Abstract: A new method is proposed through analyzing Steganographic method of MP3Stego deeply. By comparing quantization steps before and after the operation of Steganography， it is found that after the operation， the quantization steps between adjacent particles would have greater volatility and its variance increases obviously. The difference statistics of quantization steps are extracted as the detection feature. Then Support Vector Machine is applied to realize the Steganalysis. Experimental results show that the proposed Steganalytic analysis method has good detection accuracy and detection performance.

Key words: MP3Stego, Steganalysis, quantization steps

摘要： 通过深入剖析MP3Stego隐写原理，提出了针对MP3Stego隐写检测的新方法。该方法对MP3Stego隐写操作后与隐写之前的量化步长进行对比研究，发现相邻颗粒之间量化步长会比未隐写时有更大的波动，其方差值明显的增大。利用此变化提取检测特征，经重压缩校正后通过模式分类进行隐写分析，实现了对MP3Stego的隐写检测。实验结果表明，所提出的隐写分析方法具有较好的检测准确率和检测性能。

关键词: MP3Stego, 隐写分析, 量化步长