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Private Algorithms Can Always Be Extended
Christian Borgs, Jennifer Chayes, Adam Smith, Ilias Zadik · 2018-10-30 · via math.ST updates on arXiv.org

We consider the following fundamental question on $ε$-differential privacy. Consider an arbitrary $ε$-differentially private algorithm defined on a subset of the input space. Is it possible to extend it to an $ε'$-differentially private algorithm on the whole input space for some $ε'$ comparable with $ε$? In this note we answer affirmatively this question for $ε'=2ε$. Our result applies to every input metric space and space of possible outputs. This result originally appeared in a recent paper by the authors [BCSZ18]. We present a self-contained version in this note, in the hopes that it will be broadly useful.

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