Network Security and Surveillance
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1 G. Sivakumar Computer Science and Engineering IIT Bombay October 29, Internet Security Overview Some Puzzles 2 3
2 Internet s Growth and Charter Some Puzzles Information AnyTime, AnyWhere, AnyForm, AnyDevice,...
3 Internet s Dream Internet Security Overview Some Puzzles Why should a fridge be on Internet? Will security considerations make this a nightmare?
4 What are Cyber crimes? Some Puzzles Against People Cyber Stalking and Harrassment (Child) Pornography Against Property Cracking Virus and Spam Software/Entertainment Piracy Cyber Terrorism!
5 Security Concerns Internet Security Overview Some Puzzles Match the following! Problems Attackers Highly contagious viruses Unintended blunders Defacing web pages Disgruntled employees or customers Credit card number theft Organized crime On-line scams Foreign espionage agents Intellectual property theft Hackers driven by technical challenge Wiping out data Petty criminals Denial of service Organized terror groups Spam s Information warfare Reading private files... Surveillance... Crackers vs. Hackers Note how much resources available to attackers.
6 Cyber Terrorism? Internet Security Overview Some Puzzles Some examples from : Legion of Doom group took over the BellSouth telephone system, tapped phone lines, re-routed calls, : A white supremacist movement took out a Massachusetts internet service provider 1997: A cracker disabled the computer system of an airport control tower at the Worcester, Mass. Airport. 1997: a hacker in Sweden jammed the 911 emergency telephone system all throughout west-central Florida. 1998: NASA, Navy, and Defence Department computers were attacked. 2000: in Maroochy Shire, Australia, a disgruntled consultant hacked into a waste management control system and released millions of gallons of raw sewage on the town. 2001: Two post-graduate students cracked a bank system used by banks and credit card companies to secure the personal
7 Vulnerabilities Internet Security Overview Some Puzzles Application Security Buggy code Buffer Overflows Host Security Server side (multi-user/application) Client side (virus) Transmission Security
8 Denial of Service Internet Security Overview Some Puzzles Small shop-owner versus Supermarket What can the attacker do? What has he gained or compromised? What defence mechanisms are possible? Screening visitors using guards (who looks respectable?) VVIP security, but do you want to be isolated? what is the Internet equivalent?
9 Security Requirements Some Puzzles Informal statements (formal is much harder) Confidentiality Protection from disclosure to unauthorized persons Integrity Assurance that information has not been modified unauthorizedly. Authentication Assurance of identity of originator of information. Non-Repudiation Originator cannot deny sending the message. Availability Not able to use system or communicate when desired. Anonymity/Pseudonomity For applications like voting, instructor evaluation. Traffic Analysis Should not even know who is communicating with whom. Why? Emerging Applications Online Voting, Auctions (more later) And all this with postcards (IP datagrams)!
10 Exchanging Secrets Internet Security Overview Some Puzzles Goal A and B to agree on a secret number. But, C can listen to all their conversation. Solution? A tells B: I ll send you 3 numbers. Let s use their LCM as the key.
11 Exchanging Secrets Internet Security Overview Some Puzzles Goal A and B to agree on a secret number. But, C can listen to all their conversation. Solution? A tells B: I ll send you 3 numbers. Let s use their LCM as the key.
12 Mutual Authentication Some Puzzles Goal A and B to verify that both know the same secret number. No third party (intruder or umpire!) Solution? A tells B: I ll tell you first 2 digits, you tell me the last two...
13 Mutual Authentication Some Puzzles Goal A and B to verify that both know the same secret number. No third party (intruder or umpire!) Solution? A tells B: I ll tell you first 2 digits, you tell me the last two...
14 Cryptography and Data Security sine qua non [without this nothing :-] Historically who used first? (L & M) Code Language in joint families!
![:-] Historically who used first?](/docs-images/51/13409813/images/page_14.jpg "(L & M) Code Language in joint")
15 Symmetric/Private-Key Algorithms
16 Asymmetric/Public-Key Algorithms Keys are duals (lock with one, unlock with other) Cannot infer one from other easily How to encrypt? How to sign?
17 One way Functions Mathematical Equivalents Factoring large numbers (product of 2 large primes) Discrete Logarithms
18 Security Mechanisms System Security: Nothing bad happens to my computers and equipment virus, trojan-horse, logic/time-bombs,... Network Security: Authentication Mechanisms you are who you say you are Access Control Firewalls, Proxies who can do what Data Security: for your eyes only Encryption, Digests, Signatures,...
19 Security Mechanisms System Security: Nothing bad happens to my computers and equipment virus, trojan-horse, logic/time-bombs,... Network Security: Authentication Mechanisms you are who you say you are Access Control Firewalls, Proxies who can do what Data Security: for your eyes only Encryption, Digests, Signatures,...
20 Security Mechanisms System Security: Nothing bad happens to my computers and equipment virus, trojan-horse, logic/time-bombs,... Network Security: Authentication Mechanisms you are who you say you are Access Control Firewalls, Proxies who can do what Data Security: for your eyes only Encryption, Digests, Signatures,...
21 Network Security Mechanism Layers Cryptograhphic Protocols underly all security mechanisms. Real Challenge to design good ones for key establishment, mutual authentication etc.
22 What is RFID? Not just super barcode. Already in use by Andhra Pradesh police?
23 How RFID works
24 RFID Tags Internet Security Overview Passive Cheapest: no battery in tag All power comes from reader Semi Passive With batteries Improved performance and reliability Increased size and cost Active High performance and cost Active
25 Privacy Concerns
26 RFID Applications Payment Toll collection Fuel payment (Speedpass) Parking Pre-payment card (Dexit) Supply Chain Mgmt Logistics Inventory Mgmt Asset Tracking High value assets Re-useable containers Shipping containers Inventory Access Control Card Keys Automotive anti-theft Anti-theft Shrinkage Automotive anti-theft Track & Trace Food Pharmaceuticals Books Parts/lots tracking Apparel
27 References Internet Security Overview Books TCP/IP Illustrated by Richard Stevens, Vols 1-3, Addison-Wesley. Applied Cryptography - Protocols, Algorithms, and Source Code in C by Bruce Schneier, Jon Wiley & Sons, Inc Cryptography and Network Security: Principles and Practice by William Stallings (2nd Edition), Prentice Hall Press; Practical Unix and Internet Security, Simson Garfinkel and Gene Spafford, O Reilly and Associates, ISBN Web sites (Centre for Education and Research in Information Assurance and Security) (System Administration, Audit, Network Security) cve.mitre.org (Common Vulnerabilities and Exposures) csrc.nist.gov (Computer Security Resources Clearinghouse)
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30 Independent Study. 60 (e.g. lectures, seminars and supervised group activity)
1. Programme Title BSc Digital & Technology Solutions 2. Unit Title Data and Security 3. HE Level UG1 FHEQ Level 4 4. Unit Code DTS16104 5. Credit Value of Unit 30 6. Unit Type Mandatory 7. Unit Tutor