A Variant of AES against Square Attack

Abstract

Since the “Square” attack was introduced by Joan Daemen, Lars R. Knudsen and Vincent Rijmen in 1997, its variants has been reported to go against 9 rounds of AES. We analyse the features of some cryptanalysis and try to find out what properties are used to attack block ciphers. We propose MAES, a modified version of AES, in order to have higher security level in prevention from the “Square” attack. Furthermore, we also compare the security levels between AES and MAES. Finally we prove that MAES provides higher security than AES.