基于扰动的混沌序列密码算法设计与研究

作者：胡治孝 日期：2010-06-21/span> 浏览：2899 查看PDF文档

基于扰动的混沌序列密码算法设计与研究
胡治孝
（杭州电子科技大学 计算机学院，浙江 杭州 310018）

摘要：有限精度效应(FPE)在很大程度上削弱了混沌密码系统的密码学特性，是近年来制约混沌密码学发展的瓶颈问题。针对FPE问题，分析了线性反馈移位寄存器(LFSR)与一维Logistic映射的混沌动力学特性，提出了一种基于二者的混沌序列密码算法。该算法采用伪随机序列扰动与密码反馈相结合的方法来改善加密效果。系统由软、硬件均可实现，在模拟实验中以软件为例，采用C++语言编写代码。实验结果表明，密文流在有限精度下具有良好的数学特性。密码系统较好地解决了FPE问题，具有实用价值。
关键词：混沌；序列密码；有限精度效应；扰动；反馈
中图分类号：TP309.7文献标识码：A文章编号：1001-4551(2010)03-0063-04

Design and research of a chaotic stream cipher based on perturbation

HU Zhixiao
(Department of Computer, Hangzhou Dianzi University, Hangzhou 310018, China)

Abstract: One major issue in digital chaotic cryptography is the numerical implementation, because of finite precision effect(FPE). Aiming at FPE, linear feedback shift register (LFSR) and onedimensional logistic map were analyzed first. Then a hybrid encryption algorithm based them was proposed, both pseudorandom sequences and cipher feedback were used to improve the algorithm. This system can be easily implemented by both software and hardware, software was taken for example. The simulation result shows that the cipher stream has a good mathematic character. The cipher system could solve FPE effectively and has a good practical value.
Key words: chaos; stream cipher; finite precision effect(FPE); perturbation; feedback