Advanced Encryption Standard (AES) Implementation

Abstract

The thesis includes the complete step by step implementation of Advanced Encryption Technique, i.e. encrypting and decrypting 128 bit data using the AES and it’s modification for enhanced reliability and security. The encryption process consists of the combination of various classical techniques such as substitution, rearrangement and transformation encoding techniques. The encryption and decryption modules include the Key Expansion module which generates Key for all iterations. The modifications include the addition of an arithmetic operation and a route transposition cipher in the attacks iterative rounds. The Key expansion module is extended to double the number of iterative processing rounds in order to increase its immunity against unauthorized attacks.