Bit Commitment Using Pseudo-Randomness
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
Proving Ownership of Digital Content
IH '99 Proceedings of the Third International Workshop on Information Hiding
Zero-Knowledge Watermark Detection and Proof of Ownership
IHW '01 Proceedings of the 4th International Workshop on Information Hiding
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
Convertible Undeniable Signature Scheme
HPC-ASIA '97 Proceedings of the High-Performance Computing on the Information Superhighway, HPC-Asia '97
The large scale electronic voting scheme based on undeniable multi-signature scheme
ICCSA'05 Proceedings of the 2005 international conference on Computational Science and Its Applications - Volume Part II
The large scale electronic voting scheme based on undeniable multi-signature scheme
ICCSA'05 Proceedings of the 2005 international conference on Computational Science and Its Applications - Volume Part II
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In undeniable signature scheme, the digital signature can be verified and disavowed only with cooperation of the signer. Digital watermarks have been proposed as the means for copyright protection of multimedia data. Some one can provide counterfeited watermark which can be performed on a watermarked multimedia contents to allow multiple claims of rightful ownerships. The confirmer of a watermark wants to make sure that only the intended verifier can be convinced about the validity of the watermark. Undeniable signature scheme is suited to this application since the signature cannot be verified without cooperation of the signer. Existing copyright protection schemes are mainly focused on protection of single owner's copyright. In case that digital multimedia contents is made by co-workers, a joint copyright protection scheme is needed to provide equal right to them. In this study, we propose the undeniable multi-signature scheme. The multi-signature can be verified and disavowed only in cooperation with all signers. The proposed scheme satisfies the undeniable property and it is secure against active attacks such as modification and denial of the multi-signature by signers. We also discuss how to make joint copyright on digital contents and fair on-line sales of this copyrighted contents.