International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Round-Optimal Black-Box Secure Computation from Two-Round Malicious OT

Yuval Ishai , Technion
Dakshita Khurana , UIUC
Amit Sahai , UCLA
Akshayaram Srinivasan , Tata Institute of Fundamental Research, India
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Presentation: Slides
Conference: TCC 2022
Abstract: We give round-optimal {\em black-box} constructions of two-party and multiparty protocols in the common random/reference string (CRS) model, with security against malicious adversaries, based on any two-round oblivious transfer (OT) protocol in the same model. Specifically, we obtain two types of results. \smallskip \begin{enumerate} \item {\bf Two-party protocol.} We give a (two-round) {\it two-sided NISC} protocol that makes black-box use of two-round (malicious-secure) OT in the CRS model. In contrast to the standard setting of non-interactive secure computation (NISC), two-sided NISC allows communication from both parties in each round and delivers the output to both parties at the end of the protocol. Prior black-box constructions of two-sided NISC relied on idealized setup assumptions such as OT correlations, or were proven secure in the random oracle model. \item {\bf Multiparty protocol.} We give a three-round secure multiparty computation protocol for an arbitrary number of parties making black-box use of a two-round OT in the CRS model. The round optimality of this construction follows from a black-box impossibility proof of Applebaum et al. (ITCS 2020). Prior constructions either required the use of random oracles, or were based on two-round malicious-secure OT protocols that satisfied additional security properties. \end{enumerate}
  title={Round-Optimal Black-Box Secure Computation from Two-Round Malicious OT},
  author={Yuval Ishai and Dakshita Khurana and Amit Sahai and Akshayaram Srinivasan},