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. 30th April, 2004.
In 2004, Liu et al. REF constructed the first LRS scheme and proved it to be secure under the random oracle model, they then proposed a one-round e-voting system based on it.
Linkable Spontaneous Anonymous Group Signature for Ad Hoc Groups
In ACISP’04, volume 3108 of LNCS
Computer Science