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Steganography algorithms based on JPEG images

Author: HeLiFang
Tutor: LiuGuangJie
School: Nanjing University of Technology and Engineering
Course: Detection Technology and Automation
Keywords: Information Hiding Digital steganography Steganalysis JPEG images Markov chain Statistical properties
CLC: TP309
Type: Master's thesis
Year: 2010
Downloads: 194
Quote: 1
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Abstract


Information Hiding is an important topic of current research in the field of information security , digital implicit writing as an important branch of information hiding technology , more and more widely attention of researchers . With steganography technology development for the existence of the hidden information detection image steganalysis achieved rapid development , it steganographic techniques contradictions mutual promotion and common development . This thesis focuses on the JPEG image , on the basis of summarizing the pros and cons of technology for the field research can better resist the digital image steganalysis steganography algorithms . Its main tasks are : ( 1 ) study the four common steganography algorithm based on JPEG images , and through experiments on JSteg, F5 , and the MB three kinds of hidden writing algorithm from steganographic capacity , embedding rate , utilization of vector data , vector data change rate , PSNR and DCT coefficients histogram characteristics were compared with analysis of the strengths and weaknesses of each algorithm . ( 2) study the existing three typical generic implicit write based on the JPEG image analysis algorithms, and the papers mentioned JSteg , of F5 , OutGuess and MB Four steganography algorithms as a test object analysis . The experimental data show that the three steganalysis algorithm for the full embedding detection rate of greater than 90% , and has higher detection accuracy rate . The study results showed that the sensitivity is closely related to the the steganalysis algorithm performance characteristics of steganography operation . (3) Based on the statistical correlation between the block the JPEG coefficient between the intra-and inter-block , a steganographic JPEG images based on Markov chain algorithm . The algorithm uses the Markov chain step transition probability matrix and the pseudo-random sequence to determine the The LSB matching DCT coefficients modify rules to minimize the secretive information vector image block . Experiments show that , compared with several other mainstream JPEG steganography algorithms , steganography capacity is relatively large , the peak higher signal-to-noise , and a good way to keep the carrier DCT coefficients histogram statistical properties . Write analytical capabilities from anti implicit point of view, compared to several other steganography algorithms have improved to some extent . Finally, the paper summarizes the inadequacies exist , and points out the future research directions .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality
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