Detection of Jsteg Hiding Using Image Statistical Model  

作　　者：WU Mingqiao ZHU Zhongliang JIN Shiyao 

机构地区：[1]School of Computer, National University of Defense Technology, Changsha 410073, China [2]Key Laboratory, Southwest Institute of Electron ＆ Telecom Techniques, Chengdu 610040, China

出　　处：《Chinese Journal of Electronics》2006年第1期165-168,共4页电子学报（英文版）

摘　　要：Jsteg is an open steganography software on Internet. It uses the LSB of DCT coefficients to hide secret information in image. Chi-square attack can detect sequential Jsteg hiding but it can＇t detect the random Jsteg hiding. This paper presents a new, fast steganalytic method for detecting Jsteg hiding which is more convenient than the Chi-square attack. This method can detect both the sequential Jsteg hiding and the random Jsteg hiding by using the statistical model of image. The AC coefficients of image are divided into two parts and the distribution of the statistic of the two parts is fitted by Laplacian. The mean of Laplacian is 0 that is proved by Hypothesis testing. The Pearson X^2 test is done to test goodness-of fit. Basing on this statistic mode~ our method can detect Jsteg hiding with high accuracy. The amount of embedding message can be estimated using linear regression. We test our method on hundreds of images with different amount of embedding.

关 键 词：STEGANALYSIS STEGANOGRAPHY Jsteg LAPLACIAN 

分 类 号：TN919.8[电子电信—通信与信息系统]