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中文摘要：
不经意传输协议是设计其他密码协议的基础，同样，该协议在电子商务中也有很多应用．本文首先以2取1不经意传输协议作为子协议，构造n取1不经意传输协议，再以n取1不经意传输协议为子协议构造n取m不经意传输协议．最后，我们利用在公钥密码系统中，由公钥推导出私钥难这一性质，构造出2取1不经意传输协议，从而得出推论，任意的公钥密码系统都可以用来构造n取m不经意传输协议．
英文摘要：
Oblivious transfer （OT）is used as a key component in many applications of cryptography. In this paper, a 1-out-of-n oblivious transfer is constructed based on the sub protocol 1-out-of-2 oblivious transfer; an m-out-of-n oblivious transfer is constructed based on the sub protocol 1-out-of-n oblivious transfer. Finally, a1-out-of-2 oblivious transfer is constructed based on public key system. By this way, any existed public key system can be used to construct m-out-of-n oblivious transfer.
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