to write a letter and send it to myself. Then I logged off, called
back and broke out to the programming environment as I had been doing. Pushing
the debugger to its limits, I was able to use its file editors to find the letter I had
written, and alter its contents. Instead of being directed to me on the minicirc, I
changed it to be sent to the library director. And where originally the file had
stored my own name - "New User" - I altered it to say that it came from some

fictitious rep-resentative from the database company that had written the software.
The bulletin instructed the di-rector to call this person about some new im-
provements that could be gotten for free now that version nine had been released
(reverse engineer-ing!). I supplied a phone number to call. The num-ber I gave
him was that of a friend of mine, a fellow hacker named Morriskat, whom I had
thoroughly briefed on how to act when the library director called. We set up
Morriskat's answering machine so that if the director called when he wasn't there, a
convincing song-and-dance would tell about the new products this company was
offering at the time.
When the director did make the call, Morriskat talked about some upcoming
features, then asked him some technical questions about the particular way the
software had been installed for his library. The director didn't know the answers
but, he said, he had a terminal right in front of him - he could log on...
"Perfect," Morriskat said. "Just go through your usual stuff. Circ. JSC. Uhm,
Social Security Number 402-66-0123. Are you still using the personal pass-word
we originally set you up with?"
"Yeah, 'Firebird.'Okay I'm in......
Knowing three out of the four security controls, projecting an air of omniscience,
and having the spoofed e-mail as support, getting that final pass-word was easy as
pie.
For the last phase of the project, Morriskat and I sat down to see what we could do
with the library director's system access. It turns out we could do plenty. We
made up new superlevel accounts for ourselves. We were able to toggle access to
virtually every aspect of the software to any other user. And we could print out
personal information about every employee at the company - because every
employee, whether they ever stepped into the company library or not, had a record
in the li-brary's computer. We knew what materials they had borrowed, their home
and office phone num-bers and addresses, and year of birth.
Exiting from this level to the network server was simple to do, and from there we
could login to
166
one of the host computers using the library direc-tor's name and his password
"firebird."
As the coup de grace, and to prove conclusively that I had done what I had set out
to do, I used the programmer's interactive debugger editor to alter the library
program's opening screen so that in-stead of giving an explanation of commands, it
told a dirty joke. Then I left a file inside the library di-rector's directory which
explained how I had bro-ken in. This story as I've told it here is pretty much that
file, although here I've expanded more on the hackerish side of things.
Principles Combined
If you are to be a truly successful hacker, one who can hack on demand like this,
then you must be a hack-of-all-trades.
It's not enough to be a spontaneous and smooth-talking social engineer. It's not
enough to be a programming genius. It's not enough to have the perseverance of a
marathon runner. You must have all of it and an imaginative, goal-oriented
mindset as well. And the ethic. I truly believe that a hacker who lacks the hacker's
ethic will be going nowhere fast, because if you don't show an honesty and

compassion in what you do, others will not act kindly toward you and that quickly
leads to trouble.
Did I display the hacker's ethic when I carried out the hack I've just described?
Yeah - I had done nothing more than rename the file that contained the system's
opening screen, and put the dirty joke in a new file with the old name. And I
showed the library director how to go about switching them back. Later the two of
us, along with members of the computing staff of the company held a meeting to
discuss what actions would be taken to close up the security holes I had found.
And, I should add, they have done so.
Concluding Thoughts
Ask any enlightened sage about the purpose for the existence of our universe - or
ask any burning, age-old philosophic question of the kind - and the response will
invariably be something like this:
"I can not say it in words. I know the answer -I can feel it, and I can feel myself
knowing it. But to
simply use words to describe an indescribable sen-sation is impossible."
Your natural reaction to this bull is, "What a phony!" And of course, he is a phony.
But he's also sincere. He truly believes he understands all the mysteries of the
universe, and those many and varied teachings that make up the answers to those
mysteries are things that must be experienced first hand. Things can be explained
to you, but they can't be felt unless you yourself have felt them.
So here is your passport to the world of hacking outside this book. You now know
the ideas, the methods, the information and facts that will allow you to begin a
hack in a systematic way, and you know what can be done to minimize mistakes
and wasted effort, and reduce your chances of getting caught. But naturally, that is
not enough. As with any hobby/game/education/occupation it takes trial and error,
practice and experience, lots of time and patience and practice and more practice,
before things work out as you would like
Some Thoughts
To The Concerned Administrator
If you have read this book because of your in-terest in law enforcement, security,
or the mindset of the computer delinquent, then you should have by now learned
dozens of ways the most seemingly airtight of security systems can be broken and
penetrated. You should have, by now, made up a comparable list of ways to protect
against each of the methods I've described.
Such a list should include stressing to your sys-tem's users the importance of
keeping good pass-words, regularly changing them, and taking note of the login
message which will display the user's last login date, time and place.
Explain to users that they should never reveal any information of a confidential or
suspicious na-ture over the telephone, through the postal service or electronic mail,
or in "chat" mode. Tell your users that if they are asked to reveal such things as
pass-words, they should simply respond, "I can not help you with that," and end all
communications. They should not reveal name or phone number, e-mail address or
physical address. All that is required is that statement. Any caller with a legitimate
com-
167

plaint or concern will be able to deal with the situation. All others will be hackers.
Set up a means by which legitimate users can question a suspicious character
lurking about the offices without seeming to be rude or obnoxious if the "character"
has an honest reason for being there.
Don't let your users become complacent about security, but don't overwhelm them
with it either. Most people will follow a few rules, even if it in-conveniences them
slightly. If your demands are too outrageous however (changing passwords at
every login, for example), none of your users will comply. Make sure they
understand why you are concerned. Point out the loss to them if security is
breached. Make sure they understand how impor-tant all of them are in
maintaining safety not just for themselves, but for every other member of the
organization, and every other member of any group connected with yours.
Finally, to really ensure that security is as close to 100% as possible, set up a
regular maintenance and clean-up schedule. Actively look for holes in your
system's armor. If you hear of hacker attacks or viruses at other sites, learn about
their problems and see that they don't happen to your own site. Fix known bugs
immediately and promptly remove all debugging tools and options. One
investigator has estimated that a third of the security holes he has found were due
to debugging options.
If an employee leaves your organization, im-mediately erase their access and
change everyone else's access codes. Notice that when you erase the ex-
employee's account, you must strike a balance between fair-warning and urgency.
A disgruntled employee will be even more vengeful if you de-stroy a year's worth of
work in addition to firing him and closing his account. But giving a warning too far
in advance allows viruses, time bombs and trap doors to creep into your system.
Numerous pieces of literature are available for any machine detailing specific
security measures an administrator should take. Make use of these. They will
point out flaws you could never have dreamed existed.
Ultimately, the little bit of extra work this all involves will prove its immense worth.
Some Thoughts
To The Concerned Hacker
You've come this far and you still have doubts about success? I guarantee you, if
you care about learning to hack, you will become proficient in the art.
If you've tried and tried and tried, but you still haven't managed to get past finding
a phone num-ber - or perhaps you can't even get to that - you can still count
yourself among one of the few true hackers so long as your intentions are good,
you play it safe with hacker security, you intend to act ethically when you do come
onto a system, and you intend to enjoy your life to its fullest potential.
After all, that's what a hacker is and does.
Congratulations and good luck to you: now you know the Secrets of a Super
Hacker!
And you, too, are one.
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Further Reading
Hacking begins and ends as an intellectual exercise. What that means is, if you
want to continue to experience the thrill of tap dancing through the nation's

computer systems, you must have thor-ough knowledge of what goes on within that
playing field of networks, telephones, terminals and users.
If you expect to get in and out of the really big systems - governmental and
corporate - you must be intimately familiar with the operating sys-tems, acronyms,
weird jargon and the way people think.
I highly recommend - at least for your own enjoyment and to further your interest
in the world of deviant computing - the books listed below.
The Books
Berkman, Robert I. Find it Fast: how to uncover expert information on any subject.
Harper and Row Publishers. New York: 1987. There are many books of this kind; if
you can't find this particu-lar one, it might be helpful to see if you can lo-cate
others. Berkman lists some good phone numbers and addresses of organizations
you can get in touch with to help you get information in lots of areas necessary for
a hacker to know about, including: companies, special/company libraries,
governmental documents, etc. If for no other reason, find this book to read the last
couple chapters. In them Berkman gives you his tips for extracting information
from people. It may not all be directly applicable to social engineering, but it will
surely help you out.
Cornwall, Hugo. The Hacker's Handbook. E. Arthur Brown Company. Alexandria:
1986. This book is geared toward United Kingdom hackers, especially those with
knowledge of electronics and ham radio. It often talks in general terms rather than
specifics, and is not as handy as the title seems to indicate. (Unless you're in the
UK and/or have a technical understanding of electronics. If you're the former, then
this book will probably be of some assistance. If the latter, there's probably nothing
in here you haven't already thought of yourself.)
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Farr, Robert. The Electronic Criminals. McGraw-Hill Book Company. New York:
1975. Not too much here about hacking per se, but there are many helpful and
exciting anecdotes to aid you in your social engineering and trespassing skills.
Forester, Torn and Morrison, Perry. Computer Ethics: cautionary tales and ethical
dilemmas in computing. MIT Press. Cambridge, MA: 1990. Computers and ethics.
That's what hacking is all about.
Glossbrenner, Alfred. How to Look it Up Online. St. Martin's Press. New York:
1987. Includes many useful phone numbers (voice and modem), ex-planations of
the various services offered and how to use them. Glossbrenner's books are often
called "The Bible of X." X being whatever topic he is currently writing about. Check
out his other books, too.
Hafner, Katie and Markoff, John. Cyberpunk. outlaws and hackers on the computer
frontier. Simon & Schuster. New York: 1991. Learn from their mistakes! Profiles
of three "outlaws and hack-ers" are given here. Sprinkled throughout are helpful
hacker hints, interesting histories and revelations of behind-the-scenes goings-ons
at your favorite hack targets. Possibly more im-portant than all that is to see how
these master hackers got caught, so you can do just the op-posite of what they did.

Landreth, Bill. Out of the Inner Circle. Microsoft Press. New York: 1984.
"Reformed" hacker Bill Landreth uses his expertise to show system op-erators and
computer managers how they can prevent their security from being breached. Be-
cause Landreth has had actual hacking experi-ence, this book is more useful to the
hacker than other books of its kind. Includes some interest-ing anecdotes and
useful information.
Parker, Donn B. Computer Crime: criminal justice resource manual. SRI
International. 1988. A Na-tional Institute of Justice publication intended for feds
and phone cops. Some useful hacker tips can be found here and there, but more
im-portantly, it is essential for you to learn how you will be investigated so you can
protect against it.
Rothman, David H. The Complete Laptop Computer Guide. St. Martin's Press. New
York: 1990. This book is a must-read for out-of-towners. Handy information is
given on the laptop and modem laws in countries all over the world. This is done
without neglecting the United States. if you need a good source for any portable
corn-puter information, this book is the place to find it.
Sterling, Bruce. The Hacker Crackdown: law and disorder on the electronic frontier.
Bantam Books. New York: 1992. There's a lot of history and homages herein.
Much ado about many topics related to hacking, cracking, phreaking, partying and
wild boys having a good time cruising through computer networks. Also, Sterling is
a good writer.
Stoll, Clifford. The Cuckoo's Egg. An instant classic, this book is an intriguing mix
of detective story and cracker espionage. Don't ask questions: just read it.
Zarozny, Sharon. The Federal Database Finder: a directory of free and fee-based
databases and files available from the federal government. Information USA, Inc.
Chevy Chase: 1987. Lists govemmen-tal contacts to find out about various
databases. Many such directories exist, this being just one.
Other Sources
Keep up to date with all the above-ground computer mags and newspapers, college
and company newsletters, and computing service pamphlets from various sources.
You will find that most of this information is totally useless and/or bogus, but every
once in a while you'll get a lead or a good idea.
And you can use straight computer magazines to get tons of free literature from
companies. You can even get the magazines for free if you convince the
subscription department that you are someone in the industry. There are two ways
to do this. The way I do it is I go to the library and borrow some computer
magazines.
I tear out the "Reader Information Postcard" from the back, and as I'm going
through the issue, circle the
170
numbers for products which interest me. I get information from a lot of different
companies, as well as free disks and posters. When I fill in my name and address, I
put myself down as president of some made-up company. (There are usually spaces

on these cards to enter your title and company.) After awhile, the magazine
subscription department goes through its mailing list, finds President so-and-so,
and sends me a form to fill out which entities me to a free subscription to their
journal! (Note: The form they send you usually contains a lot of nosy questions.) If
your library doesn't carry a magazine you'd like to receive, you can always just type
up a letter to the subscription department of that magazine, and ask about rates for
'buyers." You see, they are only interested in giving away free mags to people who
spend a lot of money at their companies. By the way, if your library does get one
of these magazines, there's no sense in using these tricks to steal a subscription, is
there? In any case, for the real inside dope on the hacker scene, you want to go to
the underground press. There are many, many hacker/phreak/anarchist journals
flying around. Most of these can be found on-line. That is, you get them from
anonymous FTP, or download them from BBSs. They are all free, and legally free.
Certain nefarious presses have been selling this stuff through mail order for
exorbitant prices. If you've bought any of it, you've been screwed. There's no
reason to buy it when you can download these journals yourself and print out the
good parts. These zines are often written by cocky, spaced out adolescent weirdos
who don't know much except that they hate everyone and everything. Sometimes
they contain decent information, but often it is just a bunch of how-to-be-an-
asshole. Alot of the articles ("philes") you'll find in these journals are simply
rehashings of mainstream works, such as down-to-earth retellings of technical
articles. But I have come across useful stuff in these things. In the very least,
reading these journals makes you feel good, because you'll end up thinking to
yourself, "Gosh, these so-called hackers don't know much more than I do."And it's
true. You can know a lot about computers; you can learn a lot about hacking, but
ultimately, the greatest hackers are the ones who are most dedicated to what they
set out to do. There are no algorithms to follow to become a good hacker. There is
only trial and error, continued patience, and a loyalty to one's own ethics.
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Glossary
acoustic coupler -A device consisting of two cups mounted on a base, into which
one inserts a telephone handset. The acoustic coupler is connected to a modem,
which sends its signals directly through the mouthpiece of the phone, and receives
signals through the earpiece. Useful for hacking on-the-run, such as from
telephone booths and public fax machines.
amplifier - A device for increasing the amplitude of a signal without altering its
quality.
analog signal - An output that changes in proportion with changes in the input
producing it.
anonymous FTP - The ability to transfer a file from a remote computer connected to
Internet without having an account on the remote computer. (Though the remote
system actually does know who is logged in.) One enters of anonymous" for

username, and usually one's e-mail address for the password. The program that
performs the file transfer is called FTP.
application program - Any software that is not part of the operating system. A word
processor is an application program. These are where you hide Trojan horses.
Sometimes called "app" for short.
archive - Several files grouped together and generally compressed into a single file.
This is done to facilitate uploading and downloading those perhaps unwieldly files to
other sites. Archive also refers to a computer or drive which acts as a repository for
files, especially a drive which can be accessed via FTP.
asynchronous - Multiple programs or processes overlapping each other in execution
and pos-sible memory. An asynchronous attack on a system involves one program
attempting to change the parameters that the other has checked as valid but has
not yet used. For ex-ample, it is illegal for just any old user to invoke the "su"
command to make himself a superuser - doing so gets an error message. But if the
contents of memory that hold the "reject request for superuser status" are changed
to "accept
173
request for superuser status" by another process, then the original "su" command
will exe-cute.
avatar - Alternative name for the root or
superuser on a (usually UNIX) system. In Hindu mythology, an avatar is the
incarnation of a god.
backbone site - Key USENET and e-mail site which processes a large amount of
third-party traffic. That is, it receives and sends news and messages to other sites.
back door - Synonym for trapdoor.
baud - Pulses per second (pps), with the as-sumption that each pulse is identical in
amplitude. One baud is considered to equal one bit per second. Thus, when all
pulses have the same amplitude, baud refers to bits transmitted per second.
BIOS - Basic Input/Output System. Consists of a piece of code used to govern the
elementary system-level functions of a computer.
bit - The smallest unit of data that a computer can
understand.
BITNET - A network of normally mini or main-frame computers. BITNIET connects
many universities and colleges together. It provides e-mail and file transfer
capabilities. It does not have the ability to do remote login (telnet sessions).
BBS - Bulletin Board System. A computer set up to receive modem calls. Users
dial in, then have access to various features including e-mail, message exchanges,
games, and text files.

boffin - Term used circa World War 11 to refer
with admiration to hacker-like folk who wanted to understand how the world
worked, and used their knowledge to invent accouterments for the world. Now we
refer to ourselves as hackers.
browsing - To ferret out data that has been left behind in computer memory or on
storage media after the termination of a critical pro-gram or process.
bps - Short for "bits per second."
buffer overflow - A buffer is a (usually tempo-rary) holding area for data. Overflow
happens when excess data is fed to a buffer, without giving it time to digest
previous intake. Two reasons for buffer overflow: The buffer may not be sufficiently
large to contain all the data that is needed before processing of that data can begin,
or there may be a mismatch in the rates of data production to data consumption. A
person might try and hack his way out of a program by inducing buffer overflow.
byte - 8 bits. Informally, a byte is a small amount of memory, just enough to hold
a single letter, digit, or other character.
C - A popular programming language that, along with its cousin C++, any hacker
should have at least a passing familiarity with. UNIX is written in C.
chat - To talk to another user online. In BBS circles, chat would imply talking with
the sysop on a single-user system.
CCTV - Closed Circuit TeleVision. Security cameras set up in office buildings and
else-where are monitored on CCTV.
CD-ROM - Compact Disc Read Only Memory. Some computers use compact discs
the way other computers use floppy disks. Often large databases are distributed on
compact discs.
CIO - Chief Information Officer.
console - On a mainframe, the station which the system operator uses to control
the computer, or whichever tty the system was booted from. Also, cty and ctty.
console PBX - Desktop switching service.
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covert channel - A way to secretly communicate information out of a private domain
of a sys-tem, such as an account.
cracker - A hacker who does not respect the computers he or she hacks.
cty - Console tty. (Also ctty).
daemon - Short for Disk And Execution MONitor. A program that is not explicitly
started either by the user or the program the user is using, but rather one that lies

dormant, watching for a set of conditions to hold true, then it will start itself.
Pronounced "day-min" or "dee-min." Also, demon.
demodulation -The process of removing an audio signal from its high frequency
carrier. When a modem demodulates those funny beeps coming over the phone
line, it is shedding the high pitched, waste portion, and retrieving the usable
information.
demon -Similar to a daemon, except this program is invoked by a user or another
program.
DES - Data Encryption Standard. A standard encryption technique for scrambling
data.
detector - An electrical circuit used to remove the modulation from a carrier signal.
Also a device which makes use of such a circuit.
DOS - Disk Operating System. Term used to refer to operating systems in general,
or to the operating system of the Apple 11 series. Also used loosely to mean either
MS-DOS or PC-DOS.
dual-tone multifrequency dialing - A dialing method using a pair of tones, one high
and one low. Touch Tone phones use this method.
dumb terminal - A device that allows input to a computer (such as through a
keyboard) and output from the computer (through a video screen) - and nothing
else. Contrast with
smart terminal.
duplex - Simultaneous communication in two directions. Two telephones connected
together make a duplex system, but if one of the tele-phones has its mouthpiece
broken off, it be-comes a simplex system.
EDP - Electronic Data Processing.
e-mail - Short for electronic mail. Sometimes seen as email. The ability to have a
private message exchange between two or more users on a BBS, network, or other
computer system. Also refers to the message itself.
firewall machine - A machine equipped with various security features, used as a
gateway to protect the main computers. Users must get through the safety
features of the firewall in order to access the important computer or network
beyond.
FOIM - Field Office Information Management System, computer used by the FBI to
automate the routine administrative and record keeping functions of their field and
resident offices.
FTP - File Transfer Protocol. A set of protocols by which files can be transferred
from one computer to another. FTP is also the name of a program that uses the file
transfer protocols to move files back and forth between computers.

FTS - Federal Telecommunications System. A direct-dialing phone system used by
agencies of the federal government for voice, scrambled voice, high-speed data,
fax, and teletype communications.
group accounts - A single computer directory or account protected by passwords,
where the passwords are distributed to a number of users. For instance, all
secretaries at an office might use the same account.
hacker - Time for a pop quiz! Read this book, then use your own judgment to
compose a definition for the word.
175
handle - An assumed name; an alias. Often used on BBSs.
handshaking - The process or activity by which two separate pieces of hardware
coordinate their signals so that they can work together, usually to send messages
between them. When you call another computer on your modern, the two modems
must handshake to synchronize their responses.
intelligent terminal - A smart terminal.
interactive question and answer sequence - Ac-cess control system using a random
list of questions. Because of their personal nature, the answers should be known
only by the correct user and the system itself, thus authenticating account
ownership.
Internet - A very large network that connects just about any type of computer
together. It supports e-mail, file transfer protocol (FTP), and remote login (telnet).
interoffice telephone - A telephone not able to call the outside world. Or one which
only seems to be so because the security code is not known.
iron box - Perhaps not too accurate a name, since any hacker falling into a literal
iron box would certainly know about it! An iron box is a restrictive or otherwise
special environment set up on a system to trap unwary hackers into staying on the
line long enough to trace. The trap may be a simulation of the actual system, or an
abundance of groovy text files to read, or something simple like slowing down the
system to a crawl.
ISIS - Investigative Support Information System, used by the FBI as a massive
database of important ongoing investigations. Every piece of known data about a
case is entered, which can then be cross referenced and checked in-stantly.
Joe - An account which has the username, or a variation of the username, as the
password
(regardless of whether that usemame is, in fact, "Joe"). Joe accounts have been
called the "single most common cause of password problems in the modern world."
LAN - Local Area Network. A network that is linked locally, that is, within the same
room, the same building, or perhaps between adjacent buildings. Usually machines
in a LAN are connected via cables (such as in an office). Contrast with WAN.

letterbomb - A piece of e-mail that contains live data, with the purpose of causing
harm to the recipient's system. Might also be called a nastygrarn.
limited-use passwords - A passwording system that combines the standard reusable
password with once-only codes. These passwords may only be used a set number
of times, or until a certain date.
line - Pairs of connecting wires from a telephone
to a central office. Also, loop, telephone line.
Listserv - A program available on many BITNET computers that sends mail and files
to other computers. For example, if you want to start a mailing list, the Listserv
would send the files you want mailed to the appropriate destinations.
live data - Information in a data file which, under certain circumstances, gets
interpreted as instructions to the computer. For example: On the Apple lie it is
possible to turn an innocuous REM statement in an Applesoft BASIC program into a
nightmare. Slip a Control-D into the REM so that when someone lists the program
the AD will be printed on the first screen column. Any DOS command following that
character will be executed. One could write a program that does nothing, but if
anyone tries to list it, their disk gets initialized. More commonly, one thinks of live
data as control instructions to the terminal.
log - A record kept of computer activity; may be printed or stored to disk. System
operators are
176
fond of reading through their logs to spot hacker activity. If you find one detailing
your exploits, you'll want to remove the incriminat-ing parts of it.
login - To gain access to a computer, usually by entering the required username
and password.
logic bomb - A subversive piece of code in an application program that is executed
when specific conditions hold true. A disgruntled employee might, before quitting
his job, insert a line that says, "IF Joe Smith's account is deleted from the system
THEN instruct payroll program to combine all paychecks into one and mail them to
Joe Smith." A logic bomb is also called a time bomb.
lounging - See passive computing.
macro - A keystroke or short name that is used to reference a longer piece of text
or a series of instructions. For example, if you were writing a book about
Hieronymous Bosch, you might set up a macro in your word processor to insert his
name whenever you typed "Alt-H."
modulation - A process of loading a voice or other signal (wave) on a much higher
frequency carrier wave. When a modem modulates your data as you type on your
keyboard, it is converting the computer's digital pulses into frequPinvies within the
audio range that the telephone transmits.

modem - MOdulator-DEModulator. A device that modulates computer data into a
format that can be sent through telephone wires, and can demodulate information
that has been sent to it from another computer.
MS-DOS - Generic version of PC-DOS, operating system software that ruins on IBM
PCs, clones and compatibles.
MULTICS - Short for MULTiplexed Information and Computing Service. An antique
operating system that was built with security in mind.
multiplexing - The use of different modulating frequencies for the simultaneous
transmission of signals.
NCIC - National Crime Information Computer, run by the FBI and containing
information about stolen vehicles, missing and wanted persons, and arrest records.
NCIC is linked with TECS, - the computer system of the Treasury Department - as
well as many state computers.
net - Short form of network. Often used as part of words that refer to a specific
network, such as the Internet.
network - Two or more machines connected together for the purpose of exchanging
data.
newsgroup - A section of USENET devoted to the discussion of a particular topic.
node - An individual machine (such as a computer or printer) that is connected to
other machines in a network.
OCIS - Organized Crime Information Systems, run by the FBI. Allows FBI field
offices in separate locations to read and share informa-tion collected.
once-only codes - A password that can only be used for one access.
operating system - (Abbreviated OS). The control program of the computer which
oversees how the system interfaces with the user and peripherals. Examples: DOS,
MULTICS, MS-DOS, PC-DOS, PRIMOS, UNIX, VMS.
OS - Operating System.
PAD - Packet Assernbler/Disassembler.
PABX - Private Automatic Branch eXchange. A PAX with outside-dialing capabilities.
packet assembler/disassembler - One of the node computers of a public data
network.
177
packet switching - A method of transmitting data along computers in a network.
Each in-termittent computer is a PAD that receives chunks of data (128 bits long,
following the X.25 standard) and routes them onward along a path to the receiving
computer.

parser - A program that looks at some inputted text and tries to make sense of
what it means. For instance, when you are using MS-DOS, you might type "del
filename." The parser inside MS-DOS figures out that what you want to do is erase
the file called "filename." A parser in an adventure game looks at commands such
as "Walk to the door and knock on it," and, if it was a good parser, would, for
example, interpret the word "it" as referring to the door.
passive computing -To monitor the contents of a computer screen through
surreptitious means, using one of several methods such as Van Eck phreaking, or
cabling the target computer to a second, secret monitor or VCR. Also, lounging.
pass phrase - A series of words or syllables used for access control instead of a
password.
password - A word, phrase or other series of characters needed as part of the login
proce-dures to access a computer system.
PAX - Short for Private Automatic eXchange. A network of phones, not connected
to outside lines. Used for faster and more secure com-munication.
PBX - Short for Public Branch eXchange. A net-work of telephones, each equipped
with its own switching arrangement, instead of requiring switching to be done from
a separate switchboard. Multiple phone numbers may ring each phone, and special
function buttons are pressed on the telephone to either answer a call or transfer it
to another telephone.
PC-DOS - Operating system supplied by IBM for
use with its personal computers.
PDN -Short for Public Data Network.
phreak - One who hacks the telephone system, usually to obtain free long distance
calling and other services such as conference calling. In the original sense, phreaks
used blue boxes, black boxes, green boxes, etc. - specific pieces of hardware they
had built to generate signals that would cause the phone network to do their
bidding. The phone companies have taken precautions and nowadays the boxes will
usually not work (and will usually get you arrested). Phreaking has become more
code-oriented; stealing calling card numbers and otherwise charging phone perks to
another's bill. Phreaking is related to hacking yet it is entirely different, a field of
expertise unto itself. It has its own set of rules and jargon, and even a
knowledgeable hacker who stumbles upon a phreak BBS is likely to be confused by
the discussion. As they say, it's good to know a foreign language. For hackers,
that language is phreak.
piggybacking - In the physical sense, to get into a locked building by following in
another person who has the key, card, or security clearance to enter. In the
computing world, to login to a system by tapping into another user's communication
with the computer. Usually done at the end of the user's call, and usually by
chance, piggybacking can only be done when the computer doesn't realize that the
first person has disconnected.

plaintext - In encryption, the message (or file) that is encoded.
PLE - Public Local Exchange. A local network of telephones usually in separate
buildings, houses or offices, and operated by an outside phone company.
post - To publish a letter, article, essay, story, graphic image, computer file or
whatever -but usually a letter or article - electronically, by sending it to the public
message area of a BBS or newsgroup.
PPN - Project-Programmer Number. The TOPS-10 operating system used PPN to
refer to a user's
178
ID number. PPN may at times be applied to other systems.
pps - Pulses Per Second.
premises wiring - The wires inside a building that are used to connect telephones to
phone company lines.
PRIMOS - An operating system for PRIME computers.
process - A program that a computer is currently running.
process command - A command to the operating system that requests a listing of
all active processes. For instance, under UNIX one can type "ps -f` 'to see what
everybody else logged on is doing.
protocol - A set of rules used by software to in-teract with hardware. When two
pieces of hardware must interact (such as when two modems connect), they must
follow the same protocol, else communication between them will be impossible.
public data network - A network, such as Telenet or Tyrnnet, that uses packet
switching to con-nect computers; generally follows an interna-tional standard called
X.25.
pulse - A momentary flow of current, character-ized by a sharp rise and fall.
pulse frequency - Number of pulses per second.
receive only telephone - A phone that does not have a ringing circuit, and probably
doesn't have a dial or keypad; cannot normally be used for placing calls. These can
be found at public fax machines and some automatic teller machines. A hacker
would whip out his tone generator, hook it up to the telephone, and immediately
call China.
reverse social engineering - Tactic whereby the system user contacts the hacker for
advice, and
in the process of problem-solving, divulges confidential data.

root - The superuser account, the top level of a hierarchical directory structure, or,
in pro-gramming, the top node of a tree. For hacking purposes, we talk about the
superuser aspect of it. It is often the hacker's goal to obtain root access to a
system.
salami technique - A method used to steal large sums of money over a long period
of time, based on the assumption that little amounts won't be missed. A computer
that handles fi-nancial transactions is reprogrammed so that when fractions of
pennies accrue in an account due to interest earned, those fractions are rounded
down, and are placed into a dummy account. The criminal then makes off with the
account.
scavenging - To look through garbage bins in search of discarded, but still useful,
informa-tion. Also, trashing.
script - A command file that is executed auto-matically following handshaking by
the caller's communications software; eliminates the need for the caller to
remember his or her terminal type, login procedures, and whatever other input is
required by the remote computer.
security through obscurity - Here is a pre-login message that exemplifies the
opposite of secu-rity through obscurity: "Thanks for calling Hey There Travel
Agency Network. Please enter your five character password in the form ABC-12
where ABC stands for uppercase letters and 12 stands for digits. If you need help,
call Cheryl in data processing at (818)-XXX-XXXX." Obviously there are a lot of
security holes in this message. One would want to obscure it, by changing it all to
one cryptic character, such as >. Security through obscurity can also refer to known
bugs being left undocumented in the hopes that no one discovers them.
serial - Passing information one bit at a time in sequential order.
179
shell - An interface or command interpreter be-tween the user and computer.
Basically, whenever you input a command to a computer you are using some kind
of shell.
shoulder surfing - Finding out what a user is typing by looking over his or her
shoulder, and watching the keyboard or monitor.
simplex - One-way communications. (Compare with duplex.)
simulation - A program set up by a hacker that mimics a legitimate aspect of the
system, such as login screens.
smart terminal - A terminal that has memory, editing commands, graphics,
computational ability, security features, or is somehow oth-erwise a computer in its
own right, and not just the input/output to a mainframe. Also called an intelligent
terminal.

social engineering - To use lies, deceit, play acting and verbal cleverness to trick a
legiti-mate user into divulging the secrets of the sys-tem.
source code - The list of instructions that a programmer types in that make up a
computer program. This list is the "source" text that the computer will use when it
translates the program into machine language.
stand-alone - A computer or computer system that will operate without requiring
additional equipment. A terminal is not a stand-alone device, since it must be
connected to a computer for it to work. A Macintosh is a stand-alone device.
superuser - The sysop, system administrator (sysadmin) or system manager, or any
person who has no restrictions on usage on a machine. The superuser can create
and delete accounts, view and change passwords and files, and is usually
responsible for machine maintenance.
superzap - To use special debugging or computer maintenance software tools to
modify data. Usually to do so constitutes a security breach, or in the very least,
violates the intended usage of the software one is altering.
switch - To make a connection; or a system of connecting pairs of telephone lines.
In surveil-lance, the redirection of output of two or more cameras to the available
viewing monitors.
startup file - A file that is executed when a corn-puter is booted, or when one logs
into an ac-count. Usually this is a plain ASCII text file containing shell commands
which are run as a batch. On MS-DOS and PC-DOS machines it is the
AUTOEXEC.BAT. UNIX uses Jogin ("dot login").
sysadmin - SYStem ADMINistrator. The overseer of a computer or network.
sysop - SYStem OPerator. The person who takes care of and controls a BBS. The
people who help the sysop are "co-sysops," or simply "co's." Pronounced "sis-op" or
"sy-zop." Often written as "SysOp", and sometimes as "sys-op" though this latter
version is pretty larne.
talk mode - To engage in on-line conversation with another user. What you type
appears not only on your screen, but on his or her screen as well, and vice versa.
If you were on a UNIX system and you knew that user Srnuggy was logged in also,
you would type "talk smuggy" and Smuggy would receive a message s a-y-in g-you
wished to talk. Smuggy would respond with "talk yourname," and the conversation
would begin. In the BBS world, this is more commonly known as chat mode.
TAP - Technological Assistance Program.
telnet - A set of protocols used to access one machine through another. There are
two types of programs used to do this. One, called telnet, establishes a VTl00 type
terminal emulation to the remote computer. The second, TN3270, establishes a full
screen connection.
180

Terminal - Usually refers to a dumb terminal. In general, it is a combination
input/output de-vice (a monitor and keyboard) connected to a remote computer.
TG - Technical Guide.
tiger team - A hacker or group of hackers who are engaged by an organization to
find the security flaws in that organization's computer system.
tone generator - A device which includes two exterior components - an acoustic
coupling device and a telephone keypad - with interior electronics that generate
tones needed to operate a telephone. Often seen as a portable tone dialer, these
devices are small enough that they will generally include a clip so that they can be
hooked to one's belt and easily carried. Also called "tone dialer."
trapdoor - An undocumented way of gaining access to a computer system, usually
thought of as a method of entry put in by a system programmer who wants to
break into the computer after he is no longer employed by the company. A
trapdoor may also lead to hidden areas of a system. A different kind of trapdoor
may be unintentional; for example, a laxness in encryption procedure that allows
one to deter-n-dne the plaintext without knowing the key. Synonym for back door.
tracking - An investigator's use of system logs and other audit trails to look and
see where a hacker has been and what the hacker has done.
Trashing - To scavenge through the garbage of a business or organization, in the
hopes of finding useful information, discarded manuals and the like.
Trojan horse - A section of code hidden inside an application program that
performs some secret action.
Trusted Hosts - On some UNIX implementations, it is a list of other computers and
users who require no password for entry.
TSR program - Short for Terminate and Stay Resident program. A TSR program is
one that is put into memory and stays there, even after other programs are loaded
in. The TSR usually stays "hidden" in the background until a person or the
computer decides to use it. For example, a program to keep track of what keys are
being pressed might be loaded into memory as a TSR. As the user switches from
one application to the next, the TSR continues to run silently in the background,
capturing keystrokes.
UNIX - An operating system originated by Ken Thompson and Dennis Ritchie at the
Computer Research Group at Bell Labs. True hackers, they wrote what would
become one of the most predominant operating systems so they could play Space
Travel without getting a jerky response from the MULTICS time-sharing system
they had been forced to use.
USENET - A huge Internet-based message ex-change. Users from all over the
world read and exchange news, notes, comments, stories, files, humor and help on
all topics under - and above - the sun.

Username - The name one uses on a computer network or system to identify
oneself. Usually it is some variation on the person's real name.
vandal - A cracker, and probably a not-too-tal-ented one, who tries to delete files,
crash sys-tems, leave nasty messages everywhere and generally is a big pain in the
ass.
virus - A worm implemented as a Trojan horse that contains a logic bomb.
VMB - Voice Mail Box. Voice mail is a comput-erized phone answering setup that
stores in-coming messages in digitized form, on disk.
VMS - Virtual Memory System, the operating system used on VAX minicomputers,
made by DEC.
WAN - Wide Area Network. A network where the linked machines are greatly
separated from each other, usually not within walking distance. Computers in a
WAN are generally connected
181
via phone lines (such as Internet). Contrast with LAN.
Warez dOOd - A silly name for people who trade or sell pirated software. Warez
dOOd = (Soft) wares dude.
WATS - Wide Area Telecommunications Service. Service which allows calling within
a (possibly interstate) geographic region, often toll free.
worm - A program whose purpose is to reproduce. A worm will copy itself endlessly
into multiple directories and onto any disk that presents itself.
182
Appendices
183
Blank Page
184
Appendix A:
Explanation of Some ASCII Codes
ASCII character code tables are very popular in computer books. Hardly a
computer book has been written that doesn't have a list of ASCII codes, even if
ASCII has nothing whatsoever to do with the book.
Since ASCII tables are so prevalent, I'm not including a full one here. However, I'm
giving you something much more useful to use in your hacking endeavors: an
explanation of the non-printing ASCII characters. It's just about impossible to find

a listing anywhere that tells you what these things do or mean. Usually you just
see the abbreviations listed - cryptic codes like "ENQ," "SI" and "DC1.`
As you read through the list, try to think of ways you can use the information in
your hacking.
Remember, these codes may not be acknowledged by all remote computers, but
often they will be valid, and can be strategically sent to make a computer think
something is happening when in fact it is not.
0 NUL NULI
No character - used for filling time in synchronous communication, or for filling in
extra spaces on disk/tape when there is no data.
1 SOH Start Of Heading
Indicates the start of a heading which contains addresses or routing information
that applies to the text that follows the heading. (Control-A)
2 STX Start of TeXt
Specifies the end of the heading, and the beginning of a block of text to which the
heading applies. (ControlB)
3 ETX End of TeXt
Indicates the end of the text that STX started. Often used as a break key. (Control-
C)
4 EOT End Of Transmission
A transmission may have included one or more "texts," each with a heading.
Indicates the last
185
text has been sent. Often used under UNIX to indicate the end of input. (Control-
D)
5 ENQ ENQuiry
A request for a response from the other end. It can be used as a "Who are you?"
request for a station to identify itself. Might also be used to ask if a message has
been received. (Control-E)
6 ACK ACKnowledge
Character transmitted by a receiving device as affirmative response to sender.
(Says, "Yep. 1 got the message.") Used as a positive response to an ENQ. (Control-
F)
7 BEL BELI
Used when there is need to call personnel's attention; may control alarm or
attention devices. (Control-G)
8 BS Back Space
Indicates the movement of the printing mechanism or display cursor one position
back. (Control-H)
9 HT Horizontal Tabulation

Moves cursor or print mechanism to next preassigned "tab" or stopping position.
Often the same as pressing the Tab key. (Control-1)
10 LF Line Feed
Move printing mechanism or display cursor to
start of next line. (Control-J)
11VT Vertical Tabulation
Print mechanism or display cursor to next series of preassigned printing lines.
(Control-K)
12 FF Form Feed
Moves printing mechanism or cursor to starting position of next page, screen or
form. Often clears the display screen. (Control-L)
13 CR Carriage Return
Moves to starting position of same line. Often corresponds to the Enter or Return
key, or Control-M.
14 SO Shift Out
Indicates that the code combinations which follow should be interpreted outside
standard character set until an SI is reached. (Control-N)
15 SI Shift In
Indicates the code combinations which follow should be interpreted according to
standard character set. Sometimes aborts output while
allowing program to continue. (Control-0)
16 DLE Data-Link Escape
Indicates the following character is a control code rather than data. (Control-P)
17 DC1
18 DC2
19 DC3
20 DC4 Device Controls
Characters for the control of ancillary devices or
special terminal features. DC3 (Control-S) usually pauses local reception of output
until a DC1 (Control-Q) is given. DC2 is Control-R. DC4 is Control-T.
21 NAK Negative AcKnowledgment
Character transmitted by a receiving device as a negative response to an ENQ. A
NAK says, "What'd ya say? I didn't quite catch it." (Control-U)
22 SYN SYNchronouslidle
Used in synchronous transmission systems to achieve synchronization. When no
data is being sent, synchronous transmission system may send SYN characters
continuously. (Control-V)
23 ETB End of Transmission Block Indicates the end of a data block for
communication purposes. Used for blocking data where block structure is not
necessarily related to processing format. (Control-W)

24 CAN CANcel
Data preceding it in a message or block should be disregarded, usually because an
error has been detected. Sometimes used as an "abort transmission" command.
(Control-X)
186
25 EM End of Medium
Indicates physical end of a disk, tape or other medium, or end of required or used
portion of that storage medium. (Control-Y)
26 SUB SUBstitute
Substituted for character found to be erroneous or invalid. Sometimes used as a
break command.
(Control Z)
27 ESC ESCape
Character intended to provide code extension by giving alternate (usually control)
meaning to characters that follow.
28 FS File Separator
29 GS Group Separator
30 RS Record Separator
31 US Unit Separator
Information separators may be used in an optional manner except that their
hierarchy is FS (most inclusive) to US (least inclusive).
32 SP SPacebar
127 DEL DELete
187
BLANK PAGE
188
Appendix B:
Common Defaults
These are words that are often used as default names and passwords. Try using
various combinations of them as both name and password, then one as name and a
different one as password, etc. Besides these, try using variations on the company
name and the type of service it offers as names and/or passwords. Try things like
putting a slash in front of words (such as '7guest"), or separating two words with a
slash, as in "MAIL/company name." Also try putting spaces in the words (i.e., "New
user") and varying capitalization (i.e., "NewUser," "newUser," etc.).
Also worth trying are easily remembered numbers (1000, 99999, 12345, 101010,
etc.), and repeated letters - if a password can be up to eight characters, try
"XXXXXXXX," and other things like it.
Don't forget single letters and digits, asterisks and other above-nurnber characters,
and plain 'n simple blank line Returns.

guest start accoun supruser
visitor Su default superuser
visit 0 a anonymous
intro email x user
demo use q demonstration
mail enter Z instructions
new newuser sysop introduction
manager 1 password name
test Sys system systest
field temp instr passwd
pswrd 9 startup id
tty root go train
trainer tempy training info
testing mini hello techsupport
Now here is a whole slew of defaults, common passwords and account names for
different operating systems and other kinds of computers. Most are probably out of
date or otherwise inoperable, but it gives you an idea of what is expected in these
environments.
Credit Bureaus
TRW uses a password of the form:
"LLLNNNNNNNLNL" ( Example - abc123456d7e)
where L is a letter of the alphabet, and N is a digit. Note that the actual password
does not have spaces between each letter and number.
189
For CBI, the passwords are:
"NNNLLNNN-??"
Again, the Ns are numbers and the Ls are letters. A question mark refers to any
character. Note the hyphen placed between the last digit and the first wild
character.
DEC-10
UIC Passwords:
(User Identification Code):
1,2 syslib, operator,
manager
2,7 maintain
5,30 games
FTP
Accounts: anonymous, guest, visitor
Password: Carriage Return
HP-X000 (MPS OS)

Login using "Hello [job IDI,[Username][User Passwordl.[Account Namel,[Group
Name][GroupPassword]"
Accounts: Mgr.Telesup,hp3
Mgr.Telesup,hponly
Mgr.Telesup,pub
Mgr.Hpoffice,pub
Mgr.Rje,Pub Manager.itf3000,pub
Field.support,pub (password: f1d, field)
Mail.telesup,pub (password: mail)
Mgr.rje
Field.hppl87
Field.hpp189
Field.hpp196
Field.support,pub
Hpoffice,pub
IRIS
Account names or passwords: manager, boss, software, demo, PDP8, PDP11,
accounting
Libraries
Account names or passwords: library, syslib, lib, circ, cat, bib, biblio, catalog, file,
minicirc
NOS
Accounts: $system, systemv
PRIMOS
Account names: admin, guest, prime, primenet, test, system, lib, dos
Passwords: system, sysman, netlink, primenet, manager, operator, prime, primos,
primos-cs, test, guest
UNIX
Accounts or passwords: root, admin, sysadmin, Unix, UUCP, rje, guest, demo,
daemon, sysbin, who, whois, time, date, ftp, anonymous
VM/CMS
Accounts or passwords: autologl, autolog, cms, cinsbatch, erep, maintain, maint,
operatns, operator, rscs, smart, sna, vrntest, vrnutil, vtam, dial
VMS
Accounts or passwords: system, guest, default, operator, manager, syslib, uetp,
sysmaint, service, digital, field, service, guest, demo, deenet, dec
190
Appendix C:
Common Commands

What would you do if you dialed a number, got connected, and saw nothing but
this: # on the screen? Out of security interests, many systems will not identify
themselves or offer any text at all except a cursor and possibly a strange prompt.
This is called "security through obscurity." In these frustrating instances you will
have to try typing in every possible command you can think of until something
works.
This is a list of all the commands I remember being able to use in this sort of
situation. Besides these words, if the system gives you any information at all, like
company initials or weird words, try feeding back to it what it says to you.
Sometimes commands must be preceded by a control character. For example,
instead of typing "login," one types "/login."
Unless the system specifically asks for something (like a log-on ID in a particular
format) it's a good idea to try these commands, because you never know when one
of them will work.
date list log man
connect public
page time load trace
dir info
open net login call
begin sys
a go h logon
1 i
show q state phone(s)
help link
mail print x control
tele
? buy show @
bye
email shell menu sell hint
quit demo access demo
start
intro exit end run
shed
who whois on games
calender
191
BLANK PAGE
192
Appendix D:
Novice Word List
This is a list of words that turn up frequently as passwords. Using one of these as a
password usually indicates a novice or disinterested computer user. In other words,
if you happen to know a certain user is new to computing, either due to postings on
a bulletin board, age, or whatever, then these are the words you would want to try.

In addition to these words, you will want to try the letters of the alphabet, various
combinations of letters, and numbers, and things easily typed on a standard
keyboard, such as "poiuy" and "yhnujm". Also for novices, try names and team
names, cars, colors, animals, job-related words, pet names, music groups, local
popular radio station call letters, local slang, names of cities or towns, company
names, and names or type of computer. It For parents, try things like "dad,"
"daddy," mother," or "mommy." For people of certain occupations, something like
"Dr. Daddy" may be more appropriate.
Two lists of words are given. The first is my own. The second, written by Robert
Morris Jr., was used by the worm program that blazed throu the Internet in 1988.
Many of the words he used seem oddly chosen and superfluous, and there are many
others which I can't understand why he did not include. I have it listed here mostly
for historical reasons. I also think it's interesting to see how another hacker
handles a situation. Duplications between the lists have been removed from my
list.
My List:
account birthday disk
adventure black diskette
aid blue dollar
aids book/s dumb
alpha bowling earth
angel brain eat
ass breast fish
asshole car/s force
bach Christmas Friday
bard code fuck
barf comp fucku
baseball cow fuckyou
basic crazy games
basketball cunt go
bboard darkstar god
bbs dead golf
beam death ham
beta dick happy
big disc hell
193
hi nazi strike atmosphere
clusters establish
hitler no striker aztecs coffee
hockey o.k. stupid azure coke
home okay suck bacchus collins
hope open sun bailey
commrades extension
horses oreo sunshine banana
computer fairway
hump overload superbowl bandit condo
felicia
id pass superman banks cookie

ident penis system barber cooper
fermat
identify Pepsi talk baritone
cornelius fidelity
identity play television bass couscous
in please tennis bassoon creation
intro print terminal batman creosote
keyboard printer test beater cretin
kill pswd tester beauty daemon
king qwerty thanks beethoven dancer
kiss radar thunder beloved
daniel foolproof
later radio thunderbolt benz danny
life real tiger beowulf dave
lion red tincan berkeley december
little rex tits berliner defoe
login run tv beryl deluge
logon Saturday tyger beverly
desperate fred
love sex universe bicameral develop
manager shit user bob dieter
marijuana skull vagina brenda digital
me smart white brian. discovery
mensa snoopy who bridget disney
Mickey soccer word broadway dog
mine space world bumbling drought
modem spacebar yes burgess duncan
Monday starlight you campanile eager
money stars zoo cantor easier
moon start cardinal edges
mouse startup carmen edinburgh
glacier
music stop carolina edwin
caroline edwina
golpher
cascades egghead
gorgeous
Morris List: castle eiderdown gorges
cat eileen gosling
aaa algebra answer cayuga
einstein gouge
aaa algebra answer celtics
elephant graham
academia aliases anthropoge cerulean elizabeth
gryphon
aerobics alphabet anvils change ellen
guest
airplane ama anything charles
emerald guitar
albany amorphous aria charming
engine gumption

albatross analog ariadne charon engineer
guntis
albert anchor arrow chester
enterpise hacker
alex andromache arthur cigar enzyme
hamlet
alexander animals athena classic ersatz
handily
194
happening lynne Patricia Sal
target
harmony macintosh Peoria Saxon
tarragon
harold mack penguin scamper
taylor
harvey maggot persona scheme
telephone
hebrides malcolm percolate Scott
temptation
heinlein mark persimmon
scotty thailand
hello markus Pete
secret tiger
help marty peter
sensor toggle
herbert marvin phoenix serenity
tomato
hibernia master Philip sharks
topography
honey maurice Pierre Sharon
tortoise
horus mellon pizza Sheffield
toyota
hutchins merlin plover Sheldon
trails
imbroglio mets Plymouth Shiva
trivial
imperial michael polynomial
shivers trombone
include michelle pondering shuttle tubas
ingres mike pork signature tuttle
inna minimum poster Simon
umesh
innocuous minsky praise simple unhappy
irishman moguls precious singer unicorn
isis moose prelude single unknown
japan morley prince smile urchin
jessica mozart Princeton smiles utility
jester nancy Protect smooch vacant

jixian napoleon protozoa
smother vertigo
johnny nepenthe pumpkin snatch vicky
joseph ness puneet snoopy village
joshua network puppet soap virginia
judith newton rabbit Socrates warren
juggle next rachmaninoff
sossina weenie
julia nic rainbox sparrows whatnot
kathleen noxious raindrop spit
whiting
kermit nutrition raleigh spring Whitney
kernel nyquist random
springer will
kirkland oceanography rascal squires William
knight ocelot really strangle
Williamsburg
ladle Olivetti rebecca
Stratford Willie
lambda Olivia remote
Stuttgart Winston
lamination oracle rick subway Wisconsin
larkin orca ripple success wizard
larry Orwell robotics
summer wombat
lazarus Osiris rochester
super woodwind
lebesgue outlaw rolex Superstage
wormwood
lee oxford romano
support yaco
leland pacific ronald supported yang
leroy painless rosebud
surfer yellowstone
lewis Pakistan rosemary
Suzanne yosemite
light Pam roses swearer zap
lisa papers ruben symmetry
zimmerman
louis password rules tangerine
195
BLANK PAGE
196
APPENDIX E:
Job - Related Word List

These are passwords that might come up in a secretarial or office clerk setting. If
the system you're attempting to get into is an office, it's a good idea to try these
words before the novice list.
For office settings, also try the company name and variations (initials,
abbreviations), titles of software programs they might use there, and words related
to that particular job.
spread memo info work
spreadsheet/s
wp comp job office
word
file doc paper/s file/s
busy
notes report/s sheet/s type
document/s
txt text enter dbase
printer
database print journal process desk
desktop data write folders
secretary
computer term terminal news processor
letter/s mail mailing business
docs
read stuff project labor
public
week day phone/s lotus 123
disk disc level service admin
PC net network protect safe
boss software IBM Friday accounting
Monday book/s writer begin secretery
margin list field record check
sec pres manage table clock
197

BLANK PAGE
198
Appendix F:
Technical Word List
Most people who use computers are just casual users, but then there are the
powerusers- people like you - who know what they're doing and love doing it. These
sorts of people are also often fond of ham radio, science fiction and fantasy,
electronics, mathematics, chess, programming, and other related things. This list is
comprised of words taken from some of these categories. Also try words from the
Glossary. You'll notice that a lot of Star Trek words have been included here, as
Star Trek is big among computer users.
abort ambassador atheist
abortion anarchism attack
absolut anarchy avatar
absolute analog baggins
access application band
address arc bandwidth
ai archive bang
algorithm ascii barf
alias async baud
alpha atheism bbaggins
bboard chomp erotics
beam Christmas expert
beamup cluster external
berserk/er connect female
biff cowboy foobar
Bilbo crack/er fractal
Blast crunchy freq
Board crusher frequency
Bogon data frodo
Bomb date fronteir
Bones dbms frontier
Bridge demigod function
Broadcast demo gene
Buzz devil generation
Cable Diana genius
cage digital go
captain dipole god
central director green
chang dos grep
channel dump grok
chaos dvorak gronk
chen ebdic group
chess enterprise hack/er
chief enterprize ham
choke erotica hamradio
199

hobbit oscillator szone
home output tasha
horizontal overheat tech
host overload technical
hotkey picard technician
human piggy test
index power time
input pres tng
iris primos transport
isis procedure transporter
j1p prodigy travel
kermit protocol trek
king quartz treker
kirk quattro, trekie
klingon query trekker
Ian quit trekkie
lang qwerty trekky
language radio tribble/s
laser random troy
lee ravel tsupport
lord register tyar
male riker unix
man robot var
mark romulan variable
mask romulon vax
master romulun vector
matrix rtty virus
memory ryker VMS
mensa scotty Vulcan
menu scraft wan
modal shuttle Wang
mode shuttlecraft warf
model skip warp
modem skipzone WC
modulate space wheel
moon speed wizard
msdos spock worf
nc-101 star worm
net.god stars xmodem.
network startrek xterm
next sting ymodem,
nil strek zmodem
nill sttng yar
nim Su zero
node sundevil zoo
null super
object superuser
ohm support
OOP SWI
operation synch

200
Appendix G:
Social Security Number Listing
And ICAO Alphabet
The Social Security number has pretty much become the Great American Serial
Number. The Social Security Administration (there's that SS again!) wants to have
a number issued to every American newborn. In addition to maintaining records on
virtually every American, the SSA keeps track of millions of foreigners who work in
this country or who once worked in this country and have since retired to live
outside the US.
Except for a few numbers issued in the mid-1970s to military recruits, all Social
Security numbers contain nine digits. Those military SSNs contained ten digits
beginning with zero. There are very few of those ten-digit numbers around.
The first three numerals are known as "area numbers" because they indicate from
which state the subject applied for a number. Remember, SS records are
confidential and not available for public or even law-enforcement review.
Very few SSNs above 595 have been issued, so stay away from brute forcing those.
The 700-729 range was issued by the Railroad Retirement Agency years ago, and
so any SSN beginning with 700 or above would belong to older people. New
numbers in that range have not been assigned since1963. 596-599 has been
reserved for Puerto Rico, 600-601 for Arizona, and 602-626 for California -although
no numbers in any of these ranges has yet been assigned. (That is, there are
currently no SSNs between 596-626.)
Alabama 416-424
Alaska 574
American Samoa 581-585
Arizona 526-527, 600-601
Arkansas 429-432
California 545-573, 602-626
Colorado 521-524
Connecticut 040-049
Delaware 221
District of Columbia 577-579
Florida 261-267, 589-595
Georgia 252-260
Guam 581-585
Hawaii 575-576
Idaho 518-519
Illinois 318-361
Indiana 303-317
Iowa 478-485
Kansas 509-515
201
Kentucky 400-407
Maryland 212-220
Louisiana 433-439 Delaware 221-222
Maine 004-007 Virginia 223-231

Maryland 212-220 West Virginia 232-236
Massachusetts 010-034 North Carolina 237-
246
Michigan 362-386 South Carolina 247-251
Minnesota 468-477 Georgia 252-260
Mississippi 425-428, 587-588 Florida 261-267
Missouri 486-500 Ohio 268-302
Montana 516-517 Indiana 303-317
Nebraska 505-508 Illinois 318-361
Nevada 530 Michigan 362-386
New Hampshire 001-003 Wisconsin 387-
399
New Jersey 135-158 Kentucky 400-407
New Mexico 525,585 Tennessee 408-415
New York 050-134 Alabama 416-424
North Carolina 237-246 Mississippi 425-428
North Dakota 501-502 Arkansas 429-432
Ohio 268-302 Louisiana 433-439
Oklahoma 440-448 Oklahoma 440-448
Oregon 540-544 Texas 449-
467
Pennsylvania 159-211 Minnesota 468-477
Philippine Islands 581-585 Iowa 478-485
Puerto Rico 581-585 Missouri 486-500
Railroad 700-729 North Dakota 501-502
Rhodelsland 035-039 South Dakota 503-504
South Carolina 247-251 Nebraska 505-508
South Dakota 503-504 Kansas 509-515
Tennessee 408-415 Montana 516-517
Texas 449-467 Idaho 518-519
Utah 528-529 Wyoming 520
Vermont 008-009 Colorado 521-524
Virgin Islands 580 New Mexico 525,585
Virginia 223-231 Arizona 526-527
Washington 531-539 Utah 528-529
West Virginia 232-236 Nevada 530
Wisconsin 387-399 Washington 531-539
Wyoming 520 Oregon 540-544
California 545-573
••••••••••••••••••••••••••••••••••••••••• Alaska
574
Hawaii 575-576
New Hampshire 001-003 District of Columbia 577-
579
Maine 004-007 Virgin Islands 580
Vermont 008-009 American Samoa 581-585
Massachusetts 010-034 Guam 581-585
Rhode Island 035-039 Puerto Rico 581-585
Connecticut 040-049 Philippine Islands 581-585
New York 050-134 Railroad 700-729
New Jersey 135-158
Pennsylvania 159-211

202
INVALID SSNs
1. Ending in four zeros
2. Leading numbers 73 through 79
3. Leading number 6 or 8
4. Leading number 9 is suspect -very few ever issued
Spelled Speech
The International Civil Aviation Organization has a standard list of words used for
international
communication among pilots and air traffic controllers to substitute for letters and
digits when appropriate. The chosen words are easy to understand regardless of
accent. (The words in parentheses on the following chart are words used by the US
Military before the ICAO agreement was reached.)The ICAO words should be added
to any novice and technical word list. And of course, no brute force attack of a
military installation or aeronautics-related site would be complete without them.
Alpha/Alfa (Able) November (Nan)
Bravo (Baker) Oscar (Oboe)
Charlie Papa (Peter)
Delta (Dog) Quebec
Echo (Easy) Romeo (Roger)
Foxtrot (Fox) Sierra (Sugar)
Golf (George) Tango (Tare)
Hotel (How) Uniform (Uncle)
India (Item) Victor
Juliet (jig) Whisky (William)
Kilo (King) Xray
Lima (Love) Yankee(Yoke)
Mike Zulu (Zebra)
Numbers: Wun, Too, Thuh-ree, Fo-wer, Fi-yiv, Six, Seven, Ate, Niner, Zero.
203
Blank Page
204
Appendix H:
Additional R/SE
Role Playing Situations
• Classic social engineering excuse: "Hey, I forgot the password and this work has
got to get done. Can you help me out?"
• Call and ask for a naive user. Ask if they want to take a break from work for a
little bit. Say you want to test a new help system or tutorial that will help them
learn. Ask the user to shut down and login under some made-up password. When

it doesn't work, act surprised and say, "Gee, what do you normally do here?" Then
tell the user you'll fix it and call back later. You do: On your modem.
• Place fliers in the college computer room: "We need system managers
immediately! Looks good on resume! Name. Password We will upgrade you to
blah blah..." Or work this on, say" Psychology or Economics students tell them
there's a special project they can enroll in for credit or money.
• Send a memo out saying the dial-in number for a local BBS has changed. Set up
your own computer with a simulator. When they phone in and enter their login
data, instruct them that the original number is to be used for people in their area
code, and that they should re-dial.
• Call a system manager after an incident and say you are a legitimate user who
has been locked out, or who's had an account destroyed. (Do your research first,
and find the name of a legitimate user.) If software failure was involved with the
incident, you will want to talk to the software company and see if you can find out
what the bugs were and how they were exploited or repaired.
• Tag team. You are in your target's office with the account holder. An accomplice
makes a phone call, says he's the parking attendant calling from the garage. He
thinks the account holder's car was broken into.
The target leaves, and you are alone with the computer.
205
BLANK PAGE
SECRETS OF A SUPER HACKER
by The Knightmare
With an Introduction by Gareth Branwyn
This is the most amazing book on computer hacking we have ever seen! The
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Brute Force Attacks: Hurling passwords at a system until it cracks.
Social Engineering and Reverse Social Engineering: Seducing legitimate users into
revealing their passwords.
Spoofing: Designing dummy screens; Delivering fake e-mail.
Superuser Abuser: How to get system managers to do your dirty work for you!

Screen Stealing: How to secretly record every image that appears on a computer
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Data Delivery: How to hide the information you've collected; How to e-mail it to
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Stair Stepping: How to use a low-level account to gain ever-higher levels of access.
And Much More! Including a brief history of hacking, lists of likely passwords, and a
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