Analysis and Attack of Two Ring Signature Schemes

Abstract

A ring signature scheme enables a signer, in an ad-hoc manner, to sign a signature on behalf of a group of users including himself such that a verifier can be convinced that one of the identified users actually generated the signature but he can not identify the signer. In this paper, we analyse and attack two ring signature related schemes, including a ring signature scheme and a ring signcryption scheme, we prove that they can not satisfy the property of unconditional anonymity, and are all insecure.