Abstract: Through the research to chaotic sequence characteristics, a method of speech signal encryption by combining Chebyshev chaos mapping with Logistic chaos mapping to be the chaotic key is put forward, which overcomes the shortcomings of lower security caused by simple key when traditional chaotic sequence encrypting. On the basis of generating more-parameters chaos key, speech signal encryption transmission system is constructed for signal encryption, modulation, and signal demodulation and decryption simulation processing in the receiver. The experimental results show that the application of this method increases the number of key parameters and encryption system has higher security and confidentiality performance, which is better applied to encryption communication.

Key words: chaos maps, oversampled Chebyshev maps, oversampled Logistic maps, encrypt, system simulation

摘要： 通过对混沌序列特性的研究，提出一种基于过抽样Chebyshev、Logistic混沌映射相结合为混沌密钥的方法对语音信号进行加密处理，克服了传统混沌序列加密时密钥简单造成安全性较低的缺点。在生成多参数混沌密钥的基础上，构建语音信号加密传输系统实现信号加密、调制，并在接收端实现信号解调和解密仿真过程。实验结果证明，该方法的应用使混沌密钥参数增加为多个，使得加密系统拥有更高的安全及保密性能，可以更好地应用于加密通信中。

关键词: 混沌映射, 过抽样Chebyshev映射, 过抽样Logistic映射, 加密, 系统仿真