混沌加密系统的保密性能

从混沌同步对参数失配敏感性的特点出发，探讨了基于自然混沌系统同步分解的混沌保密通信系统的保密性能，指出基于低维混沌系统的通信系统不具有高保密性，容易受自适应同步控制的攻击，针对这一缺陷，对一类基于离散时间混沌噪声发生器的混沌加密方法进行了研究，其加密器与解密器之间对参数匹配误差敏感性的特点能防止自适应同步控制的攻击，且实现简单，加密性能易于控制，均优于基于低维混沌系统同步分解的加密方法。

Security Property of Chaotic Encryption Systems

The measure of security of chaotic secure communication schemes based on the active passive decomposition of natural chaotic systems was discussed in the contents of its characteristics of sensitivity to parameter mismatches. The result shows that the chaotic secure communication schemes based on the decomposition of low dimensioinal chaotic systems are not secure enough to resist the attack of adaptive synchronization. A class of chaotic secure communicatioin schemes based on the chaotic noise generator, which can eliminate such defects, was studied. The scheme is found to have characteristics that can make adaptive synchronization attack invalid. The proposed scheme is easy to implement by circuits, and its level of security can be easily adjusted. These properties make it superior to the schemes based on the active decomposition decomposition of low dimensional chaotic systems.