LoPub: High-dimensional crowdsourced data publication with local differential privacy

Xuebin Ren, Chia Mu Yu, Weiren Yu, Shusen Yang*, Xinyu Yang, Julie A. McCann, Philip S. Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

High-dimensional crowdsourced data collected from numerous users produces rich knowledge about our society; however, it also brings unprecedented privacy threats to the participants. Local differential privacy (LDP), a variant of differential privacy, is recently proposed as a state-of-the-art privacy notion. Unfortunately, achieving LDP on high-dimensional crowdsourced data publication raises great challenges in terms of both computational efficiency and data utility. To this end, based on the expectation maximization (EM) algorithm and Lasso regression, we first propose efficient multi-dimensional joint distribution estimation algorithms with LDP. Then, we develop a local differentially private high-dimensional data publication algorithm (LoPub) by taking advantage of our distribution estimation techniques. In particular, correlations among multiple attributes are identified to reduce the dimensionality of crowdsourced data, thus speeding up the distribution learning process and achieving high data utility. Extensive experiments on real-world datasets demonstrate that our multivariate distribution estimation scheme significantly outperforms existing estimation schemes in terms of both communication overhead and estimation speed. Moreover, LoPub can keep, on average, 80% and 60% accuracy over the released datasets in terms of support vector machine and random forest classification, respectively.

Original languageEnglish
Pages (from-to)2151-2166
Number of pages16
JournalIEEE Transactions on Information Forensics and Security
Volume13
Issue number9
DOIs
StatePublished - Sep 2018

Keywords

  • crowdsourced data
  • data publication
  • high-dimensional data
  • Local differential privacy
  • private data release

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