2012

The Geometry of Differential Privacy: the Sparse and Approximate Cases

Nikolov, Aleksandar, Talwar, Kunal, Zhang, Li

Understand

In this work, we study trade-offs between accuracy and privacy in the context of linear queries over histograms.

  • This is a rich class of queries that includes contingency tables and range queries, and has been a focus of a long line of work.
  • For a set of $d$ linear queries over a database $x \in \R^N$, we seek to find the differentially private mechanism that has the minimum mean squared error.
  • For pure differential privacy, an $O(\log^2 d)$ approximation to the optimal mechanism is known.

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