1. CS 483 – SD SECTION BY DR. DANIYAL ALGHAZZAWI (2) Information Security

2. Cryptography Ciphers 1. Classic Substitution e.g., Caesar Cipher Transposition e.g., Route Cipher Hybrid 2. Modern Symmetric (Private Key) Stream Cipher e.g., RC4, A5/1 Block Cipher e.g., DES, AES Asymmetric (Public Key) e.g., RSA Hybrid

3. Substitution Cipher Caesar Cipher

4. Substitution Cipher Tap Code

5. Substitution Cipher Pigpen Cipher

6. Substitution Cipher Vigenère Cipher

7. Substitution Cipher Codebook Cipher

8. Transposition Cipher Route Cipher

9. Transposition Cipher Rail Fence Cipher

10. Transposition Cipher Columnar Transposition

11. Homework ? Develop a program for one of the ciphers above and use the following structure? string encode(string Plaintext, string key) {: return (Ciphertext); } string decode(string Ciphertext, string key) {: return (Plaintext); }