Threats to an information system
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Threats to information systems include hardware failure, software failure, electrical problems, personnel actions, user errors, access penetration, program changes, theft of data/services/equipment, and telecommunications problems. Viruses are software programs that can damage systems by destroying data, disrupting processing and memory. Common computer viruses include worms, Trojan horses, spyware, and adware. Antivirus software helps detect and eliminate viruses to protect systems and data. Encryption and authentication techniques can enhance security and privacy over the internet and in communications.
Threats to an information system
- 1. THREATS TO INFORMATION SYSTEMS Presented By: Nimisha Walecha MBA( Gen) Roll No. E13
- 2. Threats to information systems Hardware failure Fire Software failure Electrical problems Personnel actions User errors Access penetration, program changes Theft of data, services, equipment Telecommunications problems
- 3. What is a Computer Virus? A software program Difficult to detect Spreads rapidly Destroys data Disrupts processing & memory Can ONLY catch a virus by running a program All computer viruses are man-made
- 6. There are viruses that can simply display annoying messages on your computer screen and go away. On the other hand, there are viruses that can cause real harm to your computer by wiping out all information on your hard drive or changing all your file extensions. Viruses are becoming more prevalent because they can spread rapidly around the world by the click of a mouse.
- 7. Basic virus terminology Worm Special type of virus that can replicate itself and use memory, but cannot attach itself to other programs. Uses computer networks to replicate itself. Trojan Horse A computer program that installs malicious software under the guise of doing something else. Trojan Horses do not reproduce automatically.
- 10. Spyware Spyware is a small program or piece of code that is secretly installed on your computer and designed to “spy” on your online activity and/or personal information. It also interferes with user control of the computer in other ways, such as installing additional software, redirecting Web browser activity etc. Symptoms- Your computer is running much slower than usual . Your computer takes a lot longer to boot up than it used to. You see a lot of activity on your network connection.
- 11. Adware (Spyware’s close cousin) Adware tracks your browsing habits, the type of ads you click on, bookmarks you make and other similar online activities. Because adware’s purpose is designed to get you to perform an action, it is much easier to recognize than spyware. Symptoms- Pop-up ads that won’t quit. A hijacked browser home page. Search results that make no sense - Clicking on the links here will install spyware on your PC.
- 13. Other computer viruses Concept, Melissa: Word documents, e-mail. Deletes files Form: Makes clicking sound, corrupts data Explore.exe: Attached to e-mail, tries to e-mail to others, destroys files Monkey: Windows won’t run Chernobyl: Erases hard drive, ROM bios JUNKIE: Infects files, boot sector, memory conflicts
- 14. Antivirus software Software to detect viruses Eliminate viruses Advanced versions run in memory to protect processing, guard against viruses on disks, and on incoming network files All major anti-virus software includes an “e-mail scan” feature that will check your e-mail attachments for viruses before you open the attachments.
- 15. SECURITY AND THE INTERNET ENCRYPTION: Coding & scrambling messages to deny unauthorized access AUTHENTICATION: Ability to identify another party
- 16. SECURITY AND THE INTERNET PUBLIC KEY ENCRYPTION SENDER SCRAMBLED MESSAGE RECIPIENT Encrypt with public key Decrypt with private key
- 17. Principles of a Simple Cryptography Substitution THIS IS A SECRET (key n=3) WKLV LV D VHFUHW Transposition THIS IS A SECRET (key 4213) IHSTSI S EAERTC
- 18. Caesar Cipher ABCDEFGHIJKLMNOPQRSTUVWXYZ Rotate 13 points NOPQRSTUVWXYZABCDEFGHIJKLM
- 19. THE GOTHS COMETH (Plaintext) (n=13) GUR TAFUE PAYRFU ( Ciphertext )
- 20. Rotating Key Cipher ABCDEFGHIJKLMNOPQR S TUVWXYZ BCDEFGHIJKLMNOPQRS T UVWXYZA CDEFGHIJKLMNOPQRST U VWXYZAB DEFGHIJKLMNOPQRSTU V WXYZABC EFGHIJKLMNOPQRSTUV W XYZABCD FGHIJKLMNOPQRSTUVW X YZABCDE GHIJKLMNOPQRSTUVWX Y ZABCDEF HIJKLMNOPQRSTUVWXY Z ABCD...
- 21. General Principles Longer keys make better ciphers Random keys make better ciphers Good ciphers produce “random” ciphertext Best keys are used once and thrown away
- 22. THANK YOU