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One-out-of-m spacetime-constrained oblivious transfer

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In one-out-of-m spacetime-constrained oblivious transfer (SCOT), Alice and Bob agree on m pairwise spacelike separated spacetime regions R_0,R_1,..., R_{m-1} in close-to-Minkowski spacetime; Alice inputs a message x_i in the causal past of a spacetime point Q_i of R_i, for i\in{0,1,...,m-1}; Bob inputs b\in{0,1,...,m-1} in the intersection of the causal pasts of Q_0,Q_1,...,Q_{m-1} and outputs x_b in R_b; Alice remains oblivious to b anywhere in spacetime; and Bob cannot obtain x_i in R_i and x_j in R_j for any pair of different numbers i,j\in{0,1,...,m-1}. We introduce unconditionally secure one-out-of-m SCOT protocols extending previous one-out-of-two SCOT protocols, for arbitrary m >= 2.

This talk is part of the CQIF Seminar series.

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