基于二维超混沌映射的单向Hash函数构造

One-way Hash function construction based on two-dimensional hyper-chaotic mappings

快速有效的单向Hash函数的设计是现代密码学研究的一个热点.提出了一种基于二维超混沌映射的单向Hash函数的构造方法.该方法将原始输入报文按字节进行线性变换以及混沌映射,在所产生的混沌序列中选值作为二维超混沌映射的初始值,对迭代后所得的超混沌信号经过调制构造单向Hash函数.实验与分析结果表明,这种构造方法实现简单、对初值有高度敏感性、具有很好的单向性、弱碰撞性和保密性能.

The design of an efficient one-way Hash function with good performance is a hot spot in modem cryptography researches. In this paper, a Hash function construction method based on two-dimensional hyper-chaotic mappings is proposed. The initial values of the two-dimensional hyper-chaotic system come from the chaotic sequence, produced by a series of operations including chaotic mappings and linear transformation based on the plain text, and then modulates the signals resulting from the iteration of the hyper-chaotic system to construct a one-way Hash function. Simulation and analysis demonstrate that the new method has the merit of convenience, high sensitivity to initial values, good Hash performance, weak collision property, and better security.