三种盲代理多重签名方案的密码分析

Cryptanalysis of Three Blind Proxy Multi-signature Schemes

对三种盲代理多重签名方案进行了密码分析,在李媛等人(2003)的方案中,任何一个原始签名者可以通过伪造代理密钥的方法产生盲代理多重签名;在康莉等人(2007)的第1类盲代理多重签名方案中,攻击者不仅可以伪造任何代理签名者的有效子代理密钥,而且还可以伪造对任何消息的盲代理多重签名:在康莉等人的第2类盲代理多重签名方案中,攻击者可以通过伪造代理密钥的方法产生有效盲代理多重签名,从而证明了这3种方案都是不安全的。

Through the cryptanalysis of three blind proxy multi-signature schemes, it shows that in Li Yuan et al.＇s scheme, any original signer can sign a valid blind proxy multi-signature by the means of forging proxy key, and in Kang Li et al.＇s first type blind proxy multi-signature scheme, attacker not only can forge any proxy signer＇s proxy sub-key, but also can forge blind proxy multi-signatures on any message, and in Kang Li et al.＇s second type blind proxy multi-signature scheme, attacker can sign a valid blind proxy multi-signature by the means of forging proxy key, therefore the three schemes are not secure.