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Security Analysis and Improvement of an Anonymous Asymmetric Fingerprinting Scheme with Trusted Third Party  

Kwon, Sae-Ran (대림대학 컴퓨터정보계열)
Publication Information
Journal of KIISE:Computer Systems and Theory / v.36, no.5, 2009 , pp. 396-403 More about this Journal
Abstract
An anonymous asymmetric fingerprinting protocol combined with watermarking techniques, is one of the copyright protection technologies keeping both right of a seller and that of a buyer, where a seller and an anonymous buyer perform such a protocol that employs various cryptographic tools in order that the seller does not know the exact watermarked copy that the buyer receives, while inserting an invisible non-removable fingerprint i.e., each different unique watermark, into each copy of the digital content to be sold. In such a protocol innocent buyers are kept anonymous during transactions, however, the unlawful reseller is unambiguously identified with a real identity as a copyright violator. In 2007, Yong and Lee proposed an anonymous asymmetric fingerprinting scheme with trusted third party. In this paper we point out the weakness of their scheme such as: the buyer with intention can remove the fingerprint in the watermarked content, because he/she can decrypt the encrypted fingerprint with a symmetric key using man-in-the-middle-attack; a real identity of a buyer can be revealed to the seller through the identification process even though he/she is honest. Furthermore, we propose an improved secure and efficient anonymous asymmetric fingerprinting scheme which enables to reduce the number of communication between the participants.
Keywords
Asymmetric Fingerprinting; Watermarking; Anonymity; Man-in-the-middle-attack;
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Times Cited By KSCI : 1  (Citation Analysis)
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