【摘要】 该文在离散对数类数字签名及关于数据串的不经意传输的基础上提出了一种增强的不经意传输协议,解决了一种不经意传输的接入控制问题。除了具备一般不经意传输协议的特征外,该方案具有如下特点:只有持有权威机构发放的签字的接收者才能打开密文而且发送者不能确定接收者是否持有签字,即不能确定接受者的身份。在DDH(Decisional Diffie-Hellman)假设和随机预言模型下该文所提协议具有可证明的安全性。更多还原

【Abstract】 ased on Schnorr (Elgamal) signature and (string) oblivious transfer, an enhanced oblivious transfer protocol is proposed which solved the access control problem for an oblivious transfer protocol. The protocol proposed has the property: the only receiver who has the signature issued by the central authority can open the message which he chose; the sender can not decide whether the receiver has the signature or not. That is the identity of the receiver can not be confirmed after the protocol. Under the Decisional Diffie-Hellman(DDH) assumption the proposed scheme has provable security.更多还原