Enhancing Security of AES Using Key Dependent Dynamic Sbox

Abstract

Nowadays most of the data transmission is done through digital communication and hence security and efficient data transmission is always a desirable property for any data communication. At present, Advance encryption standard (AES) is most widely used cryptographic technique. This AES uses static s box for encryption and decryption which remains constant irrespective of the key. Numerous analysts have experimented and revealed that there are some weak points [1] in the static s-box as it is static and known to all. Therefore, in our proposed algorithm we modify AES such that it uses dynamic sbox which is key dependent and compare the avalanche effect of basic AES with our proposed algorithm.