CS283 Class 3 Recap - 20090922

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

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Class 3 (20090915) Recap, Additional Concepts, Q&A, and Additional Reading CS 172/283 Autumn 2009 GWU
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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 xamples of Phishing Examples of Phishing Why Seamless Security is such a Challenge Additional Reading Continue Lecture at Lecture 2 – Part 2 – Block Ciphers - AES GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 2 Quiz #1 Review (last 15 minutes)
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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 GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 3
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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 GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 4
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lass 3 (20090915) Recap Class 3 (20090915) Recap Additional concepts Base 16 and Base 2 numbering • Protocol Stack - ISO Model vs ITEF Model GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 5
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lass 3 (20090915) Recap Class 3 (20090915) Recap Additional concepts ase 16 (Hexadecimal) and Base 2 (binary) numbering •Base 16 (Hexadecimal) and Base 2 (binary) numbering •Examples A0 16 = 160 10 = 10100000 2 FFFF 16 = 65535 10 = 1111111111111111 2 GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 6
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Class 3 (20090915) Recap Additional concepts Comparison of ISO and IETF Protocol Stack Models ISO Model IETF Model Example Protocol that Implements the Corresponding Protocol Layer otoco aye Application Application HTTP Presentation Session Transport Transport TCP Network Network IP Data Link LLC Sublayer MAC Sublayer Link Ethernet GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 03 - Rev 20090922 7 Physical Physical IEEE 802.3u
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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”
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CS283 Class 3 Recap - 20090922 - Class 3 (20090915) Recap,...

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