1. An advanced encryption standard (AES) engine with real time S-box generation comprising: a Galois field multiplier system in a first mode responsive to a first data block for generating an AES selection (S-box) function by executing the multiplicative increase in GF 1 (2 m ) and applying an affine over GF(2) transformation to obtain a subbyte transformation; and a shift register system for transforming said subbyte transformation to obtain a shift row transformation; said Galois field multiplier system being responsive in a second mode to said shift row transformation to obtain a mix column transformation and adding a round key for generating in real time an advanced encryption standard cipher function of said first data block.