基于欠采样的混沌保密通信系统的保密性分析

The Encryption Analysis on the Chaotic System Based on Sub- Nyquist

在混沌保密通信过程当中,计算机控制、数值计算等导致连续系统的离散化。采样间隔对系统的非线性输出具有重要影响。本文运用非线性检验技术中的替代数据方法,对系统在欠采样间隔情况下的系统动力学特性进行分析。验证了在欠采样情况下,混沌系统维数越高、保密性越强的理论,为进一步利用非线性时间序列分析方法分析采样混沌系统提供了理论依据。

In the process of chaotic secure communication, because of the computer control and data calculation, a serial system becomes a discrete system. The sampling interval has important effect on the nonlinear output. It is proposed that using the surrogate data method to analyze the dynamic property of the chaos system in the case of sampling interval is large. At the same time, it presents that the higher the dimension is, the stronger the secure properties are. This paper provides the theory basis for further studying on the chaotic system.