Block Ciphers and DES

• Block vs Stream Ciphers
• Shannon’s S-P Networks
• Feistel Cipher Structure
• Feistel Cipher Design Elements
• Data Encryption Standard (DES)
• DES Encryption Overview
• 1. Initial and Final Permutation
• 2. DES Round Structure
• Substitution Boxes
• 3. DES Sub-Key Generation
• DES Decryption
• Avalanche Effect
• Avalanche in DES
• Strength of DES
• Differential Cryptanalysis
• Linear Cryptanalysis
• Block Cipher Design Principles
• Summary
• Homework 3
• Lab Homework 3
• 1. PWDump3
• 2. Find your password
• 3. Change your password

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