报 告 人: 穆怡 教授(“闽江学者奖励计划”讲座教授)
澳大利亚卧龙岗大学(University of Wollongong, Australia)
报告题目:Membership Encryption
时 间:2013年10月23日(星期三)下午15:30
地 点:仓山校区成功楼603教室
主 办:数学与计算机科学学院,福建省网络安全与密码技术重点实验室
参加对象:数计学院部分教师和研究生
报告摘要: In this talk, a new encryption primitive, Membership Encryption will be presented. Let P(G) be a privacy-preserving token on a group attribute/identity G, such that given P(G) it is hard to know the attributes in G. In this membership encryption, if an encryption takes as input an attribute A and the token P(G), the decryption requires holding the membership A in G, i.e., A belongs to this group attribute. Membership encryption is applicable in constructing membership proof A in P(G) with privacy preserving on group attribute and the membership. Membership encryption can be also utilized to construct an efficient two-round K-out-of-N oblivious transfer protocol. We construct a provably secure membership encryption where the group token P(G) is constant-size with maximum number accountability on attributes. Using our scheme, the proposed oblivious transfer protocol exhibits the nice feature of O(1) communication cost for any K from receiver to sender, and O(N) communication cost from sender to receiver.
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