一种新的可授权的盲群签名方案

首先指出了严方案中存在的一个安全性问题，随后利用椭圆曲线密码算法设计了一个新的盲群签名方案，该方案同时具有盲签名和群签名的特点，并在方案中引入了一个签名权的授权过程：要求签名人必须同时利用私钥和授权证书才能进行签名，接收者可以验证签名的有效性，但是不能识别出签名者真实身份，当有争议发生时，群权威可以“打开”签名，确定出签名者的真实身份。相比较严方案，该方案计算量小，结构简单，有实用价值。

New authorized blind group signature scheme

This paper points out a insecurity problem,and constructs a new authorized blind group signature scheme with the characteristics of blind signature and group signature.In this scheme,signer can sign a signature only when he knows both a secret key of one group member and a secret certificate.The receiver can verify the validity of the signature but he can’t distinguish which signature signed it.When the dispute occurs,only the authority can“open”the group signature to distinguish where the signature comes from.This scheme has lower computation,higher safety,simpler structure and more applied value than Yan’s scheme.