Welcome to the resource topic for 2020/216
Title:
Black-Box Constructions of Bounded-Concurrent Secure Computation
Authors: Sanjam Garg, Xiao Liang, Omkant Pandey, Ivan Visconti
Abstract:We construct a general purpose secure multiparty computation protocol which remains secure under (a-priori) bounded-concurrent composition and makes only black-box use of cryptographic primitives. Prior to our work, constructions of such protocols required non-black-box usage of cryptographic primitives; alternatively, black-box constructions could only be achieved for super-polynomial simulation based notions of security which offer incomparable security guarantees. Our protocol has a constant number of rounds and relies on standard polynomial-hardness assumptions, namely, the existence of semi-honest oblivious transfers and collision-resistant hash functions. Previously, such protocols were not known even under sub-exponential assumptions.
ePrint: https://eprint.iacr.org/2020/216
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