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| The Study of Security in Steganography Based on K-L Divergence |
| Song Hui①,Kong Xiang-wei①,You Xin-gang①② |
| ①School of Electronic and Information Engineering, Dalian University of Technology, Dalian 116024, China; ②Beijing Institute of Electronic Technology and Application, Beijing 100091, China |
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Abstract This paper presents a universality method for measure of security in steganography. According to the definition of K-L divergence and the properties of security in steganography, some limitations in Cachin’s definition of security are shown in the beginning. Besides the divergence of probability distributions between stego and cover, the sample size and the cardinality of the state set of random variable have great effect on security in steganography. Based on K-L divergence and hypothesis testing, an amended measure of security and a useful illation are presented. The result of examination can prove that the new measure of security is reasonable.
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Received: 04 February 2009
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Corresponding Authors:
Song Hui
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2010, Vol. 32 
