SBSSA异步模数模加密的原理与实现

SBSSA Asynchronous Analog-Digital-Analog Scrambling Method for Secure Speech Communication:Theory and Implementation

本文提出了子带扩谱混迭(SBSSA)模数模语音加密的一般思想。并给出了一种实用的实现方法。理论分析与模拟实验表明,这种方法可以工作在异步条件下,和L.s.Lee等人提出的不需要帧同步样点加密方法相比,可获得更高的保密性,且恢复话音没有非线性相位失真。

This paper proposes a new idea for analog-digital-analog speech scrambling for the first time, which is called Suband Spread Spectrum Aliasing method (SBSSA), and presents an available scheme to implement it. It is concluded by analysis and simulation results that the scheme offers higher security over other asynchronous analog-digital-analog scrambler (L. S. Lee's system), and it can work under asynchronous condition without non-linear phase distortion.