Fingerprinting long forgiving messages
Lecture notes in computer sciences; 218 on Advances in cryptology---CRYPTO 85
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CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
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INDOCRYPT '01 Proceedings of the Second International Conference on Cryptology in India: Progress in Cryptology
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IHW '01 Proceedings of the 4th International Workshop on Information Hiding
Anonymous Fingerprinting for Predelivery of Contents
Information Security and Cryptology --- ICISC 2008
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IEEE Transactions on Information Forensics and Security
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Computer Communications
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Fingerprinting schemes support copyright protection by enabling the merchant of a data item to identifythe original buyer of a redistributed copy. In asymmetric schemes, the merchant can also convince an arbiter of this fact. Anonymous fingerprinting schemes allow buyers to purchase digital items anonymously; however, identification is possible if theyre distribute the data item. Recently, a concrete and reasonably efficient construction based on digital coins was proposed. A disadvantage is that the accused buyer has to participate in anyt rial protocol to deny charges. Trials with direct nonrepudiation, i.e., the merchant alone holds enough evidence to convince an arbiter, are more useful in real life. This is similar to the difference between "normal" and "undeniable" signatures. In this paper, we present an equallye fficient anonymous fingerprinting scheme with direct non-repudiation. The main technique we use, delayed verifiable encryption, is related to coin tracing in escrowed cash systems. However, there are technical differences, mainlyt o provide an unforgeable link to license conditions.