Group Signatures with Verifier-Local Revocation and Backward Unlinkability in the Standard Model

  • Authors:
  • Benoît Libert;Damien Vergnaud

  • Affiliations:
  • Microelectronics Laboratory, Crypto Group, Université Catholique de Louvain, Louvain-la-Neuve, Belgium 1348;École normale supérieure --- C.N.R.S. --- I.N.R.I.A., Paris CEDEX 05, France 75230

  • Venue:
  • CANS '09 Proceedings of the 8th International Conference on Cryptology and Network Security
  • Year:
  • 2009

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Abstract

Group signatures allow users to anonymously sign messages in the name of a group. Membership revocation has always been a critical issue in such systems. In 2004, Boneh and Shacham formalized the concept of group signatures with verifier-local revocation where revocation messages are only sent to signature verifiers (as opposed to both signers and verifiers). This paper presents an efficient verifier-local revocation group signature (VLR-GS) providing backward unlinkability (i.e. previously issued signatures remain anonymous even after the signer's revocation) with a security proof in the standard model (i.e. without resorting to the random oracle heuristic).