7.1 Cryptography . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 7.1.1 Overview of Cryptography . . . . . . . . . . . 130 7.1.2 Symmetric-Key Cryptography . . . . . . . . 130 7.1.3 Substitution and Transposition Techniques . . . . . . . . . . . . . . . . . . . . . . . . . 131 7.1.4 Data Encryption Standard (DES) . . . . . 133 7.1.5 Advanced Encryption Standard (AES) . 134 7.1.6 Public...

Cryptographic algorithms are the most essential elements in designing the system security . Though there are numerous encryption systems used in security systems by various organizations, for the wider use, a particular encryption method is used as a standard. The internationally accepted and acclaimed algorithm is Advanced Encryption Standard. Here in this paper we have implemented the Advance...