变参数混沌同步保密通信方案设计

DESIGN OF CHAOTIC SYNCHRONIZED SECURE COMMUNICA-TION SCHEME WITH TIME-VARYING PARAMETERS

本文设计了基于 L orenz方程的变参数混沌同步保密通信方案 ,采用主动 -被动同步方式 .提出同步误差放大、基波缩减的方法 ,获取对参数变化敏感、互相关性小的加密变量 .应用参数微扰技术建立变参数的 L orenz方程 ,使基于混沌同步的参数估计的方法不能奏效 .计算机仿真结果表明 ,方案的同步特性优良 ,参数敏感性得到显著提高 ;安全性分析说明 ,方案能有效抵御基于相空间重构、噪声削减和基于混沌同步的参数估计的攻击 。

A chaotic synchronized secure communication scheme based on Lorenz equations using active-passive decomposition, with time-varying behavior, is designed in this paper. The methods to amplify the synchronized error and to decrease the cross correlation are proposed to generate the encryption variables which are very sensitive to parameters. Lorenz equations with time-varying parameters are established by applying parameter perturbation technique so that the scheme is safe to synchronization-based parameter estimation. The computer simulation results show that it has good synchronization properties while its sensitivity to parameters is raised greatly. It is secure since it has the capacity to resist chaotic unmasking, noise filter, and synchronization-based parameter estimation.