Verifier-Local Revocation Group Signature Schemes with Backward Unlinkability from Bilinear Maps*The preliminary version of this paper was presented at ASIACRYPT 2005 [17].

Authors:
Toru Nakanishi;Nobuo Funabiki
Affiliations:
The authors are with the Department of Communication Network Engineering, Okayama University, Okayama-shi, 700-8530 Japan. E-mail: nakanisi@cne.okayama-u.ac.jp, E-mail: funabiki@cne.okayama-u.ac.j ...;The authors are with the Department of Communication Network Engineering, Okayama University, Okayama-shi, 700-8530 Japan. E-mail: nakanisi@cne.okayama-u.ac.jp, E-mail: funabiki@cne.okayama-u.ac.j ...
Venue:
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Year:
2007

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Abstract

An approach of membership revocation in group signatures is verifier-local revocation (VLR for short). In this approach, only verifiers are involved in the revocation mechanism, while signers have no involvement. Thus, since signers have no load, this approach is suitable for mobile environments. Although Boneh and Shacham recently proposed a VLR group signature scheme from bilinear maps, this scheme does not satisfy the backward unlikability. The backward unlinkability means that even after a member is revoked, signatures produced by the member before the revocation remain anonymous. In this paper, we propose VLR group signature schemes with the backward unlinkability from bilinear maps.