基于Lorenz混沌加密的DWT音频水印算法

将混沌理论引入到音频水印系统的设计中，提出一种基于Lorenz混沌系统的小波域数字音频水印算法。先将图像水印进行Logistic混沌加密，再利用三维Lorenz混沌吸引子在一定初值条件下产生的矩阵二次加密图像水印。把加密后的水印图像作为载体嵌入到音频信号的小波域。因为高维混沌的系统结构更为复杂、不可预测性更强，若没有初始值便无法得到加密矩阵，因此保障了水印的安全性；而在水印检测时，只要提供混沌加密的密钥和产生加密矩阵的初始值，就可完成水印的提取。仿真实验采用多种攻击方法，证明此方法具有很强的安全性和鲁棒性。

An Algorithm Of Lorenz Chaotic Encryption Audio Watermarking Based on DWT

A methodology for increasing audio watermark robustness based on Lorenz chaotic system was presented. A binary image watermarking was encrypted by a chaotic sequence and a matrix which was generated by Lorenz chaotic attractor depending on the initial data. The digital encrypted image could be embedded in the original signal wavelet domain in the algorithm. Because the high-dimensional chaotic system structure was more complex and unpredictable, only having the initial value of the matrix could be encrypted, the security of the watermark was protected. As long as the chaotic encryption keys and the initial value were provided, watermark extraction could be completed in watermark detection. The experimental results using a variety of attack methods show that the watermarks are imperceptible and the algorithm is robust..