Sharemind: A Framework for Fast Privacy-Preserving Computations

  • Authors:
  • Dan Bogdanov;Sven Laur;Jan Willemson

  • Affiliations:
  • University of Tartu, Tartu, Estonia 50409 and Cybernetica AS, Tallinn, Estonia 12618;University of Tartu, Tartu, Estonia 50409;University of Tartu, Tartu, Estonia 50409 and Cybernetica AS, Tallinn, Estonia 12618

  • Venue:
  • ESORICS '08 Proceedings of the 13th European Symposium on Research in Computer Security: Computer Security
  • Year:
  • 2008

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Abstract

Gathering and processing sensitive data is a difficult task. In fact, there is no common recipe for building the necessary information systems. In this paper, we present a provably secure and efficient general-purpose computation system to address this problem. Our solution--Sharemind--is a virtual machine for privacy-preserving data processing that relies on share computing techniques. This is a standard way for securely evaluating functions in a multi-party computation environment. The novelty of our solution is in the choice of the secret sharing scheme and the design of the protocol suite. We have made many practical decisions to make large-scale share computing feasible in practice. The protocols of Sharemindare information-theoretically secure in the honest-but-curious model with three computing participants. Although the honest-but-curious model does not tolerate malicious participants, it still provides significantly increased privacy preservation when compared to standard centralised databases.