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Verifier-local revocation group signature schemes with backward unlinkability from bilinear maps. (English) Zbl 1154.94469

Roy, Bimal (ed.), Advances in cryptology – ASIACRYPT 2005. 11th international conference on the theory and application of cryptology and information security, Chennai, India, December 4–8, 2005, Proceedings. Berlin: Springer (ISBN 978-3-540-30684-9/pbk). Lecture Notes in Computer Science 3788, 533-548 (2005).
Summary: 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 unlikability 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.
For the entire collection see [Zbl 1131.94005].

MSC:

94A62 Authentication, digital signatures and secret sharing
94A60 Cryptography
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