New Efficient Attacks on Statistical Disclosure Control Mechanisms

  • Authors:
  • Cynthia Dwork;Sergey Yekhanin

  • Affiliations:
  • Microsoft Research,;Microsoft Research,

  • Venue:
  • CRYPTO 2008 Proceedings of the 28th Annual conference on Cryptology: Advances in Cryptology
  • Year:
  • 2008

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Abstract

The goal of a statistical database is to provide statistics about a population while simultaneously protecting the privacy of the individual records in the database. The tension between privacy and usability of statistical databases has attracted much attention in statistics, theoretical computer science, security, and database communities in recent years. A line of research initiated by Dinur and Nissim investigates for a particular type of queries, lower bounds on the distortion needed in order to prevent gross violations of privacy. The first result in the current paper simplifies and sharpens the Dinur and Nissim result.The Dinur-Nissim style results are strong because they demonstrate insecurity of all low-distortion privacy mechanisms. The attacks have an all-or-nothing flavor: letting ndenote the size of the database, 茂戮驴(n) queries are made before anything is learned, at which point 茂戮驴(n) secret bits are revealed. Restricting attention to a wide and realistic subset of possible low-distortion mechanisms, our second result is a more acute attack, requiring only a fixed number of queries for each bit revealed.