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The Bounded Laplace Mechanism in Differential Privacy

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arxiv 1808.10410 v1 pith:T5NA4VFY submitted 2018-08-30 cs.CR

The Bounded Laplace Mechanism in Differential Privacy

classification cs.CR
keywords mechanismdifferentiallaplaceprivacyboundingsupportparametersvalues
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Laplace mechanism is the workhorse of differential privacy, applied to many instances where numerical data is processed. However, the Laplace mechanism can return semantically impossible values, such as negative counts, due to its infinite support. There are two popular solutions to this: (i) bounding/capping the output values and (ii) bounding the mechanism support. In this paper, we show that bounding the mechanism support, while using the parameters of the pure Laplace mechanism, does not typically preserve differential privacy. We also present a robust method to compute the optimal mechanism parameters to achieve differential privacy in such a setting.

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Cited by 2 Pith papers

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  1. PLRV-O: Advancing Differentially Private Deep Learning via Privacy Loss Random Variable Optimization

    cs.CR 2025-09 reject novelty 7.0

    PLRV-O replaces Gaussian noise in DP-SGD with a randomized-scale Laplace distribution and claims large accuracy gains at epsilon under 1, but the privacy accounting likely underestimates the true privacy loss due to s...

  2. Diffprivlib: The IBM Differential Privacy Library

    cs.CR 2019-07 unverdicted novelty 5.0

    The paper presents Diffprivlib as the first unifying open-source Python library implementing differential privacy mechanisms and applications for data analytics and machine learning.