Cryptology ePrint Archive: Report 2004/027

Linkable Spontaneous Anonymous Group Signature for Ad Hoc Groups

Joseph K. Liu and Victor K. Wei and Duncan S. Wong

Abstract: 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.

Category / Keywords: Linkable, Signature

Publication Info: To appear ACISP 2004.

Date: received 2 Feb 2004, last revised 1 May 2004

Contact author: ksliu9 at ie cuhk edu hk

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Version: 20040501:133628 (All versions of this report)

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