一种基于LWT和混沌加密的音频水印算法

摘要

Aiming at the problem that the robustness and security of current watermarking need to be further improved,a audio watermarking algorithm based on lifting wavelet transform(LWT)and improved logistic chaotic encryption is proposed by using the advantages of low complexity and fast computation of wavelet transform.The robustness of the watermark is enhanced by the statistical mean of the LWT coefficients,the safety of the watermark is improved by the improved logistic chaos encryption, and the embedding strength is determined by the human auditory characteristics,to ensure the transparency of the watermark. The results show that the algorithm has better transparency,robustness and security,and it shows a strong robustness to common signal processing attacks.%针对目前水印的鲁棒性和安全性有待进一步提高的问题,利用提升小波变换(LWT)复杂度低、计算速度快的优点,提出了一种基于提升小波变换和改进logistic混沌加密的音频水印算法,选择在LWT系数的统计均值嵌入同步信号和水印信息,增强了水印的鲁棒性,使用改进logistic混沌序列对水印进行加密,提高了水印的安全性,同时根据人类听觉特性自适应确定嵌入强度,保证水印的透明性.实验结果表明,该算法具有较理想的透明性、鲁棒性和安全性,对常见的信号处理攻击表现出较强的鲁棒性.