摘要： ：多媒体数据的可信度经常受到置疑，没有法律效应，原因在于数字产品的可编辑性，需要一个安全的认证系统来确定其内容是否被伪造或特殊处理过。该文提出了一种音频内容认证系统，在原始音频的离散小波域中嵌入认证信息，采用相关检测。该算法在抵抗中等强度的MP3有损压缩、上下行采样等保持内容的音频信号处理的同时，能够检测出恶意篡改等攻击，并精确定位篡改位置，还能对被篡改的音频片段进行近似恢复。

关键词: 音频认证, 音频恢复, 相关性检测, 半脆弱水印

Abstract: A novel audio content authentication algorithm is proposed. The authentication message is embedded by modifying the DWT coefficients of the original audio without obvious perceptual degradation, and correlation-based method is adopted for detection. The algorithm can differentiate common content-preserving operations like MP3 compression, up and down resampling from malicious tampering, and precisely locate tampered positions and further approximately recover the modified audio clips.

Key words: Audio authentication, Audio recovery, Correlation-based detection, Semi-fragile watermark

中图分类号: 

• TN912.3