一种基于混沌序列的加密算法

An Encryption Algorithm Based on Chaotic Sequences

提出一种基于数字化混沌密码系统的改进算法.通过m序列随机改变混沌映射的参数克服混沌序列的有限状态问题.为了进一步提高输出混沌序列的随机统计特性,利用选择判据引入m序列的随机扰动,使混沌序列不断在各个子空间转换.经过扰动函数的输出混沌序列均匀分布在整个状态空间中.这种加密算法克服了有限精度的缺点,使输出序列的周期增大并可以度量.该方法可以产生具有良好统计特性的密钥流,便于软硬件实现.

An improved encryption algorithm based on digital chaotic coding system is proposed. The problem of finite state is resolved by changing the parameter of chaotic mapping using msequence. To further improve the random statistic property of output chaotic sequence, the chaotic sequence is made to transfer in various subspaces. The output chaotic sequence through the perturbation function distributes uniformly in the whole state space. This method overcomes the disadvantage of limited precision, increases the period of output sequence and makes it measurable. This method can produce a private key with good statistic property and is easy to implement.