摘要： 介绍了最不重要比特(LSB)替换和LSB匹配2种典型的基于图像的信息伪装算法，阐述了两者的隐藏原理及优缺点。分类论述了各类隐写分析算法，分析其检测原理，给出了各类算法的适用范围和优缺点，对每类算法中的典型分析方法进行评价。根据信息嵌入过程对载体图像的影响分析得出LSB匹配信息伪装算法的安全性要高于LSB替换信息伪装算法的结论。指出了提高隐藏信息安全性的途径和努力方向。

关键词: 信息隐藏, 信息伪装, 隐写分析, LSB替换, LSB匹配

Abstract: This paper introduces two steganography algorithms based on image, LSB replace and LSB matching, expounds on these two algorithms’ hiding principle and explains their advantages and disadvantages. It expounds each sort of steganalysis, analyses their detecting principles, gives their applying range and features, and appraises the representative analyzing method of each algorithm. By analyzing the effect on the carrier image of the embedding process, it concludes that the security of the LSB matching is much higher than that of the LSB replace. It also points out the approach and direction to improve the security of information hiding.

Key words: information hiding, steganography, steganalysis, LSB replace, LSB matching

中图分类号: 

• TP309