A New Approach to Garbled Circuits

Anasuya Acharya, Tomer Ashur, Efrat Cohen, Carmit Hazay, Avishay Yanai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A garbling scheme is a fundamental cryptographic building block with a long list of applications. The study of different techniques for garbling a function, towards optimizing computation and communication complexity, has been an area of active research. Most common garbling techniques work by representing each gate in the circuit as a set of ciphertexts that encrypt its truth table row-by-row. In this work we present a new garbling scheme in the random oracle (RO) model that garbles circuits in the gate-by-gate paradigm by capturing the gate functionality (AND, XOR ) as a whole rather than as a set of ciphertexts. The final gate garbling requires 4 κ bits of communication in expectation, 4 RO calls for garbling and 1 RO call for evaluation. We prove that the scheme satisfies privacy in the non-programmable random oracle model and against PPT adversaries. We also show how this scheme can be extended to support free-XOR and garble any gate functionality over binary inputs.

Original languageEnglish
Title of host publicationApplied Cryptography and Network Security - 21st International Conference, ACNS 2023, Proceedings
EditorsMehdi Tibouchi, XiaoFeng Wang
PublisherSpringer Science and Business Media Deutschland GmbH
Pages611-641
Number of pages31
ISBN (Print)9783031334900
DOIs
StatePublished - 2023
Event21st International Conference on Applied Cryptography and Network Security, ACNS 2023 - Kyoto, Japan
Duration: 19 Jun 202322 Jun 2023

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume13906 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference21st International Conference on Applied Cryptography and Network Security, ACNS 2023
Country/TerritoryJapan
CityKyoto
Period19/06/2322/06/23

Bibliographical note

Publisher Copyright:
© 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

Keywords

  • Garbled Circuits
  • Gate-by-Gate Garbling
  • Random Oracles

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