Cryptanalysis of Proxy Multi signature, Multi proxy Signature and Multi proxy Multi signature Schemes from Bilinear Pairings
对来自双线性配对的三种代理签名体制的密码学分析*

Ji proposed three new types of proxy signature schemes that deal with multiple signers from bilinear pairings.The first type is called a proxy multi-signature scheme,the second type is called a multi-proxy signature scheme,and the third type is called multi-proxy multi-signature scheme.But the three proxy signatures are all insecure.Forgery attacks are presented on the proxy signatures.Using the forgery attacks,anyone of original signers or proxy signers can produce a valid proxy signature.