2020 FRSecure CISSP Mentor Program - Class 5

April 29, 2020
2020 CISSP
MENTOR PROGRAM
-----------
Class 5 – April 29, 2020
Instructor:
• Evan Francen, FRSecure & SecurityStudio CEO
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CISSP® MENTOR PROGRAM – SESSION FIVE
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FRSECURE CISSP MENTOR PROGRAM LIVE
STREAM
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Quick housekeeping reminder.
• The online/live chat that’s provided while live streaming on YouTube
is for constructive, respectful, and relevant (about course content)
discussion ONLY.
• At NO TIME is the online chat permitted to be used for disrespectful,
offensive, obscene, indecent, or profane remarks or content.
• Please do not comment about controversial subjects, and please NO
DISCUSSION OF POLITICS OR RELIGION.
• Failure to abide by the rules may result in disabling chat for you.
THANK YOU!
FRSECURE.COM/CISSP-MENTOR-PROGRAM

2
FRSECURE CISSP MENTOR PROGRAM ONLINE
STUDY GROUP
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If you haven’t done so already, and you’d like to participate, go
here to register:
https://groups.io/g/FRSecure2020CISSPMentorProgram

3
FRSECURE CISSP MENTOR PROGRAM ONLINE
STUDY GROUP
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If you haven’t done so already, and you’d like to participate, go
here to register:
https://groups.io/g/FRSecure2020CISSPMentorProgram
550 555 Members!

4
WE WANT YOUR FEEDBACK
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Today, SecurityStudio released version 2 of S²Me, and we want to
know what you think before general release.
https://s2me.io

How about a dumb dad joke?
5
INTRODUCTION
Before we get too deep into this.
Why did the picture go to jail?
Because it was framed!
Yeah, I know.
That’s dumb.
Let’s get to it…
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We’re through Chapters 1, 2, 3, and mostly through
Chapter 4!
• Check-in.
• How many have read Chapter 1, 2 & 3 (and maybe 4)?
• You had some time to catch-up, but if you’re in MN, you
might have been distracted by sun. Sun = Life (not
testable)
• Questions?
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KILLIN’ IT!
Hope you enjoyed your break! If we overwhelm today, we have a weekend
to cope.
We’re going to go fast tonight. We’ve got 166slides!
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QUIZ…
Easy peezy – We’ll be switching up questions from other sources soon.
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1. What model should you use if you are primarily
concerned with confidentiality of information?
A. Brewer-Nash
B. Bell-LaPadula
C. Biba
D. Clark-Wilson
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QUIZ…
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2. On Intel ×86 systems, the kernel normally runs in which
CPU ring?
A. Ring 0
B. Ring 1
C. Ring 2
D. Ring 3
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QUIZ…
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2. On Intel ×86 systems, the kernel normally runs in which
CPU ring?
A. Ring 0
B. Ring 1
C. Ring 2
D. Ring 3
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QUIZ…
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3. Which type of cloud service level would Linux hosting
be offered under?
A. IaaS
B. IDaaS
C. PaaS
D. SaaS
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QUIZ…
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3. Which type of cloud service level would Linux hosting
be offered under?
A. IaaS
B. IDaaS
C. PaaS
D. SaaS
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QUIZ…
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4. Nonrepudiation is best described as what?
A. Proving a user performed a transaction
B. Proving a transaction did not change
C. Authenticating a transaction
D. Proving a user performed a transaction that did not change
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QUIZ…
What?! We didn’t cover this in class yet?!
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4. Nonrepudiation is best described as what?
A. Proving a user performed a transaction
B. Proving a transaction did not change
C. Authenticating a transaction
D. Proving a user performed a transaction that did not change
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QUIZ…
True. We haven’t covered this in class yet.
You’ve been reading though, right?
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LET’S DO THIS!
Picking up where we left off.
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• Cornerstone Cryptographic Concepts
• History of Cryptography
• Types of Cryptography
• Cryptographic Attacks
• Implementing Cryptography
• Perimeter Defenses
• Site Selection, Design, and Configuration
• System Defenses
• Environmental Controls
Formerly separate domains: Security Architecture, Cryptography, and Physical Security
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WHAT ARE WE GOING TO COVER?
Agenda – Domain 3: Security Engineering
Starting on page 160 this evening
This is the last class for this domain! Then you breathe.
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• Uses one key to encrypt and decrypt
• Also called “Secret key” encryption
• Strengths include speed and cryptographic strength per bit of
key
• Major weakness is that the key must be securely shared before
two parties may communicate securely
• Keys are often shared via an out-of-band method
Stream and Block Ciphers
• Stream mode means each bit is independently encrypted in a
“stream.”
• Block mode ciphers encrypt blocks of data each round:
• 56 bits for the Data Encryption Standard (DES)
• 128, 192, or 256 bits for AES
• Some block ciphers can emulate stream ciphers by setting the
block size to 1 bit; they are still considered block ciphers.
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Symmetric Encryption
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Initialization Vectors and Chaining
• Initialization vector (or “IV”) is used in some
symmetric ciphers to ensure that the first encrypted
block of data is random.
• Ensures that identical plaintexts encrypt to different
ciphertexts
• Two messages that begin the same will encrypt the
same way up to the first difference. Some messages
have a common header: a letterhead, or a ‘From’ line, or
whatever.”
• Chaining (called feedback in stream modes) seeds the
previous encrypted block into the next block to be
encrypted
• Destroys patterns in the resulting ciphertext
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Initialization Vectors and Chaining
• Initialization vector (or “IV”) is used in some
symmetric ciphers to ensure that the first encrypted
block of data is random.
• Ensures that identical plaintexts encrypt to different
ciphertexts
• Two messages that begin the same will encrypt the
same way up to the first difference. Some messages
have a common header: a letterhead, or a ‘From’ line, or
whatever.”
• Chaining (called feedback in stream modes) seeds the
previous encrypted block into the next block to be
encrypted
• Destroys patterns in the resulting ciphertext
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Data Encryption Standard (DES)
• DES is the Data Encryption Standard
• Describes the Data Encryption Algorithm (DEA)
• Made a United States federal standard symmetric cipher in 1976
• Designed by IBM, based on their older Lucifer symmetric cipher
• Uses a 64-bit block size (meaning it encrypts 64 bits each round)
and a 56-bit key.
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Data Encryption Standard (DES) - Modes
• DES can use five different modes to encrypt data
• The modes’ primary difference is block versus (emulated) stream, the use of
initialization vectors, and whether errors in encryption will propagate to subsequent
blocks.
• The five modes of DES are:
• Electronic Code Book (ECB)
• Cipher Block Chaining (CBC)
• Cipher Feedback (CFB)
• Output Feedback (OFB)
• Counter Mode (CTR)
• ECB is the original mode of DES
• CBC, CFB, and OFB were later added in FIPS Publication 81 (see
http://www.itl.nist.gov/fipspubs/fip81.htm)
• CTR mode is the newest mode, described in NIST Special Publication 800-38a (see:
http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf)
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Notice the words “chaining”
and “feedback”
Block mode/Stream mode

Data Encryption Standard (DES) - Electronic Code Book
(ECB)
• The simplest and weakest form of DES
• No initialization vector or chaining
• Identical plaintexts with identical keys encrypt to identical
ciphertexts
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Lack of diffusion
Susceptible to replay
attacks.

Data Encryption Standard (DES) - Electronic Code Book
(ECB)
• The simplest and weakest form of DES
• No initialization vector or chaining
• Identical plaintexts with identical keys encrypt to identical
ciphertexts
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Lack of diffusion
Susceptible to replay
attacks.

Data Encryption Standard (DES) - Cipher Block Chaining
(CBC)
• A block mode of DES
• XORs the previous encrypted block of ciphertext to the next block
of plaintext to be encrypted
• First encrypted block is an initialization vector that contains
random data
• The “chaining” destroys patterns
• One limitation of CBC mode is that encryption errors will
propagate: an encryption error in one block will cascade through
subsequent blocks due to the chaining, destroying their integrity.
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Data Encryption Standard (DES) - Cipher Block Chaining
(CBC)
• A block mode of DES
• XORs the previous encrypted block of ciphertext to the next block
of plaintext to be encrypted
• First encrypted block is an initialization vector that contains
random data
• The “chaining” destroys patterns
• One limitation of CBC mode is that encryption errors will
propagate: an encryption error in one block will cascade through
subsequent blocks due to the chaining, destroying their integrity.
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Data Encryption Standard (DES) - Cipher Feedback (CFB)
• Very similar to CBC; the primary difference is CFB is a stream
mode
• Uses feedback (the name for chaining when used in stream
modes) to destroy patterns
• Like CBC, CFB uses an initialization vector and destroys patterns,
and errors propagate
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Data Encryption Standard (DES) - Output Feedback (OFB)
• Differs from CFB in the way feedback is accomplished
• CFB uses the previous ciphertext for feedback. The previous
ciphertext is the subkey XORed to the plaintext.
• OFB uses the subkey before it is XORed to the plaintext.
• Since the subkey is not affected by encryption errors, errors will
not propagate.
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Data Encryption Standard (DES) - Counter (CTR)
• Like OFB; the difference again is the feedback: CTRmode uses a
counter
• Shares the same advantages as OFB (patterns are destroyed and
errors do not propagate) with an additional advantage: since the
feedback can be as simple as an ascending number, CTR mode
encryption can be done in parallel
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Data Encryption Standard (DES) – Modes Comparison
Table
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MEMORIZE, OK?
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Data Encryption Standard (DES) – Single DES
• Original implementation of DES
• Encrypts 64-bit blocks of data with a 56-bit key, using 16 rounds
of encryption
• Work factor required to break DES was reasonable in 1976
• Massively parallel computers such as COPACOBANA (Cost-
Optimized Parallel COde Breaker, given as a nontestable example,
see: http://www.copacobana.org for more information), which
uses over 100 CPUs in parallel, can break 56-bit DES in a week or
so (and faster with more CPUs), at a cost of under $10,000.
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Today is less than 26
hours.

Data Encryption Standard (DES) – Single DES
• Original implementation of DES
• Encrypts 64-bit blocks of data with a 56-bit key, using 16 rounds
of encryption
• Work factor required to break DES was reasonable in 1976
• Massively parallel computers such as COPACOBANA (Cost-
Optimized Parallel COde Breaker, given as a nontestable example,
see: http://www.copacobana.org for more information), which
uses over 100 CPUs in parallel, can break 56-bit DES in a week or
so (and faster with more CPUs), at a cost of under $10,000.
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COOL SITE!
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Data Encryption Standard (DES) – Triple DES
• Applies single DES encryption three times per block
• Became a recommended standard in 1999 by the United States
Federal Information Processing Standard (FIPS) Publication 46-3
(see: http://csrc.nist.gov/publications/fips/fips46-3/fips46-
3.pdf)
• The primary weakness is that it is slow and complex compared
to newer symmetric algorithms such as AES or Twofish
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NOTE: “Double DES” (applying DES encryption
twice using two keys) is not used due to a
meet-in-the-middle attack
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FIPS Publication 46-3
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Data Encryption Standard (DES) – Triple DES encryption
order and keying options
• Applies DES encryption three times per block
• FIPS 46-3 describes “Encrypt, Decrypt, Encrypt” (EDE) order using
three keying options: one, two, or three unique keys (called
1TDES EDE, 2TDES EDE, and 3TDES EDE, respectively)
• Applying triple DES EDE with the same key each time results in
the same ciphertext as single DES
• 2TDES EDE uses key 1 to encrypt, key 2 to “decrypt,” and key 1 to
encrypt. This results in 112 bits of key length. It is commonly
used for legacy hardware applications with limited memory
• 3TDES EDE (three different keys) is the strongest form, with 168
bits of key length
• Two- and three-key TDES EDE remain a FIPS-approved standard
until 2030 (sort of)
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Data Encryption Standard (DES) – Triple DES encryption
order and keying options
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International Data Encryption Algorithm (IDEA)
• A symmetric block cipher designed as an international
replacement to DES
• Patented in many countries
• Uses a 128-bit key and 64-bit block size
• Held up to cryptanalysis
• Primary drawbacks are patent encumbrance and its slow speed
compared to newer symmetric ciphers such as AES
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Advanced Encryption Standard (AES)
• Current United States standard symmetric block cipher
• Federal Information Processing Standard (FIPS) 197 (see:
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf)
• Uses 128-bit (with 10 rounds of encryption), 192-bit (12 rounds of
encryption), or 256-bit (14 rounds of encryption) keys to encrypt
128-bit blocks of data
• Open algorithm, free to use, and free of any intellectual property
restrictions
• Designed to replace DES
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Advanced Encryption Standard (AES) - Choosing AES
• National Institute of Standards and Technology (NIST) solicited
input on a replacement for DES in the Federal Register in January
1997
• Fifteen AES candidates were announced in August 1998
• List was reduced to five in August 1999
• Rijndael was chosen and became AES
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Pioneering names in encryption

Advanced Encryption Standard (AES) - AES functions
• AES has four functions:
• SubBytes
• ShiftRows
• MixColumns
• AddRoundKey
• Operates on data called a “State” – 4 rows of 4 16
byte blocks
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Advanced Encryption Standard (AES) - AES functions -
SubBytes
• Provides confusion by substituting the bytes of the State
• Bytes are substituted according to a substitution table (also
called an S-Box)
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ShiftRows
• Provides diffusion by shifting rows of the State (block of data
that is being encrypted via AES)
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MixColumns
• Provides diffusion by “mixing” the columns of the State via finite
field mathematics
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AddRoundKey
• Final function applied in each round
• XORs the State with the subkey
• Subkey is derived from the key, and is different for each round of
AES
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Blowfish and Twofish
• Symmetric block ciphers created by teams lead by Bruce
Schneier
• Blowfish uses from 32 through 448 bit (the default is 128) keys
to encrypt 64 bits of data
• Twofish was an AES finalist, encrypting 128-bit blocks using 128
through 256 bit keys
• Both are open algorithms, unpatented and freely available
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Schneier
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Schneier
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RC5 and RC6
• Symmetric block ciphers by RSA Laboratories
• RC5 uses 32 (testing purposes), 64 (replacement for DES), or
128-bit blocks. The key size ranges from zero to 2040 bits.
• RC6 was an AES finalist. It is based on RC5, altered to meet the
AES requirements. It is also stronger than RC5, encrypting 128-bit
blocks using 128-, 192-, or 256-bit keys.
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Think you got symmetric encryption down?
Now, assymetric…
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• Solves the age-old challenge of preshared keys
• Whitfield Diffie and Martin Hellman, who created the Diffie-
Hellman key exchange in 1976
• RSA algorithm was invented in 1977 (RSA stands for “Rivest,
Shamir, and Adleman,” the authors’ names)
• Uses two keys: if you encrypt with one key, you may decrypt with
the other
• Also called public key encryption
• Public – Private key pair
• Math lies behind the asymmetric encryption - methods use “one-
way functions,” which are easy to compute “one way,” and
difficult to compute in the reverse direction.
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Asymmetric Encryption
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• Solves the age-old challenge of preshared keys
• Whitfield Diffie and Martin Hellman, who created the Diffie-
Hellman key exchange in 1976
• RSA algorithm was invented in 1977 (RSA stands for “Rivest,
Shamir, and Adleman,” the authors’ names)
• Uses two keys: if you encrypt with one key, you may decrypt with
the other
• Also called public key encryption
• Public – Private key pair
• Math lies behind the asymmetric encryption - methods use “one-
way functions,” which are easy to compute “one way,” and
difficult to compute in the reverse direction.
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Methods (there are two primary ones)
Math lies behind the asymmetric encryption - methods use “one-way functions,” which
are easy to compute “one way,” and difficult to compute in the reverse direction.
Factoring Prime Numbers
• Factoring a composite number into its primes
• Prime number is a number evenly divisible only by one and itself
• Composite number is evenly divisible by numbers other than 1 and itself.
• Multiplying the prime number 6269 by the prime number 7883 results in the
composite number 49,418,527. That “way” is quite easy to compute, taking
milliseconds on a calculator. Answering the question “which prime number times
which prime number equals 49,418,527” is much more difficult.
• The problem is called factoring, and no shortcut has been found for hundreds of
years
• Basis of the RSA algorithm
• Factoring a large composite number (one thousands of bits long) is so difficult
that the composite number can be safely publicly posted (this is the public key).
• The primes that are multiplied to create the public key must be kept private (they
are the private key).
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Methods (there are two primary ones)
Math lies behind the asymmetric encryption - methods use “one-way functions,” which
are easy to compute “one way,” and difficult to compute in the reverse direction.
Discrete Logarithm
• A logarithm is the opposite of exponentiation
• Computing 7 to the 13th power (exponentiation) is easy on a modern calculator:
96,889,010,407. Asking the question “96,889,010,407 is 7 to what power” (finding
the logarithm) is more difficult
• Basis of the Diffie-Helmann and ElGamal asymmetric algorithms
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Diffie-Hellman key agreement protocol
• Allows two parties to securely agree on a symmetric key via a
public channel
• Also called the Diffie-Hellman Key Exchange
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Elliptic Curve Cryptography (ECC)
• One-way function that uses discrete logarithms as applied to
elliptic curves
• Solving this problem is harder than solving discrete logarithms,
so algorithms based on Elliptic Curve Cryptography (ECC) are
much stronger per bit than systems using discrete logarithms
(and also stronger than factoring prime numbers)
• Requires less computational resources because shorter keys
can be used compared to other asymmetric methods
• Often used in lower power devices
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Asymmetric and Symmetric Tradeoffs
• Asymmetric encryption is far slower than symmetric encryption
• Asymmetric encryption is weaker per bit of key length
• Asymmetric and symmetric encryption are typically used
together: use an asymmetric algorithm such as RSA to securely
send someone an AES (symmetric) key
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• Provides encryption using an algorithm and no key
• Called “one-way hash functions” because there is no way to
reverse the encryption
• A variable-length plaintext is “hashed” into a fixed-length hash
value (often called a “message digest” or a “hash”)
• Primarily used to provide integrity: if the hash of a plaintext
changes, the plaintext itself has changed
• Older hash functions include Secure Hash Algorithm 1 (SHA-1),
which creates a 160-bit hash and Message Digest 5 (MD5),
which creates a 128-bit hash
• Newer alternatives such as SHA-2 are recommended
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Hash Functions
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Collisions
• Hashes are not unique, because the number of possible
plaintexts is far larger than the number of possible hashes
• More than one document could have the same hash: this is
called a collision
• Collisions are always possible (assuming the plaintext is longer
than the hash), they should be very difficult to find
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Hash Functions
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MD5
• Message Digest algorithm 5, created by Ronald Rivest
• Creates a 128-bit hash value based on any input length
• Weaknesses have been discovered where collisions could be
found in a practical amount of time
• MD6 is the newest version of the MD family of hash algorithms,
first published in 2008
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Hash Functions
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Secure Hash Algorithm (SHA)
• Name of a series of hash algorithms
• SHA-1 was announced in 1993 in the United States Federal
Information Processing Standard 180 (see
http://www.itl.nist.gov/fipspubs/fip180-1.htm)
• SHA-1 creates a 160-bit hash value
• SHA-2 is recommended over SHA-1 or MD5
• The SHA-3 competition was announced in the Federal Register in
2007; SHA-3 was announced as a standard in the Fall of 2015 -
Keccak algorithm (http://csrc.nist.gov/publications/drafts/fips-
202/fips_202_draft.pdf)
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Hash Functions
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HAVAL
• Hash of Variable Length
• Creates message digests of 128, 160, 192, 224, or 256 bits in
length, using 3, 4, or 5 rounds
• Uses some of the design principles behind the MD family of hash
algorithms, and is faster than MD5
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Hash Functions
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HAVAL
• Hash of Variable Length
• Creates message digests of 128, 160, 192, 224, or 256 bits in
length, using 3, 4, or 5 rounds
• Uses some of the design principles behind the MD family of hash
algorithms, and is faster than MD5
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Hash Functions
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Used by cryptanalysts to recover the plaintext without the key or to
recover the key itself
Brute Force
• Generates the entire keyspace, which is every possible key
• Given enough time, the plaintext will be recovered
• Effective attack against all key-based ciphers, except for the one-
time pad
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Cryptographic Attacks
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Known Plaintext
• Relies on recovering and analyzing a matching plaintext and
ciphertext pair
• The goal is to derive the key which was used
Chosen Plaintext and Adaptive Chosen Plaintext
• Cryptanalyst chooses the plaintext to be encrypted
• Goal is to derive the key
• Adaptive-chosen plaintext begins with a chosen plaintext attack
in round 1. The cryptanalyst then “adapts” further rounds of
encryption based on the previous round
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Chosen Ciphertext and Adaptive Chosen
Ciphertext
• Mirror chosen plaintext attacks: the difference is that the
cryptanalyst chooses the ciphertext to be decrypted
• Usually launched against asymmetric cryptosystems
Meet-in-the-middle Attack
• Meet-in-the-middle attack encrypts on one side, decrypts on the
other side, and meets in the middle
• Common attack is against “double DES”
• Attack is a known plaintext attack: the attacker has a copy of a
matching plaintext and ciphertext, and seeks to recover the two
keys used to encrypt.
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Known Key
• Known key means the cryptanalyst knows something about the
key, to reduce the efforts used to attack it.
• If the cryptanalyst knows that the key is an uppercase letter and
a number only, other characters may be omitted in the attack.
Differential Cryptanalysis
• Seeks to find the “difference” between related plaintexts that are
encrypted
• Usually launched as an adaptive chosen plaintext attack
• The cryptanalyst uses statistical analysis to search for signs of
nonrandomness in the ciphertexts
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Linear Cryptanalysis
• A known plaintext attack where the cryptanalyst finds large
amounts of plaintext/ciphertext pairs created with the same key
• The pairs are studied to derive information about the key used to
create them
Side-channel Attacks
Use physical data to break a cryptosystem, such as monitoring CPU
cycles or power consumption used while encrypting or decrypting
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Birthday Attack
• Named after the birthday paradox
• Based on fact that in a room with 23 people or more, the odds
are greater than 50% that two will share the same birthday
• The birthday paradox illustrates why many people’s instinct on
probability (and risk) is wrong. You are not trying to match a
specific birthday (such as yours); you are trying to match any
birthday.
• Used to create hash collisions
Key Clustering
Occurs when two different symmetric keys applied to the same
plaintext produce the same ciphertext
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Digital Signatures
• Used to cryptographically sign documents
• Provide nonrepudiation, which includes authentication of the
identity of the signer, and proof of the document’s integrity
(proving the document did not change)
• Use a hash function to generate a hash value of the plaintext
• Create the digital signature by encrypting the hash with a private
key
• Digital signatures provide authentication and integrity, which
forms nonrepudiation. They do not provide confidentiality: the
plaintext remains unencrypted.
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Implementing Cryptography
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Digital Signatures
• Used to cryptographically sign documents
• Provide nonrepudiation, which includes authentication of the
identity of the signer, and proof of the document’s integrity
(proving the document did not change)
• Use a hash function to generate a hash value of the plaintext
• Create the digital signature by encrypting the hash with a private
key
• Digital signatures provide authentication and integrity, which
forms nonrepudiation. They do not provide confidentiality: the
plaintext remains unencrypted.
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HMAC
• Combines symmetric encryption with hashing
• Similar to a digital signature, except that it uses symmetric
encryption instead of asymmetric
• HMACs are used by IPsec
• Two parties must preshare a secret key (such as a DES key).
Once shared, the sender may generate a HMAC by hashing the
message with an algorithm such as MD5 or SHA-1, and then
encrypting the hash with the preshared key via symmetric cipher
such as DES
• The receiver hashes the plaintext locally and also decrypts the
HMAC with his/her copy of the private key, recovering the
sender’s hash. If the two hashes match, the sender is
authenticated, and the message’s integrity is assured.
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Public Key Infrastructure (PKI)
• Leverages all three forms of encryption to provide and manage
digital certificates
• A digital certificate is a public key signed with a digital signature
• Digital certificates may be server-based (used for SSL Web sites
such as https://www.ebay.com, for example) or client-based
(bound to a person).
• If the two are used together, they provide mutual authentication
and encryption.
• The standard digital certificate format is X.509.
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Public Key Infrastructure (PKI)
Certificate Authorities
• Digital certificates are issued by Certificate Authorities (CAs)
• Authenticate the identity of a person or organization before
issuing a certificate to them
• CAs may be private (run internally) or public (such as Verisign or
Thawte)
Certificate Revocation Lists
• Certificate Authorities maintain Certificate Revocation Lists
(CRL)
• List certificates that have been revoked
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#MissionBeforeMoney

IPSec
• Suite of protocols that provide a cryptographic layer to both IPv4
and IPv6
• One of the methods used to provide Virtual Private Networks
(VPN)
• Includes two primary protocols:
• Authentication Header (AH) and
• Encapsulating Security Payload (ESP).
• AH and ESP provide different, and sometimes overlapping
functionality
• Supporting IPsec protocols include Internet Security Association
and Key Management Protocol (ISAKMP) and Internet Key
Exchange (IKE)
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LECTURE
#MissionBeforeMoney

IPSec
AH and ESP
• Authentication Header provides authentication and integrity for
each packet of network data
• AH provides no confidentiality; it acts as a digital signature for
the data
• AH also protects against replay attacks
• Encapsulating Security Payload primarily provides confidentiality
by encrypting packet data
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LECTURE
#MissionBeforeMoney

IPSec
AH and ESP
• Authentication Header provides authentication and integrity for
each packet of network data
• AH provides no confidentiality; it acts as a digital signature for
the data
• AH also protects against replay attacks
• Encapsulating Security Payload primarily provides confidentiality
by encrypting packet data
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LECTURE
#MissionBeforeMoney

IPSec
Security Association and ISAKMP
• An IPsec Security Association (SA) is a simplex (one-way)
connection which may be used to negotiate ESP or AH
parameters
• If two systems communicate via ESP, they use two SAs (one for
each direction). If the systems leverage AH in addition to ESP,
they use two more SAs, for a total of four
• Each simplex SA connection is identified by a unique 32-bit
number called the Security Parameter Index (SPI)
• The SA process is managed by the Internet Security Association
and Key Management Protocol (ISAKMP)
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LECTURE
#MissionBeforeMoney

IPSec
Tunnel and Transport Mode
• IPsec can be used in tunnel mode or transport mode
• Tunnel mode is used by security gateways (which can provide
point-to-point IPsec tunnels)
• ESP Tunnel mode encrypts the entire packet, including the
original packet headers
• ESP Transport mode only encrypts the data (and not the original
headers); this is commonly used when the sending and receiving
system can “speak” IPsec natively
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LECTURE
#MissionBeforeMoney

IPSec
Tunnel and Transport Mode
• IPsec can be used in tunnel mode or transport mode
• Tunnel mode is used by security gateways (which can provide
point-to-point IPsec tunnels)
• ESP Tunnel mode encrypts the entire packet, including the
original packet headers
• ESP Transport mode only encrypts the data (and not the original
headers); this is commonly used when the sending and receiving
system can “speak” IPsec natively
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LECTURE
#MissionBeforeMoney

IPSec
IKE
• IPsec can use a variety of encryption algorithms, such as MD5 or
SHA-1 for integrity, and triple DES or AES for confidentiality
• The algorithm selection process is negotiated by the Internet Key
Exchange
• Two sides of an IPsec tunnel will typically use IKE to negotiate to
the highest and fastest level of security, selecting AES over
single DES for confidentiality if both sides support AES, for
example
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LECTURE
#MissionBeforeMoney

SSL and TLS
• SSL authenticates and provides confidentiality to Web traffic
• Transport Layer Security (TLS) is the successor to SSL
• SSL and TLS are commonly used as part of HTTPS (Hypertext Transfer Protocol
Secure)
• When you connect to a Web site such as https://www.isc2.org/, the data is
encrypted. This is true even if you have not preshared a key: the data is encrypted
out of the gate. This is done via asymmetric encryption: your browser downloads
the digital certificate of www.isc2.org, which includes the site’s public key, signed
by the Certificate Authority’s private key. If your browser trusts the CA (such as
Verisign), then this signature authenticates the site: you know its isc2.org and not
a rogue site. Your browser then uses that public key to securely exchange a
symmetric session key. The private key is stored on the isc2.org Web server,
which allows it to decrypt anything encrypted with the public key. The symmetric
key is then used to encrypt the rest of the session.
• SSL was developed for the Netscape Web browser in the 1990s. SSL 2.0 was the
first released version; SSL 3.0 fixed a number of security issues with version 2.
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LECTURE
#MissionBeforeMoney

SSL and TLS
• SSL authenticates and provides confidentiality to Web traffic
• Transport Layer Security (TLS) is the successor to SSL
• SSL and TLS are commonly used as part of HTTPS (Hypertext Transfer Protocol
Secure)
• When you connect to a Web site such as https://www.isc2.org/, the data is
encrypted. This is true even if you have not preshared a key: the data is encrypted
out of the gate. This is done via asymmetric encryption: your browser downloads
the digital certificate of www.isc2.org, which includes the site’s public key, signed
by the Certificate Authority’s private key. If your browser trusts the CA (such as
Verisign), then this signature authenticates the site: you know its isc2.org and not
a rogue site. Your browser then uses that public key to securely exchange a
symmetric session key. The private key is stored on the isc2.org Web server,
which allows it to decrypt anything encrypted with the public key. The symmetric
key is then used to encrypt the rest of the session.
• SSL was developed for the Netscape Web browser in the 1990s. SSL 2.0 was the
first released version; SSL 3.0 fixed a number of security issues with version 2.
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LECTURE
Secure Sockets Layer (SSL) is deprecated.
TLS 1.3 is current, released in RFC 8446
(August 2018). There were many security
changes and updates from TLS 1.2.
#MissionBeforeMoney

PGP
• Pretty Good Privacy – Asymmetric Encryption
• Released by Phil Zimmerman in 1991
• Uses a Web of trust model to authenticate digital certificates,
instead of relying on a central certificate authority (CA) - If you
trust that my digital certificate authenticates my identity, the Web
of trust means you trust all the digital certificates that I trust.
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LECTURE
#MissionBeforeMoney

S/MIME
• MIME (Multipurpose Internet Mail Extensions)
• S/MIME (Secure/MIME) leverages PKI to encrypt and
authenticate MIME-encoded email
• Encryption may be done by the client or client’s email server
(called an S/MIME gateway)
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#MissionBeforeMoney

Escrowed Encryption
• Takes a private key and divides it into two or more parts
• The parts are held in escrow by different trusted third-party
organizations, which will only release their portion of the key with
proper authorization, such as a court order
• Balance between an individual’s privacy, and the needs of law
enforcement
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LECTURE
#MissionBeforeMoney

Clipper Chip
• The name of the technology used in the Escrowed Encryption
Standard (EES)
• Announced in 1993 by the United States government to deploy
escrowed encryption in telecommunications devices
• Created a media firestorm, and was abandoned by 1996
• Used the Skipjack algorithm, a symmetric cipher that uses an 80-
bit key, an algorithm that was originally classified as secret
• Skipjack was later declassified in 1998
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LECTURE
OOPS!
#MissionBeforeMoney

Steganography
• Steganography is the science of hidden communication
• Hides the fact that communication is taking place
• The first use of steganography was documented by the ancient
Greek historian Herodotus in the Histories of Herodotus.
Herodotus described shaving a slave’s head, tattooing
instructions on it, waiting for the hair to grow back, and sending
the slave across enemy lines.
• Modern steganography hides information inside data files, such
as images
• Messages that are hidden via steganography are often encrypted
first, providing both confidentiality of the data and secrecy of the
communication
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LECTURE
#MissionBeforeMoney

Steganography
• Steganography is the science of hidden communication
• Hides the fact that communication is taking place
• The first use of steganography was documented by the ancient
Greek historian Herodotus in the Histories of Herodotus.
Herodotus described shaving a slave’s head, tattooing
instructions on it, waiting for the hair to grow back, and sending
the slave across enemy lines.
• Modern steganography hides information inside data files, such
as images
• Messages that are hidden via steganography are often encrypted
first, providing both confidentiality of the data and secrecy of the
communication
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#MissionBeforeMoney

Digital Watermarks
• Digital Watermarks encode data into a file
• The watermark may be hidden, using steganography
• Good story from the book…
An example of real-world digital watermark use is the watermarking of DVDs by the Academy of
Motion Picture Arts and Sciences. Members of the academy (who decide the recipients of Oscar
awards) receive DVD “screeners” of nominated films. The films are often still being shown in movie
theaters and not yet available on DVD (publicly). When the DVD system was first implemented,
illegal copies of the screeners would appear on peer-to-peer filesharing networks. These copies
were “ripped” (digitally copied) from the screeners. In response, the Academy of Motion Picture
Arts and Sciences began watermarking each screener. Each DVD is customized for the recipient:
every frame of every DVD contains a hidden watermark, tying the DVD to the recipient. Should the
DVD appear on a P2P network, the academy can track the copy down the source DVD (and member
who received it). In 2007, Salvador Nunez Jr. was arrested for posting the movie Flushed Away
online, copied from an academy screener. Investigators used the watermark to track the copy to a
screener received by his sister, who was a member of the academy.
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#MissionBeforeMoney

We’re done with Encryption!
Now onto Physical Security…
Remember our definition of information security:
The application of administrative, physical, and technical
controls to protect the confidentiality, integrity, and
availability of information.
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LECTURE
Thank God!
#MissionBeforeMoney

• Mantrap - A preventive physical control with two
doors. Each door requires a separate form of
authentication to open
• Bollard—A post designed to stop a car, typically
deployed in front of building entrances
• Smart card—A physical access control device
containing an integrated circuit
• Tailgating—Following an authorized person into a
building without providing credentials
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Physical Security – Unique Terms and Definitions
A card with a high IQ?
#MissionBeforeMoney

Introduction
• Physical assets: people, buildings, systems, and data
• CISSP® exam considers human safety as the most critical
concern of this domain - trumps all other concerns
• Physical security protects against threats such as unauthorized
access and disasters, both man-made and natural
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Physical Security
#MissionBeforeMoney

Perimeter Defenses
• Help prevent, detect, and correct unauthorized physical access
• Should employ defense-in-depth
• Fences, doors, walls, locks, etc.
Fences
• May range from deterrents (such as 3-foot/1 meter-tall fencing)
to preventive devices (8-foot/2.4 meter)
• Should be designed to steer ingress and egress to controlled
points, such as exterior doors and gates
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Physical Security
#MissionBeforeMoney

Gates
• Range in strength from ornamental (a class I gate designed to deter
access) to a class IV gate designed to prevent a car from crashing
through (such as gates at airports and prisons)
• ASTM International's “ASTM F2200” Standard Specification for
Automated Vehicular Gate Construction at
http://www.astm.org/Standards/F2200.htm
• Types of Vehicle Gates:
• Class I Residential (home use)
• Class II Commercial/General Access (parking garage)
• Class III Industrial/Limited Access (loading dock for 18-wheeler
trucks)
• Class IV Restricted Access (airport or prison)
• Gates should be placed at controlled points at the perimeter - Secure
sites use fences and topography to steer traffic to these points.
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Physical Security
#MissionBeforeMoney

Gates
• Range in strength from ornamental (a class I gate designed to deter
access) to a class IV gate designed to prevent a car from crashing
through (such as gates at airports and prisons)
• ASTM International's “ASTM F2200” Standard Specification for
Automated Vehicular Gate Construction at
http://www.astm.org/Standards/F2200.htm
• Types of Vehicle Gates:
• Class I Residential (home use)
• Class II Commercial/General Access (parking garage)
• Class III Industrial/Limited Access (loading dock for 18-wheeler
trucks)
• Class IV Restricted Access (airport or prison)
• Gates should be placed at controlled points at the perimeter - Secure
sites use fences and topography to steer traffic to these points.
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Physical Security
#MissionBeforeMoney

Bollards
• A traffic bollard is a strong post designed to stop a car
• Term derives from the short/strong posts (called mooring
bollards) used to tie ships to piers when docked
• Often installed in front of convenience stores, to prevent a
confused driver who mixes up the accelerator and brake from
driving into the store.
• Used in secure facilities to prevent cars from entering (whether
intentionally or not)
• Can use large concrete planters for the same effect
• Usually placed in front of physically weak areas of a building,
such as entryways
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Physical Security
#MissionBeforeMoney

Bollards
• A traffic bollard is a strong post designed to stop a car
• Term derives from the short/strong posts (called mooring
bollards) used to tie ships to piers when docked
• Often installed in front of convenience stores, to prevent a
confused driver who mixes up the accelerator and brake from
driving into the store.
• Used in secure facilities to prevent cars from entering (whether
intentionally or not)
• Can use large concrete planters for the same effect
• Usually placed in front of physically weak areas of a building,
such as entryways
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Physical Security
#MissionBeforeMoney

Lights
• Can act as both a detective and deterrent control
• Criminals will usually favor a poorly lighted target over a more
visible one
• Should be bright enough to illuminate the desired field of vision
(the area being protected)
• Fresnel (pronounced fray-NELL) lights - Same type originally used
in lighthouses, use Fresnel lenses to aim light in a specific
direction
• Light measurement:
• Lumen, the amount of light one candle creates
• Footcandles; one footcandle is one lumen per square foot
• Lux, based on the metric system, more commonly used now:
one lux is one lumen per square meter.
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Physical Security
#MissionBeforeMoney

CCTV
• Closed Circuit Television (CCTV)
• Detective device used to aid in detecting the presence of
intruders in restricted areas
• Can also be used as a deterrent device/control
• CCTVs using the normal light spectrum require sufficient
visibility to illuminate the field of view
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Physical Security
Are cloud-enabled surveillance cameras considered CCTV?
#MissionBeforeMoney

CCTV
• Infrared devices can “see in the dark” by displaying heat
• Older “tube cameras” are analog devices
• Modern cameras use CCD (Charged Couple Discharge), which is
digital
• Cameras have mechanical irises that act as human irises,
controlling the amount of light that enters the lens by changing
the size of the aperture
• Key issues include depth of field (the area that is in focus) and
field of view (the entire area viewed by the camera)
• More light allows a larger depth of field because a smaller
aperture places more of the image in focus
• A wide aperture (used in lower light conditions) lowers the depth
of field
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Physical Security
#MissionBeforeMoney

CCTV
• Features such as pan and tilt (moving horizontally and vertically)
• Displays may display:
• Fixed camera view
• Autoscan (show a given camera for a few seconds before
moving to the next)
• Multiplexing (where multiple camera feeds are fed into one
display)
• Magnetic tape such as VHS is used to back up images from tube
cameras
• CCD cameras use DVR (Digital Video Recorder) or NVR (Network
Video Recorder) for backups
• NVR has the advantage of allowing centralized storage of all
video data
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Physical Security
#MissionBeforeMoney

CCTV
• Features such as pan and tilt (moving horizontally and vertically)
• Displays may display:
• Fixed camera view
• Autoscan (show a given camera for a few seconds before
moving to the next)
• Multiplexing (where multiple camera feeds are fed into one
display)
• Magnetic tape such as VHS is used to back up images from tube
cameras
• CCD cameras use DVR (Digital Video Recorder) or NVR (Network
Video Recorder) for backups
• NVR has the advantage of allowing centralized storage of all
video data
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Physical Security
#MissionBeforeMoney

Locks
• Preventive physical security control
• Used on doors and windows to prevent unauthorized physical
access
• May be mechanical, such as key locks or combination locks
• May be electronic - often used with smart cards or magnetic
stripe cards
Key locks
• Require a physical key to unlock
• Keys may be shared or sometimes copied, which lowers the
accountability of key locks
• A common type is the pin tumbler lock, which has two sets of pins:
driver pins and key pins.
• The correct key makes the pins line up with the shear line, allowing the
lock tumbler (plug) to turn
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Physical Security
#MissionBeforeMoney

Key locks
• Using an incorrect key results in misaligned pins, jamming the
lock plug
• Ward or Warded locks must turn a key through channels (called
wards); a “skeleton key” is designed to open varieties of warded
locks
• A spring-bolt lock is a locking mechanism which “springs” in and
out of the door jamb
• The door may be closed with the spring bolt exposed
• A deadbolt is rigid; the door cannot be closed when the deadbolt
is unlocked
• Both spring-bolt and deadbolts extend into the strike plate in the
door jamb
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Physical Security
#MissionBeforeMoney

Key locks
• Using an incorrect key results in misaligned pins, jamming the
lock plug
• Ward or Warded locks must turn a key through channels (called
wards); a “skeleton key” is designed to open varieties of warded
locks
• A spring-bolt lock is a locking mechanism which “springs” in and
out of the door jamb
• The door may be closed with the spring bolt exposed
• A deadbolt is rigid; the door cannot be closed when the deadbolt
is unlocked
• Both spring-bolt and deadbolts extend into the strike plate in the
door jamb
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Physical Security
#MissionBeforeMoney

Lock Picking
• The art of opening a lock without a key
• A set of lock picks can be used to lift the pins in a pin tumbler
lock, allowing the attacker to open the lock without a key
• A technique called lock bumping uses a shaved-down key which
will physically fit into the lock. The attacker inserts the shaved
key and “bumps” the exposed portion (sometimes with the
handle of a screwdriver). This causes the pins to jump, and the
attacker quickly turns the key and opens the lock.
• All key locks can be picked or bumped: the only question is how
long it will take
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Physical Security
#MissionBeforeMoney

Master and Core Keys
• Opens any lock for a given security zone in a building
• Access to the master key should be tightly controlled
• Core keys are used to remove the lock core in interchangeable
core locks (where the lock core may be easily removed and
replaced with another core)
• Once the lock core is removed, the door may often be
opened with a screwdriver
• Functional equivalent to the master key, core keys should
be kept equally secure
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Physical Security
#MissionBeforeMoney

Combination Locks
• Have dials that must be turned to specific numbers, in a specific order
(alternating clockwise and counterclockwise turns) to unlock
• A weak form of physical access control for production environments
such as data centers
• Button or keypad locks also use numeric combinations
• Limited accountability due to shared combinations
• Button or keypad locks are also vulnerable because prolonged use can
cause wear on the most used buttons or keys
• Combinations may be discovered via a brute-force attack, where every
possible combination is attempted
• Locks may also be compromised via shoulder surfing
• Simple locks such as pushbutton locks with limited combinations do not
qualify as preventive devices; they are deterrent ONLY
• Can be used for low-security applications such as locking an employee
restroom, but should not be used to protect sensitive data or assets
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Physical Security
#MissionBeforeMoney

Smart Cards and Magnetic Stripe Cards
• A physical access control device which is often used for
electronic locks, credit card purchases, or dual-factor
authentication systems
• “Smart” means the card contains a computer circuit
• Smart card is also known as “Integrated Circuit Card” (ICC).
• May be “contact” or “contactless”
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Physical Security
#MissionBeforeMoney

• Contact cards must be inserted into a smart card reader
• Contactless cards are read wirelessly
• One type of contactless card technology is Radio-Frequency
Identification (RFID)
• Contain RFID tags (also called transponders) which are read by
RFID transceivers
• Magnetic stripe card contains a magnetic stripe which stores
information
• Passive devices that contain no circuits
• Sometimes called swipe cards: they are used by swiping
through a card reader
• Many international credit cards are smart cards, while magnetic
stripe cards are more commonly used as credit cards in the
United States
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Physical Security
#MissionBeforeMoney

• Contact cards must be inserted into a smart card reader
• Contactless cards are read wirelessly
• One type of contactless card technology is Radio-Frequency
Identification (RFID)
• Contain RFID tags (also called transponders) which are read by
RFID transceivers
• Magnetic stripe card contains a magnetic stripe which stores
information
• Passive devices that contain no circuits
• Sometimes called swipe cards: they are used by swiping
through a card reader
• Many international credit cards are smart cards, while magnetic
stripe cards are more commonly used as credit cards in the
United States
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Physical Security
#MissionBeforeMoney

• The “Common Access Card” (CAC) is an example of a worldwide
smart card deployment by the U.S. Department of Defense (DoD)
• Used for physical access control, to provide dual-factor
authentication to critical systems, to digitally sign documents,
and others
• CAC cards store data including cryptographic certificates as part
of the DoD's Public Key Infrastructure (PKI)
• Both smart and magnetic stripe may be used in combination with
electronic locks to provide physical access control
• Better accountability when compared with mechanical locks:
audit data can be collected electronically
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Physical Security
#MissionBeforeMoney

• The “Common Access Card” (CAC) is an example of a worldwide
smart card deployment by the U.S. Department of Defense (DoD)
• Used for physical access control, to provide dual-factor
authentication to critical systems, to digitally sign documents,
and others
• CAC cards store data including cryptographic certificates as part
of the DoD's Public Key Infrastructure (PKI)
• Both smart and magnetic stripe may be used in combination with
electronic locks to provide physical access control
• Better accountability when compared with mechanical locks:
audit data can be collected electronically
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Physical Security
#MissionBeforeMoney

Tailgating/piggybacking
• Occurs when an unauthorized person follows an authorized
person into a building after the authorized person unlocks and
opens the door
• Policy should forbid employees from allowing tailgating and
security awareness efforts
• Attackers attempting to tailgate often combine social
engineering techniques, such as carrying large boxes, increasing
the chances an authorized user will “help out” by holding the door
open
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Physical Security
#MissionBeforeMoney

Tailgating/piggybacking
• Occurs when an unauthorized person follows an authorized
person into a building after the authorized person unlocks and
opens the door
• Policy should forbid employees from allowing tailgating and
security awareness efforts
• Attackers attempting to tailgate often combine social
engineering techniques, such as carrying large boxes, increasing
the chances an authorized user will “help out” by holding the door
open
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Physical Security
#MissionBeforeMoney

Mantraps and Turnstiles
• Mantraps are a preventive physical control with two doors
• The first door must close and lock before the second door may be
opened
• Each door typically requires a separate form of authentication to open
• The intruder is trapped between the doors after entering the mantrap
• Turnstiles are designed to prevent tailgating by enforcing a “one person
per authentication” rule
• Secure data centers may use floor-to-ceiling turnstiles with interlocking
blades to prevent an attacker from going over or under the turnstile
• Both mantraps and turnstiles must be designed to allow safe egress in
case of emergency
• No system should require authentication for egress during emergencies
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Physical Security
#MissionBeforeMoney

Contraband Checks
• Seek to identify objects that are prohibited to enter a secure
perimeter (such as an airplane)
• Secure buildings such as government or military buildings may
employ contraband checks
• Often used to detect metals, weapons, or explosives
• May also be used to detect controlled substances such as illegal
drugs, portable cameras or storage media
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Physical Security
#MissionBeforeMoney

Motion Detectors and Other Perimeter Alarms
• Ultrasonic and microwave motion detectors work like “Doppler
radar” used to predict the weather
• A wave of energy is sent out, and the “echo” is returned
when it bounces off an object
• A motion detector that is 20 ft away from a wall will
consistently receive an echo in the time it takes for the
wave to hit the wall and bounce back to the receiver, for
example. The echo will be returned more quickly when a
new object (such as a person walking in range of the
sensor) reflects the wave
• Active sensors - means they actively send energy
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Physical Security
#MissionBeforeMoney

• A photoelectric motion sensor sends a beam of light across a
monitored space to a photoelectric sensor
• The sensor alerts when the light beam is broken
• Also an active sensor
• A passive sensor is a “read-only” device; example is a passive
infrared (PIR) sensor that detects infrared energy created by
body heat.
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Physical Security
#MissionBeforeMoney

• A photoelectric motion sensor sends a beam of light across a
monitored space to a photoelectric sensor
• The sensor alerts when the light beam is broken
• Also an active sensor
• A passive sensor is a “read-only” device; example is a passive
infrared (PIR) sensor that detects infrared energy created by
body heat.
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Physical Security
#MissionBeforeMoney

• Perimeter alarms include magnetic door and window alarms
• Include matched pairs of sensors on the wall, as well as
window/door
• An electrical circuit flows through the sensor pairs as
long as the door or window is closed; the circuit breaks
when either is opened
• Often armed for secured areas as well as in general
areas during off hours such as nights or weekends
• Once armed, a central alarm system will alert when any
door or window is opened
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Physical Security
#MissionBeforeMoney

• Perimeter alarms include magnetic door and window alarms
• Include matched pairs of sensors on the wall, as well as
window/door
• An electrical circuit flows through the sensor pairs as
long as the door or window is closed; the circuit breaks
when either is opened
• Often armed for secured areas as well as in general
areas during off hours such as nights or weekends
• Once armed, a central alarm system will alert when any
door or window is opened
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Physical Security
#MissionBeforeMoney

Doors and Windows
• Attackers will often target the “weakest link in the chain”
• Examples of “weakest link” design include a concrete wall with a
hollow-core door, or a gypsum wall with a steel door.
• Door hinges should face inward, or be otherwise protected
• Doors with internal motion sensors should never include mail
slots
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Physical Security
#MissionBeforeMoney

Doors and Windows
• Externally-facing emergency doors should be marked for
emergency use only and equipped with panic bars. The use of a
panic bar should trigger an alarm.
• Glass windows are structurally weak and can be dangerous when
shattered. Bullet-proof or explosive-resistant glass can be used
for secured areas. Wire mesh or security film can lower the
danger of shattered glass and provide additional strength. Use of
simple glass windows in a secure perimeter requires a
compensating control such as window burglar alarms.
• Alternatives to glass windows include polycarbonate such as
Lexan and acrylic such as Plexiglass. Lexan is used in race cars
and airplanes for is strength and shatter resistance.
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Physical Security
#MissionBeforeMoney

Walls, floors, and ceilings
• Walls around any internal secure perimeter such as a data center should be “slab
to slab”
• Raised floors and drop ceilings can obscure where the walls truly start and stop
• Any wall protecting a secure perimeter (whether internal or external) should be
strong enough to resist cutting
• Simple gypsum “sheetrock” walls can be cut open with a sharp tool such as a
carpet knife, and should not be used for secure perimeters
• Walls should have an appropriate fire rating (the amount of time required to fail
due to a fire)
• The National Fire Protection Agency (NFPA) 75: Standard for the Protection of
Information Technology Equipment states “The computer room shall be
separated from other occupancies within the building by fire-resistant rated walls,
floor, and ceiling constructed of noncombustible or limited combustible
materials. The fire-resistant rating shall be commensurate with the exposure, but
not less than one hour.”
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Physical Security
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Guards
• A dynamic control
• May aid in inspection of access credentials, monitor CCTVs,
monitor environmental controls, respond to incidents, act as a
deterrent (all things being equal, criminals are more likely to
target an unguarded building over a guarded building), and more
• Professional guards have attended advanced training and/or
schooling; amateur guards (sometimes derogatively called “Mall
Cops”) have not
• Term “pseudo guard” means an unarmed security guard
• Guard's orders should be complete and clear
• Guards are often attacked via social engineering, so this threat
should be directly addressed via security awareness and training.
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Dogs
• Often used in controlled areas, such as between the exterior
building wall and a perimeter fence
• Primarily serve as both deterrent and detective controls
• A site without dogs is more likely to be physically attacked than a
site with dogs (deterrent), and dogs alert security guards through
barking (detective)
• The primary drawback to using dogs as a perimeter control is
legal liability
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Dogs
• Often used in controlled areas, such as between the exterior
building wall and a perimeter fence
• Primarily serve as both deterrent and detective controls
• A site without dogs is more likely to be physically attacked than a
site with dogs (deterrent), and dogs alert security guards through
barking (detective)
• The primary drawback to using dogs as a perimeter control is
legal liability
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Would you
ever attack
this?!?!
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Site selection, design, and configuration
• Describes the process of building a secure facility such as a data
center, from the site selection process through the final design
• The exam could pose a scenario where you are asked about any
part of the site selection process, beginning with the land the
data center will be built on
• Site selection is the “greenfield” process of choosing a site to
construct a building or data center. A “greenfield” is an
undeveloped lot of land.
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Topography
• The physical shape of the land: hills, valleys, trees, etc.
• Highly secure sites such as military installations will leverage
(and sometimes alter) the topography of the site as a defensive
measure
• Can be used to steer ingress and egress to controlled points
Utility Reliability
• Electrical outages are among the most common of all failures
and disasters
• Uninterruptible Power Supplies (UPSs) will provide protection
against electrical failure for a short period (usually hours or less)
• Generators provide longer protection, but will require refueling in
order to operate for extended periods.
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Crime
• Local crime rates also factor into site selection
• The primary issue is employee safety: all employees
have the right to a safe working environment
• Additional issues include theft of company assets
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Site Design and Configuration Issues
Site design cannot compensate for poor site selection decisions
Site Marking
• Data centers are not externally marked
• Attention-avoiding details such as muted building design
The Netflix DVD service avoids site marking of its service centers,
which look like nondescript warehouses in regular office parks. There
are no Netflix signs or corporate logos to be seen.
Assuming a low profile avoids drawing unwanted attention to the
warehouses, which adds defense-in-depth protection to the valuable
contents inside. As an additional bonus, this encourages subscribers
to return DVDs via postal mail (as opposed to attempting to return
DVDs by dropping them off in person).
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Shared Tenancy and Adjacent Buildings
• Other tenants in a building can pose security issues: they are already
behind the physical security perimeter
• Their physical security controls will impact yours: a tenant's poor visitor
security practices can endanger your security
• Adjacent buildings pose a similar risk
• Attackers can enter a less secure adjacent building and use that as a
base to attack an adjacent building, often breaking in through a shared
wall
• Many bank heists have been pulled off this way; including the theft of
over $20 million dollars from British Bank of the Middle East in 1976 (the
attackers blasted a hole through the shared wall of an adjacent church)
http://www.dailymail.co.uk/home/moslive/article-459185/Soldiers-
Fortune.html
• Another security risk associated with shared tenancy (or neighbors who
are physically close) is wireless security
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Shared Demarc
• demarc (the demarcation point, where the ISP's
(Internet Service Provider) responsibility ends and the
customer's begins)
• Most buildings have one demarc area, where all
external circuits enter the building
• Should employ strong physical access control,
including identifying, authenticating, and authorizing
all access
• For very secure sites, construction of multiple
segregated demarcs is recommended.
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System Defenses
• One of the last lines of defense in a defense-in-depth strategy
• Assume an attacker has physical access to a device or media containing
sensitive information
Asset Tracking
• You cannot protect your data unless you know where (and what) it is
• Data such as serial numbers and model numbers are useful in cases of loss due
to theft or disaster.
Port Controls
• Computers may contain multiple “ports” which may allow copying data to or from
a system
• USB drives can be small (some are smaller than a piece of chewing gum) and
inexpensive and may hold dozens of gigabytes or more
• Small enough to evade perimeter contraband checks
• Ports can be physically disabled
• Ports may also be electronically locked via system policy
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Drive and Tape Encryption
• Drive and tape encryption protect data at rest
• One of the few controls which will protect data after physical
security has been breached
• Recommended for all mobile devices and media containing
sensitive information which may physically leave a site or
security zone
• Whole-disk encryption of mobile device hard drives is
recommended
• Disk encryption/decryption may occur in software or hardware
• Many breach notification laws concerning Personally Identifiable
Information (PII) contain exclusions for lost data that is
encrypted
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Media Storage and Transportation
• All sensitive backup data should be stored offsite, whether
transmitted offsite via networks, or physically moved as backup
media
• Sites using backup media should follow strict procedures for
rotating media offsite
• Always use bonded and insured company for offsite media
storage
• The company should employ secure vehicles and store media at
a secure site
• Ensure that the storage site is unlikely to be impacted by the
same disaster that may strike the primary site, such as a flood,
earthquake, or fire
• Never use informal practices, which as storing backup media at
employee's houses
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Media Cleaning and Destruction
• All forms of media should be securely cleaned or destroyed
before disposal to prevent object reuse
• Objects may be physical (such as paper files in manila folders) or
electronic (data on a hard drive)
• Attacks range from nontechnical attacks such as dumpster
diving (searching for information by rummaging through
unsecured trash) to technical attacks such as recovering
information from unallocated blocks on a disk drive
• All cleaning and destruction actions should follow a formal
policy, and all such activity should be documented, including the
serial numbers of any hard disks, type of data they contained,
date of cleaning or destruction, and personnel performing these
actions
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Environmental Controls
• Designed to provide a safe environment for personnel
and equipment
• Power, HVAC, and fire safety are considered
environmental controls
Electricity
• Reliable electricity is critical for any data center
• One of the top priorities when selecting, building, and
designing a site
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Types of Electrical Faults
• All types of electrical faults can impact availability and
integrity
• The following are common types of electrical faults:
• Blackout: prolonged loss of power
• Brownout: prolonged low voltage
• Fault: short loss of power
• Surge: prolonged high voltage
• Spike: temporary high voltage
• Sag: temporary low voltage
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Surge Protectors, UPSs, and Generators
Provide protection against electrical failures
Surge Protectors
• Protect equipment from damage due to electrical surges
• Contain a circuit or fuse which is tripped during a power spike or surge,
shorting the power or regulating it down to acceptable levels
Uninterruptible Power Supplies
• Provide temporary backup power in the event of a power outage
• May also “clean” the power, protecting against surges, spikes, and other
forms of electrical faults
• Backup power is provided via batteries or fuel cells
• Provide power for a limited period of time, and can be used as a bridge
to generator power; generators typically take a short period of time to
start up and begin providing power
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Generators
• Designed to provide power for longer periods of times than UPSs
• Will run as long as fuel is available
• Sufficient fuel should be stored onsite for the period the
generator is expected to provide power
• Refueling strategies should consider a disaster's effect on fuel
supply and delivery
• Generators should not be placed in areas which may flood or
otherwise be impacted by weather events
• Should be tested and serviced regularly.
• http://www.cumminspower.com/www/literature/technicalpaper
s/PT-7006-Standby-Katrina-en.pdf
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EMI
• All electricity generates magnetism, so any electrical
conductor emits Electromagnetic Interference (EMI)
• Network cables that are poorly shielded or run too
closely together may suffer crosstalk, where
magnetism from one cable “crosses” over to another
nearby cable
• Crosstalk can be mitigated via proper network cable
management
• Never route power cables close to network cables
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HVAC
• Keep the air at a reasonable temperature and humidity
• Operate in a closed loop, recirculating treated air (helps reduce dust and
other airborne contaminants)
Positive Pressure and Drains
• All HVAC units should employ positive pressure and drainage
• Means air and water should be expelled from the building
• Untreated air should never be “inhaled” into the building, and water
should drain away from the building
• A common malfunction of HVAC units is condensation of water pooling
into the building, often going under raised floors where it may not be
detected
• Positive drains are designed to avoid this problem
• Location of all gas and water lines, as well as all drains, should be
formally documented.
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HVAC
• Keep the air at a reasonable temperature and humidity
• Operate in a closed loop, recirculating treated air (helps reduce dust and
other airborne contaminants)
Positive Pressure and Drains
• All HVAC units should employ positive pressure and drainage
• Means air and water should be expelled from the building
• Untreated air should never be “inhaled” into the building, and water
should drain away from the building
• A common malfunction of HVAC units is condensation of water pooling
into the building, often going under raised floors where it may not be
detected
• Positive drains are designed to avoid this problem
• Location of all gas and water lines, as well as all drains, should be
formally documented.
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Heat and Humidity
• Humidity levels of 40-55% are recommended
• A commonly recommended “set point” temperature range for a data
center is 68-77 °F (20-25 °C)
• With sufficient data center airflow, higher temperatures can be used
• Can result in energy savings; however, the data center may heat to
dangerous levels more quickly in the event of HVAC failure
Note - Many sources cite 68-72 °F (20-22 °C) as the optimum data center
temperature range; in 2004, the American Society of Heating, Refrigerating
and Air-Conditioning Engineers (ASHRAE) recommended up to 77 °F/25 °C.
• (Green) As a result, the 2008 ASHRAE recommendations allow a much
wider range: temperature of 18 °C (64.4 °F) to 27 °C (80.6 °F) and
humidity from 25% to 60%, depending on the dew point. Higher set
points require adequate airflow. Details may be found at
http://tc99.ashraetcs.org
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Static and Corrosion
• Sudden static discharge can cause damage from system reboots
to chip or disk damage
• Static is mitigated by maintaining proper humidity, proper
grounding all circuits in a proper manner, and using antistatic
sprays, wrist straps, and work surfaces
• Personnel working with sensitive computer equipment such as
boards, modules, or memory chips should ground themselves
before performing any work.
• High humidity levels can allow the water in the air to condense
onto (and into) equipment, which may lead to corrosion.
• Both static and corrosion are mitigated by maintaining proper
humidity levels.
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Airborne Contaminants
• Dust is a common problem: airborne dust particles
can be drawn into computer enclosures, where they
become trapped
• Built-up dust can cause overheating and static buildup
• CPU fans can be impeded by dust buildup, which can
lead to CPU failure due to overheating
• Other contaminants can cause corrosion or damaging
chemical reactions.
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Heat, Flame, and Smoke Detectors
• Three methods for detecting fire
• Typically alert locally, and may also be centrally monitored by a
fire alarm system
• An audible alarm and flashing lights should be used, so that both
deaf and blind personnel will be aware of the alarm
Heat Detectors
• Alert when temperature exceeds an established safe baseline
• May trigger when a specific temperature is exceeded or when
temperature changes at a specific rate (such as “10 °F in less
than 5 minutes”)
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Smoke Detectors
• Work through two primary methods: ionization and photoelectric
• Ionization-based smoke detectors contain a small radioactive source which
creates a small electric charge
• Photoelectric sensors work in a similar fashion, except that they contain an LED
(Light Emitting Diode) and a photoelectric sensor that generates a small charge
while receiving light
• Both types of alarm alert when smoke interrupts the radioactivity or light,
lowering or blocking the electric charge
• Dust should always be avoided in data centers. Small airborne dust particles can
trigger smoke detectors just as smoke does, leading to false alarms.
Flame Detectors
• Detect infrared or ultraviolet light emitted in fire
• One drawback to this type of detection is that the detector usually requires line-
of-site to detect the flame; smoke detectors do not have this limitation
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Safety Training and Awareness
• Training provides a skill set such as learning to operate an
emergency power system
• Awareness changes user behavior (“Don't let anyone follow you
into the building after you swipe your access card”)
Evacuation Routes
• Evacuation routes should be prominently posted
• All personnel should be advised of the quickest evacuation route
from their areas
• Guests should be advised of evacuation routes as well
• All sites should use a meeting point, where all personnel will
meet in the event of emergency
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Evacuation Roles and Procedures
• The two primary evacuation roles are safety warden and meeting
point leader
• The safety warden ensures that all personnel safely evacuate the
building in the event of an emergency or drill
• The meeting point leader assures that all personnel are
accounted for at the emergency meeting point
• Special care should be given to any personnel with handicaps,
which could affect egress during an emergency
• Elevators should never be used during a fire
• All sites should have mitigating controls to allow safe egress for
all personnel
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ABCD Fires and Suppression
• Fire suppression systems are used to extinguish fires
• Different types of fires require different suppressive
agents
• Class K fires are kitchen fires, such as burning oil or
grease. Wet chemicals are used to extinguish class K
fires.
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ABCD Fires and Suppression
• Fire suppression systems are used to extinguish fires
• Different types of fires require different suppressive
agents
• Class K fires are kitchen fires, such as burning oil or
grease. Wet chemicals are used to extinguish class K
fires.
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Types of Fire Suppression Agents
• Always consult local fire code before implementing a
fire suppression system
• All fire suppression agents work via four methods
(sometimes in combination):
• reducing the temperature of the fire,
• reducing the supply of oxygen,
• reducing the supply of fuel,
• interfering with the chemical reaction within fire
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Water
• Suppresses fire by lowering the temperature below
the kindling point (also called the ignition point)
• Safest of all suppressive agents, and recommended
for extinguishing common combustible fires such as
burning paper or wood
• It is important to cut electrical power when
extinguishing a fire with water to reduce the risk of
electrocution
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Soda Acid
• Old giant brass fire extinguishers
• Suppress fire by lowering temperature, soda acid also
has additional suppressive properties beyond plain
water: it creates foam which can float on the surface
of some liquid fires, starving the oxygen supply
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Soda Acid
• Old giant brass fire extinguishers
• Suppress fire by lowering temperature, soda acid also
has additional suppressive properties beyond plain
water: it creates foam which can float on the surface
of some liquid fires, starving the oxygen supply
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Dry Powder
• Dry powder (such as sodium chloride) works by
lowering temperature and smothering the fire, starving
it of oxygen.
• Dry powder is primarily used to extinguish metal fires
(flammable metals include sodium, magnesium, and
many others)
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CO2
• Fires may be smothered by removing the oxygen: this is how CO2
fire suppression works.
• A risk associated with CO2 is it is odorless and colorless, and our
bodies will breathe it as air. By the time we begin suffocating due
to lack of oxygen, it is often too late.
• CO2 is dangerous suppressive agent, which is only
recommended in unstaffed areas such as electrical substations
• Any personnel entering a CO2-protected area should be trained
for CO2 safety; additional safety controls (such as oxygen tanks)
are usually recommended
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Halon and Halon Substitutes
• Extinguishes fire via a chemical reaction that consumes energy and lowers the
temperature of the fire
• Halon is being phased out, and a number of replacements with similar properties
are now used
Montreal Accord
• Halon has ozone-depleting properties
• The 1989 Montreal Protocol (formally called the “Montreal Protocol on
Substances That Deplete the Ozone Layer”) banned production and consumption
of new halon in developed countries by January 1, 1994.
• Existing halon systems may be used. While new halon is not being produced,
recycled halon may be used
• There are exceptions for certain critical uses, such as airplanes and submarines.
See http://ozone.unep.org for more information on the Montreal Protocol.
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Halon Replacements
Recommended replacements for halon include the following systems:
• Argon
• FE-13
• FM-200
• Inergen
FE-13 is the newest of these agents, and comparatively safe. It may
be breathed in concentrations of up to 30%. Other halon
replacements are typically only safe up to 10-15% concentration.
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Sprinkler Systems
• All sprinkler systems should be combined with a fire alarm that
alerts people to evacuate
• Safe evacuation is the primary goal of fire safety.
Wet Pipe
• Wet pipes have water right up to the sprinkler heads: the pipes
are “wet.”
• The sprinkler head contains a metal (common in older sprinklers)
or small glass bulb designed to melt or break at a specific
temperature
• The sprinkler head opens and water flows
• Each head will open independently as the trigger temperature is
exceeded.
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Wet Pipe
• Bulbs come in different colors, which indicate the ceiling
temperature which will trigger the bulb to burst and open the
sprinkler head
• The colors used are
• orange (135 °F/57 °C),
• red (155 °F/68 °C),
• yellow (175 °F/79 °C),
• green (200 °F/93 °C),
• blue (286 °F/141 °C)
NFPA 13: Standard for the Installation of Sprinkler Systems describes
the color conventions used for these sprinkler heads. See:
http://www.nfpa.org/aboutthecodes/AboutTheCodes.asp?DocNum=
13
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Pre-Action
• Combination of wet, dry, or deluge systems, and require two
separate triggers to release water
• Single interlock systems release water into the pipes when a fire
alarm triggers
• The water releases once the head opens
• Double interlock systems use compressed air (same as dry
pipes): the water will not fill the pipes until both the fire alarm
triggers and the sprinkler head opens
• Preaction systems are used in areas such as museums, where
accidental discharge would be expensive.
• Double-interlock systems are used in cold areas such as freezers
to avoid frozen pipes
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Portable Fire Extinguishers
• Should be marked with the type of fire they are
designed to extinguish
• Should be small enough to be operated by any
personnel who may need to use one
• Use the “PASS” method to extinguish a fire with a
portable fire extinguisher:
• Pull the pin
• Aim low
• Squeeze the pin
• Sweep the fire
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HOLY MOLY! That was a long Domain with a lot of
information!
Please try to catch up in your reading. You’ve got the
weekend and a day off next week.
• We left off on page 212 in the book.
• Monday (5/4) gets technical.
• Brad is leading next class. He’s good at technicalling!
Have a great evening, talk to you Monday!
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2020 FRSecure CISSP Mentor Program - Class 5

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2020 FRSecure CISSP Mentor Program - Class 5