Papers › General-Purpose f-DP Estimation and Auditing in a Black-Box Setting
General-Purpose f-DP Estimation and Auditing in a Black-Box Setting
Önder Askin, Holger Dette, Martin Dunsche, Tim Kutta, Yun Lu, Yu Wei, Vassilis Zikas
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In this paper we propose new methods to statistically assess f-Differential Privacy (f-DP), a recent refinement of differential privacy (DP) that remedies certain weaknesses of standard DP (including tightness under algorithmic composition). A challenge when deploying differentially private mechanisms is that DP is hard to validate, especially in the black-box setting. This has led to numerous empirical methods for auditing standard DP, while f-DP remains less explored. We introduce new black-box methods for f-DP that, unlike existing approaches for this privacy notion, do not require prior knowledge of the investigated algorithm. Our procedure yields a complete estimate of the f-DP trade-off curve, with theoretical guarantees of convergence. Additionally, we propose an efficient auditing method that empirically detects f-DP violations with statistical certainty, merging techniques from non-parametric estimation and optimal classification theory. Through experiments on a range of DP mechanisms, we demonstrate the effectiveness of our estimation and auditing procedures.
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