一种基于Henon映射和Feistel结构的分组密码算法研究

混沌序列具有对初值和系统参数敏感等特点,因此非常适合应用于信息加密。本文在详细分析Henon映射的混沌和密码学特性的基础上,提出一种基于Feistel结构和Henon映射混沌分组密码算法,该算法最大的优点加密的轮次和子密钥的构造是基于混沌系统动态更新的,通过子密钥的动态生成,密码系统的随机性、复杂性得到了极大的提高。同时理论和实验表明,该算法具有较高的安全性,能够抵抗差分和线性密码分析。

A Bock Cryptographic Algorithm Based on Henon Map and Feistel

As we all know, chaotic system is sensitive to initial values and system parameters, so it is suitable for in- formation encryption. In this paper, the chaotic and cryptographic properties of the 2-D Henon map is analyzed and a novel block chaotic cryptographic algorithm based on Feistel and Henon map is presented. The difference between the presented algorithm and traditional block algorithm is: the number of rounds is dynamically determined by the former ciphertext block, and the subkey also is dynandcally generated. The randomicity, complexity and robustness of cryp- tosystem can be greatly improved by employing a chaotic system within the process of generating the subkeys. At the same time, The results of the security analyses indicate that the algorithm can against the differential and linear at- tacks and with high security.