Abstract
Anonymity is one of important requirements for electronic marketplaces to offer similar privacy as current marketplace. Unfortunately, most watermarking protocols in the literature have been developed without considering a buyer’s anonymity. It would be unsatisfactory for the buyer to reveal his/her identity to purchase multimedia contents. In this paper we propose an anonymous buyer-seller watermarking protocol, where a buyer can purchase contents anonymously, but anonymity control is provided, i.e., a seller can trace the identity of a copyright violator. The proposed scheme also provides unlinkability of contents purchased by a buyer. Another distinct feature of our scheme is that the identification of an illegal buyer is accomplished in a way such that the seller can directly convince a judge that the buyer has redistributed contents. This feature removes any possibility of dispute. Furthermore, when the innocent buyer is falsely accused by a malicious seller, it is possible to prove his/her innocence without attending a court and revealing any privacy.
This work was supported by grant No.R 01-2001-000-00537-0 (2002) from the Korea Science & Engineering Foundation.
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Soo Ju, H., Jeong Kim, H., Hoon Lee, D., In Lim, J. (2003). An Anonymous Buyer-Seller Watermarking Protocol with Anonymity Control. In: Lee, P.J., Lim, C.H. (eds) Information Security and Cryptology — ICISC 2002. ICISC 2002. Lecture Notes in Computer Science, vol 2587. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-36552-4_29
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