Abstract: Aiming at the problem in real-time speech secure communication system, which is attacked by self-adaptive synchronization control method because of no-load condition key leakage, a new scheme adopting cascaded chaotic system to encrypt the audio’s frequency domain is proposed. The scheme can avoid key leakage, therefore attacks based on self-adaptive synchronization control method can be effectively resisted. The test and analysis results of system indicate that this scheme is more effective and safer than the encryption method in time domain based on single chaotic system.

Key words: speech communication, chaos, Fourier transform, frequency domain encryption

摘要： 针对现有语音实时保密通信系统中系统空载密钥泄漏现象导致容易遭受基于自适应同步控制方法攻击的问题，采用混沌级联对语音频域进行实时加、解密。该方案实现零密钥泄漏，有效抵御了基于自适应同步控制方法的攻击。系统测试分析结果表明，该方案是有效、安全的，优于基于单组混沌系统对时域的加密方法。

关键词: 语音通信, 混沌, 傅里叶变换, 频域加密

CLC Number: 

• TP309.7