研究AES-256抵抗相关密钥-不可能差分密码分析的能力.首先给出相关密钥的差分,该差分可以扩展到8轮(甚至更多轮)子密钥差分;然后构造出一个5.5轮的相关密钥不可能差分特征.最后,给出一个对7轮AES-256的攻击和4个对8轮AES-256的攻击.
In this paper, the strength of AES-256 against the related-key impossible differential attack is examined Firstly, a carefully chosen relation between the related keys is presented, which can be extended to 8-round (even more rounds) subkey differences. Then, a 5.5-round related-key impossible differential is constructed. Finally, an attack on 7-round AES-256 and four attacks on 8-round AES-256 are presented.