概率型2选1不经意传输协议的方案设计

On Scheme Design of Probabilistic 1 out of 2 Oblivious Transfer Protocol

目前的2选1不经意传输协议可以分为两类:一类是接收方有50%的概率可以获取自己想得到的消息,另一类是接收方有100%的概率可以获取自己想得到的消息.考虑到复杂网络情形,以固定概率获取所需信息的接收方受到限制.本文分别在Even、Bellare和Naor的2选1不经意传输协议的基础上,对接收方成功恢复所需的秘密信息的概率进行了一般化处理,使得接收方可以以一般的概率来成功恢复自己想得到的秘密信息,并分析了协议的安全性及正确性.由于概率可以根据需求进行设置,因此可以在应用方面更加灵活.

At present,1-out-of-2 oblivious transfer protocols can be divided into two categories:one is that the receiver has a 50% probability of getting the message he wants,another is that the receiver has a 100% probability to get the message he wants.Considering complex networks,the receiver who can only obtain the required information with a fixed probability will be limited.In this paper,on the basis of Even,Bellare and Naor’s 1-out-of-2 oblivious transfer,we generalize the probability of the receiver’s successful recovery of the secret information needed,so that the receiver can recover the secret information he wants with a general probability.The security and correctness of the protocols are analyzed.Because the probability of the protocols can be set according to the needs,the protocols have more flexible applications.