Conditional Converge Cast

Daisuke INOUE  Keisuke TANAKA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A   No.6   pp.1537-1540
Publication Date: 2008/06/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.6.1537
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Cryptography and Information Security
oblivious transfer,  oblivious cast,  converge cast,  

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In this paper, we introduce a new notion of conditional converge cast (CCC), by adding the conditional property to converge cast. A CCC protocol with predicate Q is a three-party protocol which involves two senders S0 and S1 and a receiver R. S0 owns a secret x and a message m0, so does S1 with y and m1. In a protocol, S0 and S1 send their messages to R in a masked form. R obtains the message depending on the value of Q(x,y), i.e. R obtains m0 if Q(x,y)=0, or m1 otherwise. The secrets, x and y, are not revealed to R or the other sender, and Q(x,y) is not revealed to S0 and S1. In addition to the formulation, we propose a concrete scheme for conditional converge cast with the "equality" predicate.