基于广义混沌映射切换的单向Hash函数构造

如何设计快速高效的单向Hash函数一直是现代密码学研究中的一个热点.提出了一种基于广 义混沌映射切换的Hash函数构造方法.这种方法首先构建产生多种混沌序列的广义混沌映射 模型,然后在明文信息的不同位置根据切换策略产生不同的混沌序列,并用线性变换后的信号 信息对混沌参数进行调制来构造单向Hash函数.初步分析了利用混沌映射实现单向Hash函数 的不可逆性、防伪造性、初值敏感性等特点.研究结果表明:这种基于广义混沌映射切换的Ha sh函数具有很好的单向性、弱碰撞性，较基于单一混沌映射的Hash函数具有更强的保密性能 ，且实现简单. 关键词： Hash函数 混沌 混沌映射切换

One way Hash function construction based on the extended chaotic maps switch

How to design an efficient one-way Hash function is always the hot point in modern cryptography researches. In this paper, a Hash function construction method based on extended chaotic maps switch is proposed. The extended chaotic model is first built to generate various kinds of chaotic signals at different parts of the original signals according to the switching schemes, and then chaotic parameters of one-way Hash function is modulated by the linear-transformed signals. The advantages of irreversibility, resistance to imitations and sensitivity to initial values,etc., are also discussed. Simulation results show that this chaotic Hash function based on extended chaotic maps switch has good one-way,weak collision property, better security than the chaotic Hash function based on single chaotic map, and it can be realized easily.