Black-Box Constructions of Bounded-Concurrent Secure Computation

Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 12238)


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.


Multi-party computation Bounded concurrent composition Black-box construction Straight-line extraction 


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Authors and Affiliations

  1. 1.University of CaliforniaBerkeleyUSA
  2. 2.Stony Brook UniversityStony BrookUSA
  3. 3.University of SalernoFiscianoItaly

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