科研之友
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摘要
In 1-out-of-2 oblivious transfer (OT), Alice inputs numbers x(0), x(1), Bob inputs a bit b and outputs x(b). Secure OT requires that Alice and Bob learn nothing about b and x(b), respectively. We define spacetime-constrained oblivious transfer (SCOT) as OT in Minkowski spacetime in which Bob must output x(b) within R-b, where R-0 and R-1 are fixed spacelike separated spacetime regions. We show that unconditionally secure SCOT is impossible with classical protocols inMinkowski (or Galilean) spacetime, or with quantum protocols in Galilean spacetime. We describe a quantum SCOT protocol in Minkowski spacetime, and we show it unconditionally secure.
- 出版日期2016-6-29
