新型数字混沌密钥序列发生器的周期扩展方法及实现  

Period extension method and its implementation for a new type of digital chaotic key sequence generator

作　　者：丁群[1] 王路[1] 

机构地区：[1]黑龙江大学电子工程学院,哈尔滨150080

出　　处：《仪器仪表学报》2011年第10期2316-2323,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(60672011;61072072)资助项目

摘　　要：混沌的良好统计特征和初值的敏感性适合加密系统设计,但由于数字混沌是在有限精度下进行的,导致混沌系统特性的退化,尤其是输出序列呈现出周期性,不利于加密系统组建。针对数字混沌序列的短周期现象提出改进方案,这种新系统输出的序列周期可根据加密需要进行设定,弥补数字混沌短周期现象,并有更加良好的抗多径干扰与多址干扰的能力。使数字混沌密钥序列发生器可安全应用到加密系统中。根据理论,利用FPGA设计了其硬件电路并应用在实际项目中。Chaos has good statistical characteristics and is sensitive to the initial value,which is appropriate for encryption system.Because digital chaos is conducted under the condition of finite precision,it will lead to the degradation of chaotic systems and the output sequence will appear periodicity,which is bad for encryption system.This paper proposes an improvement for the short period issue of digital chaotic sequence.The output sequence period of the new system could be set according to the requirement of the encryption,which remedies the short period issue of digital chaos and has better anti-jamming capability.With the proposed method,digital chaotic key sequence generator could be used in encryption system safely.According to the theory,a hardware circuit is designed based on FPGA and has been used in practical projects.

关 键 词：相关峰值间隔 有限精度 相关特性 混沌伪随机序列 

分 类 号：TN918.4[电子电信—通信与信息系统]