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SUMMARY:One-out-of-m spacetime-constrained oblivious transfer - Damian Pit
 alua-Garcia (CQIF\, DAMTP\, University of Cambridge)
DTSTART:20200214T151500Z
DTEND:20200214T154500Z
UID:TALK139753@talks.cam.ac.uk
CONTACT:Adrian Kent
DESCRIPTION:In one-out-of-m spacetime-constrained oblivious transfer (SCOT
 )\, Alice\nand Bob agree on m pairwise spacelike separated spacetime regio
 ns\nR_0\,R_1\,...\, R_{m-1} in close-to-Minkowski spacetime\; Alice inputs
  a\nmessage x_i in the causal past of a spacetime point Q_i of R_i\, for\n
 i\\in{0\,1\,...\,m-1}\; Bob inputs b\\in{0\,1\,...\,m-1} in the intersecti
 on of\nthe causal pasts of Q_0\,Q_1\,...\,Q_{m-1} and outputs x_b in R_b\;
  Alice\nremains oblivious to b anywhere in spacetime\; and Bob cannot obta
 in x_i\nin R_i and x_j in R_j for any pair of different numbers\ni\,j\\in{
 0\,1\,...\,m-1}. We introduce unconditionally secure one-out-of-m\nSCOT pr
 otocols extending previous one-out-of-two SCOT protocols\, for\narbitrary 
 m >= 2.
LOCATION:MR21\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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