HADI soleimany - information system and security lab ISSL
alireza sharifi - information system and security lab ISSL
behnam bahrak - information system and security lab ISSL
mohammadreza aref - information system and security lab ISSL

A specific class of differential cryptanalytic approach , known as related key impossible differential attack , has been successfully applied to several symmetric cryptographic primitives in particular encryption schemes such as advanced encryption standard AES. in this paper we propose a new related -key impossible differential attack on 7-round AES-128 which is the first attempt using this technique. we haveattacked 7-round AES-128with the time complexity of 2 105 , the fastest attack of all the previous ones from time and precomputation compexities points of view.

AES-128,related-key differentials cryptanalysis , impossible differential.