A generalized method for constructing and proving zero-knowledge watermark proof systems

Authors:
Xianfeng Zhao;Yingxia Dai;Dengguo Feng
Affiliations:
The State Key Laboratory of Information Security, Graduate School of Chinese Academy of Sciences, Beijing, P. R. China;The State Key Laboratory of Information Security, Graduate School of Chinese Academy of Sciences, Beijing, P. R. China;The State Key Laboratory of Information Security, Graduate School of Chinese Academy of Sciences, Beijing, P. R. China
Venue:
IWDW'04 Proceedings of the Third international conference on Digital Watermarking
Year:
2004

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Abstract

Zero-knowledge watermark proof systems for copyright verification are not only theoretically appealing but also practically possible. However, most existing proposals concentrate on specific skills and neglect to give a formal proof of their zero-knowledge property. To improve the situation, the paper proposes a generalized framework for constructing and validating such systems. First, the theoretical foundations are investigated. Second, the paper shows that the existence of a secured equivalent operation, which enables watermark detection in a blinded domain, is one of the prerequisites of the systems' existence. In this view, the paper constructs a generalized zero-knowledge watermark proof system and verifies its zero-knowledge property. Third, the existing systems are investigated under the above framework, and a new system, which overcomes some defects of the existing ones, is proposed as a concrete instance of applying the generalized methods.