Computer Crime Computer and Network Security

1. Computer Crime Computer and Network Security

2. Identity Theft • Background • History and role of the Social Security Number • Debate over a national ID Card • REAL ID Act

3. Background • Identity theft: misuse of another person’s identity to take actions permitted the owner • Credit card fraud #1 type of identity theft • Ease of opening accounts contributes to problem • 10 million victims in 2004 alone • Average loss: $5,000

4. Gaining Access to Information • Mailboxes • Lost or stolen wallets • Dumpster diving • Shoulder surfing • Skimmers (wedges) • Phishing

5. History, Role of Social Security Number • Social Security cards first issued 1936 • Originally used only for SS purposes • Use of SSN has gradually increased • SSN is a poor identification number • Not unique • Rarely checked • No error-detecting capability

6. Arguments for a National ID Card • Current ID cards are second-rate • Would reduce illegal entry to U.S. • Would prevent illegal aliens from working • Would reduce crime • Other democratic countries have national ID cards

7. Arguments against a National ID Card • No card positively guarantees identification • No biometric-based system is 100% accurate • No evidence it will reduce crime • Makes government data mining simpler • Make law-abiding people more vulnerable to fraud and indiscretions

8. The REAL ID Act • Signed in May 2005 • Significantly changes driver’s licenses in the United States • New licenses • Issued by end of 2008 • Required to open bank account, fly on commercial airplane, or receive government service • Requires applicants to supply 4 different Ids • Will probably contain a biometric identifier • Must contain data in machine-readable form

9. Possible Consequences of New Licenses • Better identification means better law enforcement • People won’t be able to change identities • Parents ducking child support • Criminals on the run • New, centralized databases could lead to more identity theft

10. Introduction • Computers getting faster and less expensive • Utility of computers increasing • Email • Web surfing • Shopping • Managing personal information • Increasing use of computers  growing importance of computer security

11. Viruses, Worms, and Trojan Horses • Viruses • Worms • The Internet worm • Trojan horses • Defensive measures

12. Viruses (1/2) • Virus: piece of self-replicating code embedded within another program (host) • Viruses associated with program files • Hard disks, floppy disks, CD-ROMS • Email attachments • How viruses spread • Diskettes or CDs • Email • Files downloaded from Internet

13. Viruses (2/2) • Well-known viruses • Brain • Michelangelo • Melissa • Love Bug • Viruses today • Commercial antivirus software • Few people keep up-to-date

14. Worms • Worm • Self-contained program • Spreads through a computer network • Exploits security holes in networked computers • Famous worms • WANK • Code Red • Sapphire (Slammer) • Blaster • Sasser

15. The Internet Worm • Robert Tappan Morris, Jr. • Graduate student at Cornell • Released worm onto Internet from MIT computer • Effect of worm • Spread to 6,000 Unix computers • Infected computers kept crashing or became unresponsive • Took a day for fixes to be published • Impact on Morris • Suspended from Cornell • 3 years’ probation + 400 hours community service • $150,000 in legal fees and fines

16. Trojan Horses • Trojan horse: program with benign capability that masks a sinister purpose • Remote access Trojan: Trojan horse that gives attack access to victim’s computer • Back Orifice • SubSeven • RAT servers often found within files downloaded from erotica/porn Usenet sites

17. Defensive Measures • System administrators play key role • Authorization: determining that a user has permission to perform a particular action • Authentication: determining that people are who they claim to be • Firewall: a computer monitoring packets entering and leaving a local area network

18. Phreaks and Hackers • Hackers • Phone Phreaking • The Cuckoo’s Egg • Legion of Doom • U.S. v. Riggs • Steve Jackson Games • Retrospective • Penalties for Hacking

19. Hackers (1/2) • Original meaning • Explorer • Risk-taker • Technical virtuoso • Hacker ethic • Hands-on imperative • Free exchange of information • Mistrust of authority • Value skill above all else • Optimistic view of technology

20. Hackers (2/2) • Meaning of “hacker” changed • Movie WarGames • Teenagers accessing corporate or government computers • Dumpster diving • Social engineering • Malicious acts • Destroying databases • Stealing confidential personal information

21. Phone Phreaking • Phone phreak: someone who manipulates phone system to make free calls • Most popular methods • Steal long-distance telephone access codes • Guess long-distance telephone access codes • Use a “blue box” to get free access to long-distance lines • Access codes posted on “pirate boards”

22. The Cuckoo’s Egg • Clifford Stoll: system administrator at Lawrence Berkeley Laboratory • Tracked accounting error, discovered unauthorized user • Hacker was accessing military computers • FBI, CIA, NSA, AFOSI, DIA joined search • Trail led to group of West German hackers

23. Legion of Doom • Elite group of hackers/phreaks recruited by “Lex Luthor” • LOD member Robert Riggs copied E911 Document from a Bell South Computer • Craig Neidorf published edited E911 Document in his BBS magazine, Phrack

24. U.S. v. Riggs • Riggs and Neidorf arrested • Charged with wire fraud • Interstate transportation of stolen property valued at $79,449 • Computer fraud • Riggs pleaded guilty to wire fraud; went to federal prison • Neidorf pleaded not guilty • Defense showed similar info being sold for < $25 • Prosecution moved to dismiss charges

25. Steve Jackson Games • Steve Jackson Games (SJG) published role-playing games and operated BBS • Loyd Blankenship • Key SJG employee • LOD member • Published E911 document on his own BBS • Secret Service raided SJG and seized computers, looking for copy of E911 Document • Led to creation of Electronic Frontier Foundation • EFF backed successful SJG lawsuit of Secret Service

26. Retrospective • Parallels between hackers and those who download MP3 files • Establishment overvalues intellectual property • Use of technology as a “joy ride” • Breaking certain laws that not that big a deal • Parallels between response of Secret Service and response of RIAA • Cyberspace is real • Those who break the law can be identified • Illegal actions can have severe consequences

27. Penalties for Hacking • Examples of illegal activities • Accessing without authorization any Internet computer • Transmitting a virus or worm • Trafficking in computer passwords • Intercepting a telephone conversation, email, or any other data transmission • Accessing stored email messages without authorization • Adopting another identity to carry out an illegal activity • Maximum penalty: 20 years in prison + $250,000 fine

28. Denial-of-Service Attacks • Definition • Attacks that consume scarce resources • Defensive measures • Distributed denial-of-service attacks • SATAN

29. Definition • Denial-of-service attack: an intentional action designed to prevent legitimate users from making use of a computer service • Goal of attack: disrupt a server’s ability to respond to its clients • About 4,000 Web sites attacked each week • Asymmetrical attack that may prove popular with terrorists

30. Attacks that Consume Scarce Resources • SYN flood attack • Smurf attack • Fill target computer’s hard disk • Email bombing • Worm • Break-in followed by file copying

31. Defensive Measures • Physical security of server • Benchmarking • Disk quota systems • Disabling unused network services • Turning off routers’ amplifier network capability

32. Distributed Denial-of-Service Attacks • Attacker gains access to thousands of computers • Launches simultaneous attack on target servers • Defensive measures • Secure computers to prevent hijackings • Check for forged IP addresses

33. SATAN • Security Administrator Tool for Analyzing Networks (SATAN) • Allows administrators to test their systems • Could be used to probe other computers • Critics worried SATAN would turn unskilled teenagers into hackers • That never happened