【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。更多还原

【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.更多还原