CS283 Class 3 Recap - 20090922

CS283 Class 3 Recap - 20090922 - Class 3 (20090915) Recap,...

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CS 172/283 Autumn 2009 GWU Class 3 (20090915) Recap, Additional Concepts, Q&A, and Additional Reading
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GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 2 Class 3 (20090915) Recap Review of Key Concepts Review of Additional concepts Student Comments on Additional Readings/Viewings from Class 1-3 A look at a real vulnerability bulletin published by Cisco A look at a Microsoft Security Bulletin (monthly Patch Tuesday) More on VPN’s Examples of Phishing Why Seamless Security is such a Challenge Additional Reading Continue Lecture at Lecture 2 – Part 2 – Block Ciphers - AES Quiz #1 Review (last 15 minutes)
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GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 3 Class 3 (20090915) Recap Review of Key Concepts – Stream Ciphers Mod 2 arithmetic Syhcnronous vs Asynchronous (self synchronizing) stream cipher Periodic Stream Cipher Vigenere cipher as an example of a stream Cipher One time pad (OTP) as an example of a stream cipher RC4 – a widely used stream cipher Linear Feedback Shift Register (LFSR) for key stream generation to approximate an OTP LFSR architecture: Shift register and taps Periodicity of LFSR Introducing non-linearity to improve pseudo-randomness of a generator Use of Block Cipher in Cipher Block Chaining Mode as a kestream generator Error Recovery in a self-synchronizing stream cipher
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GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 4 Class 3 (20090915) Recap Review of Key Concepts – Block Ciphers Data Encryption Standard (DES) Sbox implementation Petrmutation and Substitution Networks Multi-round algorithms Linear and Differential Cryptanalysis Advanced Encryption Standard
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GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 5 Class 3 (20090915) Recap Additional concepts Base 16 and Base 2 numbering Protocol Stack - ISO Model vs ITEF Model
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GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 6 Class 3 (20090915) Recap Additional concepts Base 16 (Hexadecimal) and Base 2 (binary) numbering Examples A0 16 = 160 10 = 10100000 2 FFFF 16 = 65535 10 = 1111111111111111 2
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GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 7 Class 3 (20090915) Recap Additional concepts ISO Model IETF Model Example Protocol that Implements the Corresponding Protocol Layer Application Application HTTP Presentation Session Transport Transport TCP Network Network IP Data Link LLC Sublayer MAC Sublayer Link Ethernet Physical Physical IEEE 802.3u Comparison of ISO and IETF Protocol Stack Models
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GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 8 Class 3 (20090915) Recap Student Comments on Additional Readings / Viewings from Class 1-3 1. (Class 1) "A Practical Message Falsification Attack on WPA” 2. (Class 1) “U.S. payment-card industry grapples with security” 3. (Class 1) “European Cyber-Gangs Target Small U.S. Firms, Group Says”
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CS283 Class 3 Recap - 20090922 - Class 3 (20090915) Recap,...

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