对差分 -线性密码分析方法进行推广 ,提出了截断差分 -线性密码分析方法 .对 9-轮和 11-轮 DES( dataencryption standard)密码算法的分析表明 ,该方法具有更加方便、灵活 ,适用范围更广的特点 .同时 ,利用截断差分 -线性密码分析方法得出 ,在类似 DES结构的算法中 ,S-盒的摆放顺序对密码的强度有较大的影响 .由此 ,截断差分 -线性分析方法给出了优化 S-盒排序的一种参考判别准则 The method of truncated difference-linear cryptanalysis is proposed by generalizing the difference-linear cryptanalysis method.The analysis of the 9-round and 11-round DES (dataencryption standard) cipher algorithm shows that the method is more convenient, flexible and applicable In the meanwhile, using the truncated difference-linear cryptanalysis method, we can see that in the algorithm similar to DES structure, the order of S-boxes has a greater impact on the strength of the password.Thus, truncated differential-linear analysis The method gives a reference criterion for optimizing S-box ordering