权重型n选1不经意传输协议  

Weighted 1-out-of-n Oblivious Transfer Protocol

作　　者：张辰旭 张艳硕[1] 张黎仙 ZHANG Chenxu;ZHANG Yanshuo;ZHANG Lixian(Beijing Electronic Science and Technology Institute,Beijing 100070,P.R.China)

机构地区：[1]北京电子科技学院,北京市100070

出　　处：《北京电子科技学院学报》2022年第4期24-39,共16页Journal of Beijing Electronic Science And Technology Institute

基　　金：2020年教育部新工科项目“新工科背景下数学课程群的教学改革与实践”;“信息安全”国家级一流本科专业建设点;国家重点研发计划基金资助项目(项目编号:2017YFB0801803)

摘　　要：不经意传输协议(Oblivious Transfer Protocol,简称OT协议)是一种可保护双方隐私的通信协议,能使通信双方通过选择模糊化的方式传送消息。在现在越来越复杂的网络环境中,用户的实际应用需求越来越多样化,一般的n选1不经意传输协议已经很难满足我们多样化的需求。因此,在本文中我们基于Diffie-Hellman假设提出了权重型n选1不经意传输协议,该协议可以根据接收者的实际需求设置相应的权重来获取秘密消息,离散对数和随机预言机保证了该协议的安全性。同时这种形式的通信代价并不会因此而提高,相反还会优于一般的n选1不经意传输协议,因此它能够在保证自身通信代价的同时,满足我们在复杂网络环境中的多样化需求。最后,我们还进行了权重型n选1不经意传输方案的编程实现和相关测试,证明了权重型n选1不经意传输在未来应用方面的可能性。Oblivious transfer protocol is a communication protocol capable of protecting the privacy of both parties by transmitting messages in an obfuscation pattern.In current increasingly complex network environment,growingly diversified users’application requirement leads to that the general 1-out-of-n oblivious transfer protocol is unable to satisfy the demand for the diversity.Thus,a weighted 1-out-of-n oblivious transfer protocol based on the Diffie-Hellman assumption is proposed in this paper,where relevant weight is set according to the receiver’s actual demand to obtain the secret message.The discrete logarithm and the random prediction machine ensure the security of the proposed protocol.Communication overhead of the proposed protocol is not increased due to the form,which is superior than that of the general 1-out-of-n oblivious transfer protocol.With the proposed protocol,demand for the diversity in complex network environment could be satisfied,while the communication overhead is ensured.Finally,programmatic implementation and related test of the proposed protocol are also performed.Experiment results exhibit the potential of the proposed protocol for future applications.

关 键 词：不经意传输 权重型 n选1 方案 

分 类 号：TN918[电子电信—通信与信息系统]