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lec-03 - CSE565 Computer Security Lectures 3 4 Block...

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1 9/08/09 UB Fall 2009 CSE565: S. Upadhyaya Lec 3.1 CSE565: Computer Security Lectures 3 & 4 Block Ciphers and Data Encryption Standard Shambhu Upadhyaya Computer Science & Eng. University at Buffalo Buffalo, New York 14260 9/08/09 UB Fall 2009 CSE565: S. Upadhyaya Lec 3.2 Overview Block Ciphers – 10 minutes Description of DES – 55 minutes Encryption Algorithm (Initial Permutation, Key Transformation, Expansion Permutation, S-Box, P-Box, Final Permutation) Decryption Algorithm Security of DES – 10 minutes Cryptanalysis – Linear, Differential & Related key– 10 minutes DES Variants – 5 minutes (some slides adapted from Lawrie Brown)
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