Private Join and Compute from PIR with Default

Tancrède Lepoint, Sarvar Patel, Mariana Raykova, Karn Seth, Ni Trieu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The private join and compute (PJC) functionality enables secure computation over data distributed across different databases, and is applicable to a wide range of applications, many of which address settings where the input databases are of significantly different sizes. We introduce the notion of private information retrieval (PIR) with default, which enables two-party PJC functionalities in a way that hides the size of the intersection of the two databases and incurs sublinear communication cost in the size of the bigger database. We provide two constructions for this functionality, one of which requires offline linear communication, which can be amortized across queries, and one that provides sublinear cost for each query but relies on more computationally expensive tools. We construct inner-product PJC, which has applications to ads conversion measurement and contact tracing, relying on an extension of PIR with default. We evaluate the efficiency of our constructions, which can enable 28 PIR with default lookups on a database of size 225 (or inner-product PJC on databases with such sizes) with the communication of 44 MB, which costs less than 0.17 c. for the client and 26.48 c. for the server.

Original languageEnglish (US)
Title of host publicationAdvances in Cryptology – ASIACRYPT 2021 - 27th International Conference on the Theory and Application of Cryptology and Information Security, Proceedings, Part 2
EditorsMehdi Tibouchi, Huaxiong Wang
PublisherSpringer Science and Business Media Deutschland GmbH
Pages605-634
Number of pages30
ISBN (Print)9783030920746
DOIs
StatePublished - 2021
Event27th International Conference on Theory and Application of Cryptology and Information Security, ASIACRYPT 2021 - Virtual, Online
Duration: Dec 6 2021Dec 10 2021

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume13091 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference27th International Conference on Theory and Application of Cryptology and Information Security, ASIACRYPT 2021
CityVirtual, Online
Period12/6/2112/10/21

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

Fingerprint

Dive into the research topics of 'Private Join and Compute from PIR with Default'. Together they form a unique fingerprint.

Cite this