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Building a RAPPOR with the Unknown: Privacy-Preserving Learning of Associations and Data Dictionaries

Fanti, Giulia, Pihur, Vasyl, Erlingsson, Úlfar·2016·Proceedings on Privacy Enhancing Technologies

Abstract

Techniques based on randomized response enable the collection of potentially sensitive data from clients in a privacy-preserving manner with strong local differential privacy guarantees. A recent such technology, RAPPOR [12], enables estimation of the marginal frequencies of a set of strings via privacy-preserving crowdsourcing. However, this original estimation process relies on a known dictionary of possible strings; in practice, this dictionary can be extremely large and/or unknown. In this paper, we propose a novel decoding algorithm for the RAPPOR mechanism that enables the estimation of “unknown unknowns,” i.e., strings we do not know we should be estimating. To enable learning without explicit dictionary knowledge, we develop methodology for estimating the joint distribution of multiple variables collected with RAPPOR. Our contributions are not RAPPOR-specific, and can be generalized to other local differential privacy mechanisms for learning distributions of string-valued random variables.

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Metadata

Authors
Fanti, G., Pihur, V., & Erlingsson, Ú.
Venue
Proceedings on Privacy Enhancing Technologies
Published
2016-05-06
Volume
2016
Issue
3
Pages
41-61
ISSN
2299-0984
OpenAlex
W2964225135
Cited by
275
References
3
FWCI
26.56
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Building a RAPPOR with the Unknown: Privacy-Preserving Learning of Associations and Data Dictionaries. https://app.cochat.ai/papers/10.1515/popets-2016-0015
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Fanti, G., Pihur, V., & Erlingsson, Ú. (2016). Building a RAPPOR with the Unknown: Privacy-Preserving Learning of Associations and Data Dictionaries. Proceedings on Privacy Enhancing Technologies. https://doi.org/10.1515/popets-2016-0015

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