Symmetric Cryptography Essential Training

Introduction

• Cryptography is everywhere
• Basic terminology

1. Symmetric Cryptography

• Cryptography's role
• Kerckhoffs's principle
• Symmetric keys
• Block vs. stream ciphers

2. Representing and Manipulating Binary Data

• Binary representation
• Characters
• Integers
• Floating point numbers
• Boolean logical operations
• Padding

3. Fundamental Algorithms and Components

• Simple substitution ciphers
• Polyalphabetic substitution ciphers
• Permutation and transposition ciphers
• Simple one-time pads with XOR
• S-Box and P-Box
• Feistel ciphers
• Linear-feedback shift registers (LFSRs)

4. Symmetric Algorithms

• The Data Encryption Standard (DES)
• The Advanced Encryption Standard (AES)
• AES and DES in practice
• The RC4 stream cipher

5. Block Cipher Modes

• Introduction to block cipher modes
• Cipher block chaining (CBC)
• CFB: Cipher feedback
• OFB: Output feedback
• CTR: Counter

Conclusion

• Next steps