X. F. Zhao, N. Li
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.
Cite the paper as:
 X. F. Zhao, N. Li. Reversible Watermarking with Subliminal Channel. In Revised Selected Paper of 10th International Workshop on Information Hiding (IH 2008), Santa Barbara, CA, USA, May 19-21, 2008, LNCS 5284: 118-131, Springer