Flaws in generic watermarking protocols based on zero-knowledge proofs

Authors:
Raphael C. -W. Phan;Huo-Chong Ling
Affiliations:
Information Security Research (iSECURES) Lab, Swinburne University of Technology (Sarawak Campus), Kuching, Malaysia;Center for Cryptography & Information Security (CCIS), Faculty of Engineering, Multimedia University, Cyberjaya, Malaysia
Venue:
IWDW'04 Proceedings of the Third international conference on Digital Watermarking
Year:
2004

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Abstract

Recently, two generic watermarking protocols were proposed, based on a popular zero-knowledge identification protocol. In this paper, we show that both protocols are flawed and therefore fail to achieve their purpose of allowing a prover to prove to a verifier of his ownership of a watermarked image. We also give some suggestions to fix these flaws.