A new steganalytic algorithm for detecting jsteg

Authors:
Mingqiao Wu;Zhongliang Zhu;Shiyao Jin
Affiliations:
School of Computer, National University of Defense Technology, Changsha, China;Key Lab, Southwest Institute of Electron & Telecom Techniques, Chengdu, China;School of Computer, National University of Defense Technology, Changsha, China
Venue:
ICCNMC'05 Proceedings of the Third international conference on Networking and Mobile Computing
Year:
2005

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Abstract

Jsteg is an open steganography software on Internet. It uses the LSB of DCT coefficients to hide secret information. This paper presents a new, fast steganalytic method for detecting Jsteg hiding which is more convenient than the Chi-square attack. 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 χ2 test is done to test goodness-of fit. Basing on this statistic mode, our algorithm can detect Jsteg hiding with high accuracy. The amount of embedding message can be estimate using linear regression.