2004 | OriginalPaper | Buchkapitel
Linkable Spontaneous Anonymous Group Signature for Ad Hoc Groups
verfasst von : Joseph K. Liu, Victor K. Wei, Duncan S. Wong
Erschienen in: Information Security and Privacy
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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We present a linkable spontaneously anonymous group (LSAG) signature scheme (alternatively known as linkable ring signature scheme) satisfying the following three properties. (1) Anonymity, or signer indistinguishability. (2) Linkability: That two signatures by the same signer can be linked. (3) Spontaneity: No group secret, therefore no group manager or group secret sharing setup. We reduce the security of our scheme to well-known problems under the random oracle model. Using the scheme, we construct a new efficient one-round e-voting system which does not have a registration phase. We also present a new efficient reduction of famous rewind simulation lemma which only relies on elementary probability theory. Threshold extensions of our scheme are also presented.