Reversible Watermarking with Subliminal Channel

Authors:
Xianfeng Zhao;Ning Li
Affiliations:
State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, China 100190;State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, China 100190
Venue:
Information Hiding
Year:
2008

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Abstract

With some difficulty in making more redundant capacity, only a symmetrically encrypted hash code is embedded in some reversible watermarking schemes, which makes it possible that a dishonest verifier fabricates legal contents. This paper shows that for reversible watermarking, by exploiting a subliminal channel, only a capacity of several more bytes than the length of a hash code is needed to embed a longer public-key signature. Only 4 bytes more suffices in the research. To exemplify the idea, the paper gives a variant of the R-S watermarking scheme. The variant adopts the broad-band subliminal channel in RSA-PSS signature scheme. The analysis and experiments show that with the aid of the channel it is easier to implement the reversibility, localize the tampering, and so forth.