混沌分组密码抗差分密码攻击的分析  

Analysis on Anti-differential Cryptanalysis Attack of Chaotic Block Cipher based on Feistel Structure

作　　者：郑晓丽[1] 姜迪刚[2] 

机构地区：[1]军事体育进修学院,广东广州510500 [2]中山大学基础医学院,广东广州510080

出　　处：《通信技术》2013年第1期40-42,59,共4页Communications Technology

摘　　要：混沌系统具有良好的伪随机性、混频特性、对初始状态的敏感性和复杂的映射参数等特性,这些特性与密码学要求的产生伪随机信号、混乱和扩散、加、解密密钥的难以预测等属性是十分吻合的。近些年来,不少学者提出了多种基于混沌理论的密码算法,但对其安全性并没有详尽的分析。针对一种较新的基于Feistel结构的混沌分组密码,应用不可能差分的分析方法,在固定S盒的情况下对其安全性进行了分析,并在动态S盒的情况下说明了其安全性所在。Chaotic system has such fairly good features as pseudo-randomness, frequency mixing, sensitivity of the initial value, and complex mapping parameters, and these features are perfectly coincident with the crypto requirements, including the production of pseudo-random signal, chaos and diffusion, the unpredictability of encryption/decryption keys. In recent years, many scholars put forward various crypto algorithms based on chaos theory, but there is no detailed security analysis on these algorithms. Aiming at a new chaotic block cipher based on Feistel structure and under the condition of fixed S-box, the impossible differential analysis is used for its security, and where its security arises under the dynamic S-box is also explained.

关 键 词：混沌分组密码 扩展Fei stel结构 不可能差分 动态S盒 

分 类 号：TN929.5[电子电信—通信与信息系统]