International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Identity Based Threshold Ring Signature

Sherman S.M. Chow
Lucas C.K. Hui
S.M. Yiu
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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.
  title={Identity Based Threshold Ring Signature},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography / Threshold ring signature, identity-based signature, bilinear pairings, anonymity, spontaneity},
  note={ICISC 2004, To Appear 12816 received 24 Jul 2004, last revised 2 Feb 2005},
  author={Sherman S.M. Chow and Lucas C.K. Hui and S.M. Yiu},