一类分组密码的安全性能研究  

Researches on security of class of block ciphers

作　　者：王念平[1] 吴仕文[1] 

机构地区：[1]解放军信息工程大学电子技术学院,郑州450004

出　　处：《计算机工程与应用》2011年第17期81-82,86,共3页Computer Engineering and Applications

基　　金：现代通信国家重点实验室基金资助项目(No.9140C1102060702)

摘　　要：为评估一类分组密码的安全性能,通过列举的方法,对该分组密码抵抗差分密码分析的能力进行了深入的研究。在轮函数是双射的假设条件下,证明了3,4,6,9,12,4r轮分组密码分别至少有1,2,2,4,6,2r个轮函数的输入差分非零;从而若设轮函数的最大差分概率为p,则3,4,6,9,12,4r轮分组密码的差分特征的概率分别以p,p2,p2,p4,p6,p2r为上界。To evaluate the security of a class of block ciphers,the security analysis against differential attacks is investigated deeply using enumeration method.If the round function is bijective,then the number of active round function for 3,4,6,9,12, 4r -round ciphers is not less than 1,2,2,4,6,2r respectively.So the upper bounds of maximum differential characteristic prob- abilities for 3,4,6, 9, 12,4r-round ciphers are p,p^2,p^2,p^4,p^6,p^2r, if maximum differential probabilities for round function are p.

关 键 词：不平衡Feistel密码 轮函数 差分特征概率 

分 类 号：TN918.1[电子电信—通信与信息系统]