NEW EFFICIENT TIMED COMMITMENT SCHEMES

Wang Tao, Yi Xian Yang () and Xin Xin Niu
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Wang Tao: P.O. Box 126, Information Security Center, Beijing University of Posts & Telecommunications, Beijing 100876, China
Yi Xian Yang: P.O. Box 126, Information Security Center, Beijing University of Posts & Telecommunications, Beijing 100876, China
Xin Xin Niu: P.O. Box 126, Information Security Center, Beijing University of Posts & Telecommunications, Beijing 100876, China

International Journal of Information Technology & Decision Making (IJITDM), 2003, vol. 02, issue 02, 287-297

Abstract: A timed commitment is an extension to the standard commitment scheme in which there is a forced-open phase for the verifier to open the committed value even without the help of the committer. The first notion of timed commitment was from Boneh and Naor,2based on the hardness of the best-known algorithm for computingg(2n)modN. We use a different approach to design two new schemes. These two schemes are based upon ElGamal encryption and Pubic Verifiable Secret Sharing (PVSS) respectively. Unlike the original scheme, our schemes can be timed precisely, thus easy to be applied in some short-term schemes. We also discuss the implementation of our schemes in contract-signing schemes.

Keywords: Timed commitment; contract signing; public-key cryptography (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1142/S0219622003000616

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