一种基于Feistel结构的混沌分组密码的抗差分密码攻击分析  

An Analysis of Anti-Differential Cryptanalysis Attack for Chaotic Block Cipher Based on Feistel Structure

作　　者：郑昊[1,2] 赵耿[2] 赵尔凡[1,2] 郑晓丽[3] 

机构地区：[1]西安电子科技大学通信工程学院,西安710071 [2]北京电子科技学院计算机科学与技术系,北京100070 [3]军事体育进修学院士官系保密法规教研室,广州510500

出　　处：《北京电子科技学院学报》2012年第2期60-66,共7页Journal of Beijing Electronic Science And Technology Institute

基　　金：国家自然科学基金资助项目(61170037);北京市自然科学基金资助项目(4092040)

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、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。因此近些年来,不少学者提出了多种基于混沌理论的密码算法,但对其安全性大多草草一笔带过,并没有详尽的安全性分析。本文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,分别在固定S盒、动态S盒两种情况对该算法进行了分析。分析结果表明,相比较于传统分组密码,该混沌分组密码能够更有效的抵抗差分密码攻击。Chaos system has many excellent properties, such as pseudo random,frequency mixing,sensitivity of the initial value, complex mapping parameters, these properties are consistent with the requirements of cryptography： producing pseudo -random signal, confusion and diffusion, difficulty to predict the keys. In recent years, many scholars proposed cryptographic algorithms based on chaos theory, but without detailed security analysis. In this paper, we use impossible differential cryptanalysis to analyze a new kind of chaotic block cipher based on Feistel structure with fixed S -box and dynamic S -box. The result shows that com- pared to traditional block cipher, the block cipher based on chaos is more effective against differential crypta- nalysis.

关 键 词：混沌分组密码 扩展Feistel结构 不可能差分 动态S盒 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]