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Research Journal of Information Technology
  Year: 2013 | Volume: 5 | Issue: 3 | Page No.: 363-372
DOI: 10.3923/rjit.2013.363.372
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A New Steganography Algorithm against Chi Square Attack

V. Thanikaiselvan, K. Santosh, D. Manikanta and Rengarajan Amirtharajan

The Internet mostly uses insecure links, where information for communication is put to test through its open exposure to interception. As far as information is concerned, its safeguarding measures are of prime concern nowadays. Some solution to be discussed is how to pass the not to be disclosed message in a fashion that its subsistence is made unidentified to invaders. Stenography is a hiding mechanism where the charisma of the secret is veiled by infixing the same in cover files. Steganalysis is the field associated with steganography detection by all its attributes which has now acknowledged much notice from media, law enforcement etc. Chi square test is the one such statistical technique used for steganalysis. This paper purports an algorithm for embedding data within images such that the chi square test fails to detect the hidden information. Merits and demerits of the algorithm are also discussed. Simple LSB substitution along with proposed modified LSB substitution is discussed with the help of PSNR and Chi square value. Another algorithm called as IPMCS (Increased Probability of matching between Cover and Secret data) is introduced which can be used to improve the image quality in terms of PSNR. It is important to know that IPMCS works well only for those images whose PSNR value obtained after applying OPAP is below a threshold value. Stegnographers should obtain stego outputs which when seen from naked eye, are impossible to tell apart from their corresponding covers.
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How to cite this article:

V. Thanikaiselvan, K. Santosh, D. Manikanta and Rengarajan Amirtharajan, 2013. A New Steganography Algorithm against Chi Square Attack. Research Journal of Information Technology, 5: 363-372.

DOI: 10.3923/rjit.2013.363.372






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