Saturday 23rd of September 2017
 

On the Limits of Perfect Security for Steganographic System


Khan Farhan Rafat and Muhammad Sher

Until now the discussion on perfect security for steganographic systems has remained confined within the realm of mathematicians and information theory experts whose concise and symbolic representation of their philosophies, postulates, and inference thereafter has made it hard for the nave reader to have an insight of the concepts. This paper is an endeavor not only to appraise on the limitations of one of such pioneer comprehensions but also to illustrate a pitfall in another scheme that asserts on having perfect security without the use of public or secret key. Goals set are accomplished through contrasting test results of a steganographic scheme that exploits English words with corresponding acronyms for hiding bits of secret information in chat - a preferred way to exchange messages these days. The misapprehension about perfect security and reign in characteristic of stego key in bit embedding process are unfolded respectively by launching elementary chosen-message and chosen-cover attack, and through proposed enhancement of target scheme.

Keywords: Perfect Security, Information Theoretic Security, Information Hiding, Steganographic Model, Oblivious Communication

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ABOUT THE AUTHORS

Khan Farhan Rafat
KHAN FARHAN RAFAT is a Ph.D. Scholar at International Islamic University, Islamabad Pakistan. He did his MCS from Gomal University, D.I.K. followed by MS in Telecommunication Engineering from UMT, Lahore Pakistan. As a veteran of information security with almost 24 years of experience he has worked in varied roles in areas not limited only to programming, evaluation & analysis of Software/Hardware based security solutions, and formulating security policies.

Muhammad Sher
Professor Dr. Muhammad Sher is Dean Faculty of Basic and Applied Sciences at International Islamic University, Islamabad Pakistan. He received B.Sc. degree from Islamia University Bahawalpur and M.Sc. degree from Quaid-e-Azam University, Islamabad, Pakistan. His Ph.D. is from TU Berlin, Germany in Computer Science and Electrical Engineering. His area of research is Next Generation Networks Security. An eminent Scholar who has a number of research publications to his credit.


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