一种混沌分组密码的设计及分析

Design and Analysis of A Chaos Block Encryption

S(Substitution) -盒是分组密码算法中关键的非线性变换 ,本文首先通过量化函数把混沌系统作用的无限域映射到S-盒作用的有限域 ,分析了量化状态的一些特性 ,然后提出一种利用混沌量化状态构造S盒的方法。这种方法充分利用了混沌系统良好的伪随机特性、轨道的不可预测性和系统对初始状态及控制参数的敏感性 ,大大提高了构造高强度S -盒的效率。统计检验的结果表明 。

This paper describes a formation method of substitution-box that is based on discrete time chaotic map in block encryption.Our method makes use of chaotic system that is characterized by the sensitivity on initial conditions,system parameters and unpredictability of evolution of its orbits.These properties make the chaotic systems a worthy choice for constructing substitution-box.We evaluate the statistical security of the block encryption.The results indicate that this block encryption,especially the substitution-box,is safe.