NDLI: Multiclass Detector of Current Steganographic Methods for JPEG Format

Content Provider	IEEE Xplore Digital Library
Author	Pevny, T. Fridrich, J.
Copyright Year	2005
Abstract	The aim of this paper is to construct a practical forensic steganalysis tool for JPEG images that can properly analyze single- and double-compressed stego images and classify them to selected current steganographic methods. Although some of the individual modules of the steganalyzer were previously published by the authors, they were never tested as a complete system. The fusion of the modules brings its own challenges and problems whose analysis and solution is one of the goals of this paper. By determining the stego-algorithm, this tool provides the first step needed for extracting the secret message. Given a JPEG image, the detector assigns it to six popular steganographic algorithms. The detection is based on feature extraction and supervised training of two banks of multiclassifiers realized using support vector machines. For accurate classification of single-compressed images, a separate multiclassifier is trained for each JPEG quality factor from a certain range. Another bank of multiclassifiers is trained for double-compressed images for the same range of primary quality factors. The image under investigation is first analyzed using a preclassifier that detects selected cases of double compression and estimates the primary quantization table. It then sends the image to the appropriate single- or double-compression multiclassifier. The error is estimated from more than 2.6 million images. The steganalyzer is also tested on two previously unseen methods to examine its ability to generalize.
Sponsorship	IEEE Signal Processing Society
Starting Page	635
Ending Page	650
Page Count	16
File Size	1272468
File Format	PDF
ISSN	15566013
Volume Number	3
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Steganography Image analysis Q factor Forensics System testing Feature extraction Support vector machines Support vector machine classification Transform coding multiclassifier Blind steganalysis double compression JPEG classifier
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Safety, Risk, Reliability and Quality

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