Publication Type

Journal Article

Version

publishedVersion

Publication Date

8-2008

Abstract

The buyer-seller watermarking protocol enables a seller to successfully identify a traitor from a pirated copy, while preventing the seller from framing an innocent buyer. Based on finite field theory and the homomorphic property of public key cryptosystems such as RSA, several buyer-seller watermarking protocols (N. Memon and P. W. Wong (2001) and C.-L. Lei et al. (2004)) have been proposed previously. However, those protocols require not only large computational power but also substantial network bandwidth. In this paper, we introduce a new buyer-seller protocol that overcomes those weaknesses by managing the watermarks. Compared with the earlier protocols, ours is n times faster in terms of computation, where n is the number of watermark elements, while incurring only O(1/lN) times communication overhead given the finite field parameter lN. In addition, the quality of the watermarked image generated with our method is better, using the same watermark strength.

Keywords

Buyer seller protocol, Buyer-seller watermarking, Communication overheads, Computational power, Finite field theory, Finite fields, Homomorphic property, Network bandwidth, Public key cryptosystems, Watermarked images

Discipline

Databases and Information Systems | Numerical Analysis and Scientific Computing

Publication

Advances in Multimedia

Volume

2008

First Page

1

Last Page

7

ISSN

1529-2371

Identifier

10.1155/2008/905065

Publisher

JAI Press

Copyright Owner and License

Authors

Additional URL

http://doi.org/10.1155/2008/905065

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