Random S-Box generation in AES by changing irreducible polynomial

Abstract

The S-Box and Inverse S-Box in the tradition advance encryption standard is fixed and it is made by the composite field arithmatic to find the multiplicative inverse in the finite field GF (28). But in traditional AES the use of irreducible polynomial m(x) = x8+ x4 + x3 + x+1 to find out multiplicative inverse, is known to the attacker. So if we can make use of different irreducible polynomial every time to the finite field of GF (28) and send this the receiver combined with the secret key, then every time a new irreducible polynomial is used and a random S-Box is generated. Hence, the security of the algorithm is enhanced. In this paper, we devise an algorithm, which make use of different irreducible polynomial to finite field of GF (28) to make random S-Box and Inverse S-Box.