摘要： 对分组密码SIMECK32/64算法抗不可能差分分析的能力进行研究,利用中间相遇技术,构造该算法的11轮不可能差分路径。采用向前解密4轮以及向后加密4轮进行19轮不可能差分分析攻击。分析结果表明,该路径只需要猜测29 bit子密钥,并且与零相关线性分析相比,针对SIMECK32/64算法的不可能差分攻击的分析复杂度大幅减小。

关键词: SIMECK算法, SIMON算法, SPECK算法, 不可能差分分析, 路径

Abstract: This paper studies the capability of impossible differential cryptanalysis on block cipher SIMECK32/64.The 11-round impossible differential path of SIMECK32/64 is constructed using the meet-in-the-middle technology.The attack on 19-round SIMECK32/64 is analyzed by adding 4 rounds on the top and 4 rounds at the bottom.The analysis result shows it only needs to guess 29 bit sub key,and it also verifies that the complexity of SIMECK32/64 algorithm with the impossible differential cryptanalysis is greatly reduced than that of zero correlation linear cryptanalysis.

Key words: SIMECK algorithm, SIMON algorithm, SPECK algorithm, impossible differential cryptanalysis, route

中图分类号: 

• TP309.7