基于置乱和SCS技术的数字音频多重水印算法

基于置乱变换以及DWT（离散小波变换）和DCT（离散余弦变换）相结合的SCS（Scalar Costa Scheme）技术，提出一种可同时标识多个版权所有者（如不同的创作者、发行者或使用者等）的数字音频多重水印算法。该算法具有以下特点：（1）系统透明性良好，嵌入多个水印的音频文件没有人耳可察觉的听觉质量下降。（2）对噪声、低通滤波等常见信号攻击及恶意替换操作均表现出很强的鲁棒性。（3）后续嵌入水印时不需知道前次水印的嵌入位置。每个水印的嵌入位置只依赖于私人密钥，与算法无关。非法用户由于没有密钥，无法正确提取水印图像。（4）水印提取时不需提供原始音频载体和原始水印图像。（5）可以辨别水印嵌入的先后顺序，从而证明版权的唯一性。

Digital Audio Multi-Watermarking Algorithm Based on Amalgamation and SCS Technology

Based on scrambling and SCS technology ,this paper proposes a digital audio multi-watermarking algorithm which can mark different copyright owners. Its advantages are as follows： （1） Good transparency： the differences between the marked audio and the original audio signal are perceptually inaudible; （2） Robust to common signal attacks like noise adding and low-pass filtering as well as malicious substitution; （3） When a new watermark is embedded,it＇ s not necessary to know the positions of the foregoing watermarks. The embedding position of each watermark only depends on the private key so that the illegal user can not extract the watermark correctly; （4） Blind extracting; （5） It can judge the embedding order of each watermark.