Cryptology ePrint Archive: Report 2017/944

A Unified Approach to Constructing Black-box UC Protocols in Trusted Setup Models

Susumu Kiyoshima and Huijia Lin and Muthuramakrishnan Venkitasubramaniam

Abstract: We present a unified framework for obtaining black-box constructions of Universal Composable (UC) protocol in trusted setup models. Our result is analogous to the unified framework of Lin, Pass, and Venkitasubramaniam [STOC'09, Asiacrypt'12] that, however, only yields non-black-box constructions of UC protocols. Our unified framework shows that to obtain black-box constructions of UC protocols, it suffices to implement a special purpose commitment scheme that is, in particular, concurrently extractable using a given trusted setup. Using our framework, we improve black-box constructions in the common reference string and tamper-proof hardware token models by weakening the underlying computational and setup assumptions.

Category / Keywords: secure computation, black-box constructions

Original Publication (in the same form): IACR-TCC-2017

Date: received 25 Sep 2017

Contact author: kiyoshima susumu at lab ntt co jp, rachel lin@cs ucsb edu, muthuv@cs rochester edu

Available format(s): PDF | BibTeX Citation

Version: 20170927:140517 (All versions of this report)

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