ARIA — Why Have One S-Box, When You Can Have Two?

ARIA was designed in 2003 is a block cipher. It uses substitution (S-box) and permutation (P-box) network structure based on AES. As with AES it uses a 128-bit block size, and key sizes of 128 (12 rounds), 192 (14 rounds), or 256 bits (16 rounds). It differs from AES in that it uses two 8×8-bit S-boxes and their inverses for each of the alternate rounds (whereas AES only uses one set of S-boxes).

A core strength of AES (Rijndael) is the usage of the S-box and where we scramble bytes through the encryption process, and then unscramble them for…