指定验证者签名方案的安全性分析

Cryptanalysis of Designated Verifier Signature Schemes

对Kang等人和张学军提出的2个基于身份的指定验证者签名方案(Kang方案和Zhang方案)进行安全性分析,指出在Kang方案中,非指定验证者也可以验证签名的有效性,不能抵抗伪造攻击和授权攻击,Zhang方案也不满足不可伪造性、强壮性和不可授权性。

This paper cryptanalyzes an ID-based designated verifier signature schemes proposed by Kang, et al, and Zhang Xuejun（Zhang scheme and Kang scheme）, and shows that the scheme does not satisfy the security property that only the designated verifier can check the validity of signatures. It points out the scheme is insecure against forgeability attack and delegatability attack. It finds out the scheme does not satisfy the securities of unforgeability, strongness and non-delegatability.