Information-theoretic analysis for the difficulty of extracting hidden information
Wuhan University Journal of Natural Sciences2005Vol. 10(1), pp. 315–318
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Abstract
The difficulty of extracting hidden information, which is essentially a kind of secrecy, is analyzed by information-theoretic method. The relations between key rate, message rate, hiding capacity and difficulty of extraction are studied in the terms of unicity distance of stego-key, and the theoretic conclusion is used to analyze the actual extracting attack on Least Significant Bit (LSB) steganographic algorithms.
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