Abstract: Based on ECC，a new oblivious transfer protocol with access control has been proposed in this paper.The proposed protocol has the property of oblivious transfer.Futhermore，the only receiver who has issued by the trust centre authority can open the message which they chose and the sender can not decide whether the receiver has been authenticated or not by the trust centre.The identity of the receiver can not be confirmed by the sender.Under the ECDLP assumption，the proposed scheme has provable security.This protocol has less data，faster and more applied value than others which are based on FFDLP.

Key words: access control, oblivious transfer, elliptic curve

摘要： 利用椭圆曲线密码算法构造了一个带有接入控制的不经意传输协议，除了具有一般不经意传输协议的特征外，还要求只有经过授权的接收者才能解密他想要得到的消息，而且发送者不能确定该接收者是否被授权，即不能确定接收者的真实身份，保证了接收者的隐私。随后，基于椭圆曲线离散对数问题（ECDLP）难解性的假设证明了该方案的安全性。比较现有的基于有限域上离散对数问题的不经意传输协议，该方案具有数据量更小，速度更快，适用性更广等特点，具有一定的参考价值。

关键词: 接入控制, 不经意传输, 椭圆曲线