时空混沌序列在语音保密通信中的应用

Speech secure communications using spatiotemporal chaotic sequences

分析了单向耦合映象格子系统生成的时空混沌序列 .针对序列分布的不均匀性 ,研究了一种新的生成算法 .并通过理论分析 ,验证了该改进算法产生的混沌二值序列具有良好的伪随机性、敏感性和重复性 ,适合应用于保密通信领域中 .最后利用TMS32 0C62 0 1EVM目标板 ,对语音信号成功地进行了加密和解密实验 .实验结果表明本文方法恢复的语音信号精度高、难于破解 ,并揭示了时空混沌序列和DSP芯片在语音保密通信中具有广泛的应用前景 .

Spatiotemporal chaotic sequences generated from one-way coupled map lattice (OC OML) system are analyzed. In view of the non-uniformity of sequences distributi on, a new generation algorithm is studied. Theoretical analysis shows that chaot ic binary sequences generated from the improved algorithm have good characterist ics of pseudorandom property, sensitivity and repetition property, which make th em fit for secure communications. Finally based on TMS320C6201 EVM board, experi ments on encrypting and decrypting speech signals are successfully carried out. Experimental results show that the speech signals recovered by the proposed algo rithm have good quality and little chance to be decoded. In addition, all t he results indicate that the spatiotemporal chaotic sequences and DSP chip have wide application prospects in secure communications.