动态密码结构抵抗差分密码分析能力评估  

Security evaluation against differential cryptanalysis for dynamic cryptographic structure

作　　者：王念平[1] 郭祉成 WANG Nianping;GUO Zhicheng(Information Engineering University,Zhengzhou 450001,China)

机构地区：[1]信息工程大学,河南郑州450001

出　　处：《通信学报》2021年第8期70-79,共10页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61672031)。

摘　　要：针对CLEFIA密码结构,提出一种动态密码结构,该动态密码结构的特点是第6t(t≥1)轮中的扩散层可以从{0,1}4上的多个线性双射中任意选取。通过对6轮差分特征的传递规律的分析,给出了动态密码结构中所有密码结构抵抗差分密码分析能力的评估结果。研究结果表明,在轮函数都是双射的条件下,当迭代轮数l为6k(k≥1)或6k+1(k≥3)时,l轮差分特征至少有l个活动轮函数,当迭代轮数为其他值时,l轮差分特征至少有l−1个活动轮函数。For CLEFIA cryptographic structure, a dynamic cryptographic structure was put forward. The main feature of the dynamic cryptographic structure was that the diffusion layer in the 6 t(t≥1)th round could be selected arbitrarily from some linear bijection on {0,1}4. By analysing the transfer law of 6-round differential characteristic, security evaluation against differential cryptanalysis for all structures of the dynamic cryptographic structure was given. The results show that, under the condition that the round functions are all bijective, there are at least l active round functions for l-round differential characteristic when l is 6 k(k≥1) or 6 k+1(k≥3), and otherwise there are at least l-1 active round functions for l-round differential characteristic.

关 键 词：动态密码结构 差分密码分析 活动轮函数 

分 类 号：TN918.1[电子电信—通信与信息系统]