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

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

Substitution Cipher Caesar Cipher

Substitution Cipher Tap Code

Substitution Cipher Pigpen Cipher

Substitution Cipher Vigenère Cipher

Substitution Cipher Codebook Cipher

Transposition Cipher Route Cipher

Transposition Cipher Rail Fence Cipher

Transposition Cipher Columnar Transposition

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); }