一种基于混沌系统的窄带超低速语音加密算法  

Ultralow Bit Rate Speech Ciphering Communication Algorithm Based on Chaotic System

作　　者：朱晓晶[1] 李晔[2] 崔慧娟[1] 唐昆[1] 

机构地区：[1]清华大学微波与数字通信技术国家重点实验室,北京100084 [2]山东省计算中心,山东济南250014

出　　处：《现代电子技术》2010年第7期128-130,134,共4页Modern Electronics Technique

基　　金：国家自然科学基金资助项目(60572081)

摘　　要：为了在极低通信速率信道中实现保密语音通信,在北大西洋公约组织的0.6 Kb/s增强型混合激励线性预测声码器算法基础上,提出了基于混沌映射的保密通信算法。算法利用两个Logistic方程产生混沌序列,对声码器码流进行置换和移位。最后对该加密语音通信系统进行了仿真测试。测试结果证明,系统方案切实可行,产生的密钥空间大,能够实现加密强度较高的语音保密通信。In order to realize the secret speech communication in an ultralow bit rate channel,a communication algorithm based on chaotic mapping and 0.6 Kb/s mixed excitation linear predictive speech coding algorithm standardized by North Atlantic Treaty Organization（NATO） is proposed.The chaotic series generated by two logistic equations are used for permutation and displacement for the coding bits of the speech coder.Simulation tests are carried out on this secret speech communication system.The results show that it can generate large key space and is applicable for high intension secret speech communication.

关 键 词：混沌加密 LOGISTIC映射 语音编码 密钥空间 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]