Practical Cryptography

5 DATA ENCRYPTION STANDARD

EZAZUL ISLAM AND SAIFUL AZAD

Contents

Keywords

5.1 Primitive Operations

5.1.1 Operations for Encryption/Decryption

5.1.2 Operations for Subkey Generation

5.2 Basic Structure

5.3 DES Encryption Algorithm

5.4 DES Decryption Algorithm

5.5 Implementation

5.5.1 C++ Library Headers

5.5.2 The DES Class

5.5.3 Introducing the Member Variables of DES Class

5.5.4 Introducing the Member Functions of DES Class

5.5.5 The Keygen() Function

5.5.6 The PermChoice1() Function

5.5.7 The Split_Key() Function

5.5.8 The PermChoice2() Function

5.5.9 The Encrypt(char *) Function

5.5.10 The IP() Function

5.5.11 The Expansion() Function

5.5.12 The xor_oneE(int round) Function

5.5.13 The Substitution() Function

5.5.14 The Permutation() Function ...