Representation Learning for High-Dimensional Data Collection under Local Differential Privacy

• URL: http://arxiv.org/abs/2010.12464v3
• Date: Sat, 14 May 2022 11:38:04 GMT
• Title: Representation Learning for High-Dimensional Data Collection under Local Differential Privacy
• Authors: Alex Mansbridge, Gregory Barbour, Davide Piras, Michael Murray, Christopher Frye, Ilya Feige, David Barber
• Abstract summary: Local differential privacy (LDP) offers a rigorous approach to preserving privacy. Existing LDP mechanisms have successfully been applied to low-dimensional data. In high dimensions the privacy-inducing noise largely destroys the utility of the data.
• Score: 18.98782927283319
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The collection of individuals' data has become commonplace in many industries. Local differential privacy (LDP) offers a rigorous approach to preserving privacy whereby the individual privatises their data locally, allowing only their perturbed datum to leave their possession. LDP thus provides a provable privacy guarantee to the individual against both adversaries and database administrators. Existing LDP mechanisms have successfully been applied to low-dimensional data, but in high dimensions the privacy-inducing noise largely destroys the utility of the data. In this work, our contributions are two-fold: first, by adapting state-of-the-art techniques from representation learning, we introduce a novel approach to learning LDP mechanisms. These mechanisms add noise to powerful representations on the low-dimensional manifold underlying the data, thereby overcoming the prohibitive noise requirements of LDP in high dimensions. Second, we introduce a novel denoising approach for downstream model learning. The training of performant machine learning models using collected LDP data is a common goal for data collectors, and downstream model performance forms a proxy for the LDP data utility. Our approach significantly outperforms current state-of-the-art LDP mechanisms.

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