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• W2135280214 abstract "<para xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> 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. </para>" @default.
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• W2135280214 date "2008-12-01" @default.
• W2135280214 modified "2023-10-18" @default.
• W2135280214 title "Multiclass Detector of Current Steganographic Methods for JPEG Format" @default.
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• W2135280214 doi "https://doi.org/10.1109/tifs.2008.2002936" @default.
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