add_round_key.m AES.pdf aes_demo.m aes_init.m aff_trans.m cipher.m cycle.m disp_hex.m find_inverse.m inv_cipher.m inv_shift_rows.m key_expansion.m mix_columns.m poly_mat_gen.m poly_mult.m rcon_gen.m rot_word.m shift_rows.m sub_bytes.m s_box_gen.m s_box_inversion.m