空域序列隐写图像的密钥估计算法*

在已知嵌入消息长度的条件下，隐写密钥可以看做消息嵌入的起始位。将图像像素划分为不同类点，通过分析信息嵌入和最低位置反对各类点的影响，得到图像嵌入信息部分和未嵌入信息部分的差异，最终设计了针对空域序列LSB(least significant bits)隐写图像的密钥估计算法。实验结果表明，该算法可对隐写密钥进行快速有效的估计。

Stego key estimation algorithm in spatial sequential image steganography

This paper focused on the problem of estimating the stego key, which could be considered as the beginning of the secret message under the condition that the message length was known. Classified the pixels into different kinds. Based on the analysis of the effects on different kinds of pixels message embedding and least significant bit plane flipping have, obtained the difference between the part with message and the part without message in image. And then devised the stego key estimation algorithm of spatial sequential LSB image steganography. The experiment shows that this algorithm can estimate the stego key effectively and quickly.