一种安全的数字音频水印方案

A Security Digital Audio Watermarking Scheme Based on Synchronization Technique

提出一种安全的数字音频水印算法,利用密钥生成的序列作为水印同步码,并在时间域嵌入同步码。水印信息采用分块结构化编码方式,水印分块中采用校验码机制,水印内容采用量化方式嵌入在小波变换域,水印分块在音频段中循环冗余嵌入方式,以抵抗同步攻击的能力。提出的算法不仅具有较好的不可感知性,对低通滤波、噪声、重量化、重采样、MP3压缩等信号处理具有较好的鲁棒性;同时对抵抗随机裁剪攻击、抖动攻击、时间延展等同步攻击具有很好的鲁棒性。

A security digital audio watermarking scheme is introduced, which uses a random sequence generated by private key as watermarking synchronization code and embeds the synchronization code in the time domain of audio signal. The block- structured coding is used in watermarking information, the check code mechanism is used in watermarking block, the sub- block watermarking is embedded in the wavelet transform domain. Experimental results show that the proposed scheme is in- audible and robust against common signals processing such as low-pass filtering, re-quantify, resample, MP3 compression and equalization etc, and is robust against desynchronization attacks such as random cropping, time scale modification, and jittering.