基于数字签名的增强的不经意传输协议
Signature-Based Enhanced Oblivious Transfer
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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。Abstract: Based 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.
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Rabin M. How to exchange secrets by oblivious transferTechnical Report TR-81, Aiken Computation Laboratory, Harvard Univ., 1981.[2]Li Ninghui, Du Wenliang, Boneh Dan. Oblivious signature-based envelope. In Proceedings of the 22nd ACM Symposium on Principles of Distributed Computing (PODC 2003), Boston, Massachusetts, July 2003, New York, ACM Press, 2003: 182-189.[3]Tzeng W G. Efficient 1-out-of-n oblivious transfer schemes with universally usable parameters[J].. IEEE Trans. on Computers.2004, 53(2):232-240[4]Schnorr C.Efficient identification and signature for smart cards.In:Advances in Cryptology-Crypto'89,volume 435 of Lecture Notes in Computer Science,Berlin,Springer-Verlag,1990:235-251.[5]ElGamal T.A public-key cryptosystem and a signature scheme based on discrete logarithms[J].IEEE Trans.on Information Theory.1985,31(4):469-472 -
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