Oblivious transfer with timed-release receiver's privacy

Authors:
Xu Ma;Lingling Xu;Fangguo Zhang
Affiliations:
School of Information Science and Technology, Sun Yat-Sen University, Guangzhou 510275, China and Guangdong Key Laboratory of Information Security Technology, Guangzhou 510275, China;School of Information Science and Technology, Sun Yat-Sen University, Guangzhou 510275, China and Guangdong Key Laboratory of Information Security Technology, Guangzhou 510275, China;School of Information Science and Technology, Sun Yat-Sen University, Guangzhou 510275, China and Guangdong Key Laboratory of Information Security Technology, Guangzhou 510275, China
Venue:
Journal of Systems and Software
Year:
2011

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Abstract

Abstract: Oblivious transfer (OT) is an important primitive used in many cryptographic protocols. According to the traditional OT's security requirements, the privacy of the receiver is protected forever, which, however, limits the applications of OT in some areas. In this paper, we propose a new OT with timed-release receiver's privacy in which the sender has N messages, of which the receiver can choose to receive one or more, in such a way that (a) the receiver only learns about the requested messages, and (b) the sender learns the receiver's selections after a designated time. Thus the receiver's privacy is just protected within a period of time. Besides, we also present a concrete scheme combining Tzeng's OT scheme with Casassa Mont et al.'s timed-release encryption scheme.