Enhancing AES using Novel Block Key Generation Algorithm and Key Dependent S-boxes

Abstract

Security is one of the vital aspects of data communication, a wide acceptance of AES shows its superiority in providing confidentiality to secret information. Several algorithms have been proposed in recent times to modify the static nature of S-boxes used in AES. All these algorithms use same secret key to encrypt each plain text block. This paper presents a novel Block key generation algorithm in synchrony with dynamic S-box generation algorithm to generate considerably more unpredictable cipher texts in comparison to existing dynamic S-box generation techniques. Each plain text block is encrypted using entirely different block key generated from the secret key, which in turn generates non identical S-boxes to encrypt each plain text block. The proposed algorithm revamps the cryptographic strength of original AES by eliminating any possibility of cryptanalysis, and is both reliable and easy to implement.