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Title:
Efficient and Universally Composable Committed Oblivious Transfer and Applications
Authors: Juan Garay, Philip MacKenzie, Ke Yang
Abstract:Committed Oblivious Transfer (COT) is a useful cryptographic primitive
that combines the functionalities of bit commitment and oblivious
transfer. In this paper, we introduce an extended version of COT
(ECOT) which additionally allows proofs of relations among committed
bits, and we construct an efficient protocol that securely realizes an
ECOT functionality in the universal-composability (UC) framework in
the common reference string (CRS) model. Our construction is more
efficient than previous (non-UC) constructions of COT, involving only
a constant number of exponentiations and communication rounds. Using the ECOT functionality as a building block, we construct efficient UC protocols for general two-party and multi-party functionalities (in the CRS model), each gate requiring a constant number of ECOT’s.
ePrint: https://eprint.iacr.org/2004/053
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