基于统计特征的音频中隐藏信息估计方法

Estimation of Secret Message in Audio Based on Statistic Characteristics

该文基于信息嵌入不同位平面所引起的幅度统计分布变化,提出了一种音频中隐藏信息长度估计方法。通过该方法,不仅可以判别未知音频中是否包含隐藏信息,而且还能有效识别信息嵌入位平面和较精确地估计隐藏信息长度。该方法已在微机上进行了实验,实验结果表明,该方法识别正确率较高,隐藏信息长度估计较精确,可有效用于音频隐藏分析。

Based on the audio amplitude distribution change caused by secret message embedding in different bit-planes, a method of secret message length estimation is presented in this paper. This method can not only discriminate the existence of secret message, but also recognize the embedding bit-plane and estimate the amount of secret message. The proposed method has been implemented on PC. The experimental result shows its good recognition performance and relatively high estimation accuracy of secret message length. The proposed method can be used effectively in audio steganalysis.