Multi-clients verifiable computation via conditional disclosure of secrets

Rishabh Bhadauria, Carmit Hazay

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

1 Scopus citations

Abstract

In this paper, we explore the connection between two-party conditional disclosure of secrets (CDS) and verifiable computation. Here, the integrity mechanism underlying CDS is leveraged to ensure two-clients verifiable computation, where the computation is outsourced to an external server by two clients that share the input to the function. Basing integrity on CDS enjoys several significant advantages such as non-interactivity, constant rate communication complexity, a simple verification procedure, easily batched, and more. In this work, we extend the definition of plain CDS, considering two additional security properties of privacy and obliviousness that respectively capture input and output privacy. We then show that these extended notions of CDS are useful for designing secure two-party protocols in the presence of an untrusted third party. We complement the above with a sequence of new CDS constructions for a class of predicates of interest, including private set-intersection (PSI) and set-union cardinality, comparison, range predicate, and more. Based on these constructions we design new non-interactive constant-rate protocols for comparing two strings based on symmetric-key cryptography, and without requiring bit-decomposition. We additionally design new protocols for PSI cardinality and PSI based on recent work by Le, Ranellucci, and Gordon (CCS 2019) with similar advantages.

Original languageEnglish
Title of host publicationSecurity and Cryptography for Networks - 12th International Conference, SCN 2020, Proceedings
EditorsClemente Galdi, Vladimir Kolesnikov
PublisherSpringer Science and Business Media Deutschland GmbH
Pages150-171
Number of pages22
ISBN (Print)9783030579890
DOIs
StatePublished - 2020
Event12th International Conference on Security and Cryptography for Networks, SCN 2020 - Amalfi, Italy
Duration: 14 Sep 202016 Sep 2020

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume12238 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference12th International Conference on Security and Cryptography for Networks, SCN 2020
Country/TerritoryItaly
CityAmalfi
Period14/09/2016/09/20

Bibliographical note

Publisher Copyright:
© Springer Nature Switzerland AG 2020.

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