一种改进型的混沌密码算法

A Modified Chaotic Cryptographic Method

混沌密码算法是一种快速加密算法,在安全性要求较高的领域中,有着非常广阔的应用前景。文中在分析Baptista方法的基础上经过研究改进,对混沌编码算法,提出了一种基于迭代逻辑图的新方案。该方案充分考虑了编码对时间、密码特性等方面的要求,用一个参数来控制密文分布和编码时间,弥补了Baptista方法在编码时间和密码特性等方面的不足。仿真结果显示密文分布更合理,编码时间更短并且编码时间与文本文件的大小呈线性关系,增强了该算法的实用价值。

As a fast encryption algorithm, the chaotic cryptographic method has quite wide applications in the field of security. Based on the analysis of the Baptista method, we propose a modified version of the chaotic cryptographic method based on iterating a logistic map in this paper. The new method includes such considerations as encryption time and the distribution of the ciphertext. Moreover, the trade-off between the spread of the distribution of ciphertext and the encryption time can be controlled by a single parameter, supplied the major drawbacks of Baptista＇s approach. Simulation results show that the distribution of the ciphertext is flatter and the encryption time is shorter, the encryption time increases linearly with the file size, which made it more practical.