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On the geometry of differential privacy

Open access
Hardt, Moritz, Talwar, Kunal·2010·Proceedings of the forty-second ACM symposium on Theory of computing

Abstract

We consider the noise complexity of differentially private mechanisms in the setting where the user asks d linear queries f:Rn -> R non-adaptively. Here, the database is represented by a vector in R and proximity between databases is measured in the l1-metric. We show that the noise complexity is determined by two geometric parameters associated with the set of queries. We use this connection to give tight upper and lower bounds on the noise complexity for any d ≤ n. We show that for d random linear queries of sensitivity 1, it is necessary and sufficient to add l2-error Θ(min d√d/ε,d√(log (n/d))/ε) to achieve ε-differential privacy. Assuming the truth of a deep conjecture from convex geometry, known as the Hyperplane conjecture, we can extend our results to arbitrary linear queries giving nearly matching upper and lower bounds.

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Metadata

Authors
Hardt, M., & Talwar, K.
Venue
Proceedings of the forty-second ACM symposium on Theory of computing
Publisher
ACM
Published
2010-06-05
Pages
705-714
OpenAlex
W2141902405
Cited by
314
References
4
FWCI
18.97
Type
conference paper
Language
en
Open access
green

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