International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Distributed Ring Signatures for Identity-Based Scenarios

Javier Herranz
Germ\'an S\'aez
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Abstract: In a ring signature scheme, a signer in a subset (or {\it ring}) of potential signers produces a signature of a message in such a way that the receiver can verify that the signature comes from a member of the ring, but cannot know which member has actually signed. In this work, we extend this concept to that of distributed ring signatures, where a subset of users cooperate to compute a distributed anonymous signature on a message, on behalf of a family of subsets. We propose two schemes, one for general families of subsets, and a more efficient one for threshold families of subsets. The security of both proposals is formally proved, assuming the hardness of the Computational Diffie-Hellman problem. Our two schemes run in an identity-based scenario, where public keys of the users can be derived from their identities. This fact avoids the necessity of digital certificates, and therefore allows more efficient implementations of such systems.
  title={Distributed Ring Signatures for Identity-Based Scenarios},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols / Identity-based cryptography, Ring signatures, Provable},
  note={ 12626 received 27 Jul 2004},
  author={Javier Herranz and Germ\'an S\'aez},