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Cryptanalysis of Two Anonymous Buyer-Seller Watermarking Protocols and An Improvement for True Anonymity
| Venue: | Proceedings of ACNS ’04, LNCS 3089 |
| Citations: | 5 - 1 self |
BibTeX
@INPROCEEDINGS{Phan_cryptanalysisof,
author = {Raphael C. −w. Phan and Yanjiang Yang and Feng Bao and Robert H. Deng and M. U. Siddiqi},
title = {Cryptanalysis of Two Anonymous Buyer-Seller Watermarking Protocols and An Improvement for True Anonymity},
booktitle = {Proceedings of ACNS ’04, LNCS 3089},
year = {},
pages = {369--382}
}
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Abstract
Abstract. By combining techniques of watermarking and fingerprinting, a sound buyer-seller watermarking protocol can address the issue of copyright protection in e-commerce. In this paper, we analyze the security of two recent anonymous buyer-seller watermarking protocols proposed by Ju et. al and Choi et. al respectively, and prove that they do not provide the features and security as claimed. In particular, we show that i) the commutative cryptosystem used in Choi et. al’s protocol fails to prevent the watermark certification authority (WCA) from discovering the watermark (fingerprint) chosen by the buyer; ii) for both protocols, the seller can discover the watermark chosen by the buyer if he colludes with the WCA. Hence, these protocols cannot guard against conspiracy attacks. We further show that these protocols only provide “partial” anonymity, ie. the buyer’s anonymity is guaranteed only if WCA is honest. Our results suggest that the security of these protocols must assume the honesty of WCA, contrary to the designers ’ original claim. Finally, we propose a new anonymous buyer-seller watermarking protocol which is more secure and efficient, and provides true anonymity.
Keyphrases
true anonymity anonymous buyer-seller watermarking protocol conspiracy attack recent anonymous buyer-seller watermarking protocol new anonymous buyer-seller watermarking protocol partial anonymity watermark certification authority commutative cryptosystem buyer anonymity sound buyer-seller designer original claim copyright protection
