分析指出现有辫子群上的不经意传输协议通过辫元的指数形式隐藏接收者的选择信息进而保证其隐私性,辫元指数形式的存在导致该协议计算效率较低。基于辫子群上同时共轭搜索问题和分解问题的难解性,提出了一个N取M不经意传输协议,当M=1时对应协议比现有协议的计算效率更高。
It is shown that the existing oblivious transfer protocols hided the choice of the receiver using exponential braids,which made the protocols have low efficiency.This paper proposed an M-out-of-N oblivious transfer protocol based on the difficulty of the simultaneous conjugacy search problem and the decomposition problem over the braid groups.When M=1 the proposed protocol is much more efficient in computation than existing protocol.