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A Short Verifier-Local Revocation Group Signature Scheme with Backward Unlinkability

  • Toru Nakanishi
  • Nobuo Funabiki
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4266)

Abstract

Previously Verifier-Local Revocation (VLR) group signature schemes from bilinear maps were proposed. In VLR schemes, only verifiers are involved in the revocation of a member, while signers are not involved in the revocation. Thus, the schemes are suitable for mobile environments. Furthermore, the previously proposed schemes satisfy an important property, the backward unlinkability. It means that even after a member is revoked, signatures produced by the member before the revocation remain anonymous. This property is needed in case a member leaves voluntarily or in case of a stolen key. In this paper an improved scheme is proposed, where the group signatures are shorter. This is achieved using a different assumption, DLDH assumption, and improving zero-knowledge proofs in the group signatures. The length of the proposed group signatures is about 53% of that of the previous ones.

Keywords

group signature revocation backward unlinkability bilinear maps DLDH assumption 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Toru Nakanishi
    • 1
  • Nobuo Funabiki
    • 1
  1. 1.Dept. of Communication Network EngineeringOkayama UniversityJapan

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