Block Encryption and DES

• Symmetric Cipher Model
• Some Basic Terminology
• Substitution
• Substitution: Other forms
• Transposition (Permutation) Ciphers
• Product Ciphers
• Block vs. Stream Ciphers
• Shannons S-P Networks
• Feistel Cipher Structure
• Feistel Cipher Design Elements
• Data Encryption Standard (DES)
• 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

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