一种基于Feistel网络的反馈式分组混沌密码的研究  

Research on a Feedback Block Chaotic Cipher Algorithm Based on Feistel Network

作　　者：彭军[1] 张伟[2] 杨治明[1] 廖晓峰[3] 

机构地区：[1]重庆科技学院电子信息工程学院,重庆400050 [2]重庆教育学院计算机与现代教育技术系,重庆400067 [3]重庆大学计算机科学与工程学院,重庆400044

出　　处：《计算机科学》2006年第1期72-74,77,共4页Computer Science

基　　金：国家自然科学基金(60271019);教育部博士点专项基金(20020611007);重庆市科委应用基础研究项目基金(7370)

摘　　要：近年来,将混沌理论应用到信息安全已成为研究的一个热点。本文基于 Feistel 网络,提出了一种新颖的反馈式分组混沌密码算法。在该算法中,当前加密分组输出将影响下一明文分组要运行的轮数,而每一轮使用的 S-盒的序号与加密密钥有关,轮数及 S-盒的序号均由混沌映射动态生成。由于混沌的固有特性,使得加密系统变得更加复杂,更加难以分析和预测。实验结果表明,本算法具有优良的密码学特性,对明文和密钥以及混沌系统参数的细微变动都非常敏感,产生的密文随机性很好。对本算法的安全性进行了分析,结果表明它具有很高的抗穷举攻击的能力。In recent years, the application research of information security using chaos theory has become an area of active research. In this paper, we propose a novel feedback block chaotic cipher algorithm based on Feistel network. The output cipher text of current plaintext block affects the number of round that will be used in the next plaintext block and the no of S-box used by each round function is related to the secret key. The value of rounds and the sequence number of S-box are all generated dynamically by chaotic map. In addition, the nature features of chaos make the cryptosys- tern more complex and more difficult to be analyzed or predicted. Simulation results show that the proposed algorithm has excellent cryptographic properties, i. e. , the algorithm is very sensitive with respect to the small change of plaintext, secret key and the parameters of chaotic system, and the randomicity of eiphertext is very ideal. At last, the security of the algorithm is studied, and the result indicates that the algorithm proposed in this paper possesses higher ca- pability of resisting the brute-force attack.

关 键 词：FEISTEL网络 分组密码 混沌映射 混沌密码 反馈式 分组 密码算法 加密密钥 固有特性 信息安全 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构] TN918.1[自动化与计算机技术—计算机科学与技术]