Privacy-preserving multi-party access control

Mina Sheikhalishahi, Gamze Tillem, Zekeriya Erkin, Nicola Zannone

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

Abstract

Multi-party access control has been proposed to enable collaborative decision making for the protection of co-owned resources. In particular, multi-party access control aims to reconcile conflicts arising from the evaluation of policies authored by different stakeholders for jointly-managed resources, thus determining whether access to those resources should be granted or not. While providing effective solutions for the protection of co-owned resources, existing approaches do not address the protection of policies themselves, whose disclosure can leak sensitive information about, e.g., the relationships of co-owners with other parties. In this paper, we propose a privacy-preserving multi-party access control mechanism, which preserves the confidentiality of user policies. In particular, we propose secure computation protocols for the evaluation of multi-party policies, based on two privacy-preserving techniques, namely homomorphic encryption and secure function evaluation. An experimental evaluation of our approach shows its practical feasibility in terms of both computation and communication costs.

Original languageEnglish
Title of host publicationWPES 2019 - Proceedings of the 18th ACM Workshop on Privacy in the Electronic Society
Place of PublicationNew York
PublisherAssociation for Computing Machinery, Inc
Pages1-13
Number of pages13
ISBN (Electronic)978-1-4503-6830-8
DOIs
Publication statusPublished - 11 Nov 2019
Event18th ACM Workshop on Privacy in the Electronic Society, WPES 2019, co-located with the 26th ACM Conference on Computer and Communications Security, CCS 2019 - London, United Kingdom
Duration: 11 Nov 2019 → …

Conference

Conference18th ACM Workshop on Privacy in the Electronic Society, WPES 2019, co-located with the 26th ACM Conference on Computer and Communications Security, CCS 2019
Country/TerritoryUnited Kingdom
CityLondon
Period11/11/19 → …

Keywords

  • Collaborative systems
  • Homomorphic encryption
  • Secure function evaluation

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