大容量 MP3 比特流音频隐写算法

通过对MP3编解码算法原理的研究,提出了一种基于小值区哈夫曼编码特点的信息嵌入方法--码字映射替换规则,进而实现了一种能在MP3压缩文件的比特流中隐藏大量信息的盲检测隐写算法.算法先对载体mp3文件部分解码,搜索出适合嵌入的小值区码字,然后按规则修改比特流中的相应码字来嵌入秘密信息.实验结果表明,算法的容量高于MP3Stego,计算复杂度低,同时可保证不可感知性,并具有一定的不可检测性,能抵抗针对MP3Stego的隐写分析算法.

High Capacity Audio Steganography in MP3 Bitstreams

This work presents a blind information hiding method for MP3 compressed bitstreams based on the characteristics of the Huffman coding tables of the countl region. The proposed algorithm first partly decodes the cover mp3 file to search for the appropriate codewords in countl regions, and then embeds the secret information by modifying the corresponding codewords in the cover signal. Compared to the famous information hiding software MP3Stego, the proposed algorithm can obtain higher hidden data capacity with lower computational complexity. Furthermore, its imperceptibility is good and it can resist such steganalysis methods proposed to detect MP3Stego steganography.