Colored Noise Mechanism for Differentially Private Clustering
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The goal of this paper is to propose and analyze a differentially private randomized mechanism for the K-means query. The goal is to ensure that the information received about the cluster-centroids is differentially private. The method consists in adding Gaussian noise with an optimum covariance. The main result of the paper is the analytical solution for the optimum covariance as a function of the database. Comparisons with the state of the art prove the efficacy of our approach.
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