一种通用的指定验证者环签名方案的改进

摘要

Li-Wang(2006)提出了一种通用指定验证者环签名方案(UDVRS).该方案允许签名者指定一个验证者并产生一个指定验证者环签名,使得只有指定验证者才能验证该环签名.通过对Li-Wang提出的通用环签名方案进行分析,指出了该方案并不满足指定验证者性质,给出了攻击方法.为避免该缺陷,对Li-Wang通用指定验证者环签名方案进行改进,改进后的方案是可证安全的.%The general notion of universal designated verifier ring signature (UDVRS) is introduced in 2006 by Li and Wang.The scheme allows signer to designate a designated verifier and generate a designated verifier ring signature, so that only designated verifier can verify the ring signature.The security of the ring signature schemes is analyzed, and it is found that the scheme not satisfy the prop-erty of designated verifier.To guard against the flaw, Li-Wang(2006) universal designated verifier ring signature scheme is improved, and the improved scheme is provably secure.