Cryptology ePrint Archive: Report 2004/179
Identity Based Threshold Ring Signature
Sherman S.M. Chow and Lucas C.K. Hui and S.M. Yiu
Abstract: In threshold ring signature schemes, any group of $t$ entities spontaneously conscripting arbitrarily $n-t$ entities to generate a publicly verifiable $t$-out-of-$n$ signature on behalf of the whole group, yet the actual signers remain anonymous. The spontaneity of these schemes is desirable for ad-hoc groups such as mobile ad-hoc networks. In this paper, we present an identity based (ID-based) threshold ring signature scheme. The scheme is provably secure in the
random oracle model and provides trusted authority compatibility. To the best of authors' knowledge, our scheme is the first ID-based threshold ring signature scheme which is also the most efficient (in terms of number of pairing operations required) ID-based ring signature scheme (when $t = 1$) and threshold ring signature scheme from pairings.
Category / Keywords: public-key cryptography / Threshold ring signature, identity-based signature, bilinear pairings, anonymity, spontaneity
Publication Info: ICISC 2004, To Appear
Date: received 24 Jul 2004, last revised 2 Feb 2005
Contact author: smchow at cs hku hk
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Note: An appendix about related concurrent work is added.
Version: 20050202:102701 (All versions of this report)
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