本发明的隐写分析方法属于信息安全领域中信息隐藏技术的一种。方法通过检测语音载体中是否含有秘密信息，用于对抗量化索引调制(QIM，Quantization Index Modulation)隐写术的非法使用。本发明以G.723.1语音编码器为载体，针对QIM隐写方法进行检测。方法在对G.723.1语音编码矢量量化过程中，QIM隐写前后，码字索引值分布特性的变化进行分析的基础上，进行两项工作：(1)通过对索引的分布和转移概率矩阵进行量化，使用主成分分析法进行降维处理，得到维数较低的特征向量，并通过实验验证了降维后的特征向量仍对QIM隐写灵敏；(2)将提取的特征向量作为支持向量机(SVM，Support Vector Machine)分类器的输入，针对不同类别的语音样本进行实验，通过大量样本训练分类器，进行隐写分析实现与性能分析。
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