Preamble 1: Prehistory of Cryptography 1.1 Foundations of Conventional Cryptography 1.2 Roots of Modern Cryptography 1.3 The Shannon Theory of Secrecy 1.4 Exercises 2: Conventional Cryptography 2.1 The Data Encryption Standard (DES) 2.2 DES Modes of Operation 2.3 Multiple Encryption 2.4 An Application of DES: UNIX Passwords 2.5 Classical Cipher Skeletons 2.6 Other Block Cipher Examples 2.7 The Advanced Encryption Standard (AES) 2.8 Stream Ciphers...