## Cryptology ePrint Archive: Report 2004/267

Patrick P. Tsang and Victor K. Wei and Tony K. Chan and Man Ho Au and Joseph K. Liu and Duncan S. Wong

Abstract: A ring signature scheme is a group signature scheme with no group manager to setup a group or revoke a signer. A linkable ring signature, introduced by Liu, et al. \cite{LWW04}, additionally allows anyone to determine if two ring signatures are signed by the same group member (a.k.a. they are \emph{linked}). In this paper, we present the first separable linkable ring signature scheme, which also supports an efficient thresholding option. We also present the security model and reduce the security of our scheme to well-known hardness assumptions. In particular, we introduce the security notions of {\em accusatory linkability} and {\em non-slanderability} to linkable ring signatures. Our scheme supports event-oriented'' linking. Applications to such linking criterion is discussed.

Category / Keywords: public-key cryptography / ring signatures, linkability, separability

Publication Info: An extended abstract of this paper was in Indocrypt'04.

Date: received 15 Oct 2004, last revised 18 Nov 2004

Contact author: pktsang3 at ie cuhk edu hk

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