基于耦合映像格子混沌系统的Hash函数构造

Hash Function Construction Based on Chaotic System of Coupled Map Lattice

针对Hash函数构造的需要,基于耦合映像格子混沌系统提出了一种新的Hash函数构造方法.该算法利用消息明文分组实现对混沌初值、混沌系统参数和耦合系数的调制,将消息明文分组变换后直接映射到耦合映像格子混沌系统的参数空间.理论分析和数值仿真表明,该文提出的新算法对混沌初值、混沌系统参数和耦合系数变化高度敏感,具有良好的单向性、置乱性和强的抗碰撞性.

A novel scheme for constructing Hash functions is proposed based on the chaotic coupled map lattice （CCML）. The initial value, the parameters and the coupled factor of the chaotic dynamical system are modulated by the message plain text blocks, which are mapped directly into the parameter space of CCML. Theoretic analysis and numerical simulation results show that the chaotic initial values, parameter and coupled factor of the CCML-Hash algorithm have high sensitivity. It has good performance such as excellent one-way property, confusion and diffusion characteristics, and strong collision resistance.