Cryptology ePrint Archive: Report 2017/344

DUPLO: Unifying Cut-and-Choose for Garbled Circuits

Vladimir Kolesnikov and Jesper Buus Nielsen and Mike Rosulek and Ni Trieu and Roberto Trifiletti

Abstract: Cut-and-choose (C&C) is the standard approach to making Yao’s garbled circuit two-party computation (2PC) protocol secure against malicious adversaries. Traditional cut-and-choose operates at the level of entire circuits, whereas the LEGO paradigm (Nielsen & Orlandi, TCC 2009) achieves asymptotic improvements by per- forming cut-and-choose at the level of individual gates. In this work we propose a unified approach called DUPLO that spans the entire continuum between these two extremes. The cut-and-choose step in our protocol operates on the level of arbitrary circuit “components,” which can range in size from a single gate to the entire circuit itself. With this entire continuum of parameter values at our disposal, we find that the best way to scale 2PC to computations of realistic size is to use C&C components of in- termediate size, and not at the extremes. On computations requiring several millions of gates or more, our more general approach to C&C gives between 4-7x improvement over existing approaches. In addition to our technical contributions of modifying and optimizing previous proto- col techniques to work with general C&C components, we also provide an extension of the recent Frigate circuit compiler (Mood et al, EuroS&P 2016) to effectively express any C-style program in terms of components which can be processed efficiently using our protocol.

Category / Keywords: cryptographic protocols / 2PC, LEGO, Implementation, UC-secure

Date: received 18 Apr 2017, last revised 23 May 2017

Contact author: roberto at cs au dk

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Version: 20170523:075814 (All versions of this report)

Short URL: ia.cr/2017/344

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