Shorter verifier-local revocation group signature with backward unlinkability

Authors:
Lingbo Wei;Jianwei Liu
Affiliations:
School of Electronics and Information Engineering, Beihang University, China and State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, China;School of Electronics and Information Engineering, Beihang University, China
Venue:
Pairing'10 Proceedings of the 4th international conference on Pairing-based cryptography
Year:
2010

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Abstract

Used as the privacy-preserving attestation by Trusted Computing effort (TCG) or the privacy-preserving authentication protocol in vehicular ad hoc networks (VANETs), group signature becomes more important than ever. Membership revocation is a delicate issue in group signatures. Verifier-local revocation (VLR) is a reasonable resolution, especially for mobile environments. Back unlinkability (BU) is a currently introduced security property providing further privacy. Based on the Decision Linear (DLIN) assumption and the q-Strong Diffie-Hellman (q- SDH) assumption, a new BU-VLR group signature scheme is proposed, which has the shortest signature size and smallest computation overhead among the previous BU-VLR group signature schemes.