Adjusting the trade-off between privacy guarantees and computational cost in secure hardware PIR

Spiridon Bakiras, Konstantinos F. Nikolopoulos

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

1 Citation (Scopus)

Abstract

Database queries present a potential privacy risk to users, as they may disclose sensitive information about the person issuing the query. Consequently, privacy preserving query processing has gained significant attention in the literature, and numerous techniques have been proposed that seek to hide the content of the queries from the database server. Secure hardware-assisted private information retrieval (PIR) is currently the only practical solution that can be leveraged to build algorithms that provide perfect privacy. Nevertheless, existing approaches feature amortized page retrieval costs and, for large databases, some queries may lead to excessive delays, essentially taking the database server offline for large periods of time. In this paper, we address this drawback and introduce a novel approach that sacrifices some degree of privacy in order to provide fast and constant query response times. Our method leverages the internal cache of the secure hardware to constantly reshuffle the database pages in order to create sufficient uncertainty regarding the exact location of an arbitrary page. We give a formal definition of the privacy level of our algorithm and illustrate how to enforce it in practice. Based on the performance characteristics of the current state-of-the-art secure hardware platforms, we show that our method can provide low page access times, even for very large databases.

Original languageEnglish
Title of host publicationSecure Data Management - 8th VLDB Workshop, SDM 2011, Proceedings
Pages128-144
Number of pages17
DOIs
Publication statusPublished - 19 Sep 2011
Event8th VLDB Workshop on Secure Data Management, SDM 2011 - Seattle, WA, United States
Duration: 2 Sep 20112 Sep 2011

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume6933 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Other

Other8th VLDB Workshop on Secure Data Management, SDM 2011
CountryUnited States
CitySeattle, WA
Period2/9/112/9/11

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ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

Cite this

Bakiras, S., & Nikolopoulos, K. F. (2011). Adjusting the trade-off between privacy guarantees and computational cost in secure hardware PIR. In Secure Data Management - 8th VLDB Workshop, SDM 2011, Proceedings (pp. 128-144). (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); Vol. 6933 LNCS). https://doi.org/10.1007/978-3-642-23556-6_9