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Concurrent oblivious transfer

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2 Author(s)
Garay, J.A. ; Lucent Technol. Bell Labs., Murray Hill, NJ, USA ; MacKenzie, P.

We consider the problem of designing an efficient oblivious transfer (OT) protocol that is provably secure in a concurrent setting, i.e., where many OT sessions may be running concurrently with their messages interleaved arbitrarily. Known OT protocols use zero-knowledge proofs, and no concurrent zero-knowledge proofs are known that use less than a poly-logarithmic number of rounds (at least without requiring a pre-processing phase, a public random string, an auxiliary string, timing constraints, or pre-distributed public keys). We introduce a model for proving security of concurrent OT protocols, and present a protocol that is proven secure in this model based on the decisional Diffie-Hellman problem. The protocol is efficient, requiring only a slightly non-constant number of rounds

Published in:

Foundations of Computer Science, 2000. Proceedings. 41st Annual Symposium on

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