Privacy preserving data release for tagging recommender systems

Zhu, T, Li, G, Ren, Y, Zhou, W and Xiong, P 2015, 'Privacy preserving data release for tagging recommender systems', Web Intelligence, vol. 13, no. 4, pp. 229-246.


Document type: Journal Article
Collection: Journal Articles

Title Privacy preserving data release for tagging recommender systems
Author(s) Zhu, T
Li, G
Ren, Y
Zhou, W
Xiong, P
Year 2015
Journal name Web Intelligence
Volume number 13
Issue number 4
Start page 229
End page 246
Total pages 18
Publisher I O S Press
Abstract Tagging recommender systems allow Internet users to annotate resources with personalized tags. The connection among users, resources and these annotations, often called a folksonomy, permits users the freedom to explore tags, and to obtain recommendations. Releasing these tagging datasets accelerates both commercial and research work on recommender systems. However, tagging recommender systems has been confronted with serious privacy concerns because adversaries may re-identify a user and her/his sensitive information from the tagging dataset using a little background information. Recently, several private techniques have been proposed to address the problem, but most of them lack a strict privacy notion, and can hardly resist the number of possible attacks. This paper proposes an private releasing algorithm to perturb users' profile in a strict privacy notion, differential privacy, with the goal of preserving a user's identity in a tagging dataset. The algorithm includes three privacy-preserving operations: Private Tag Clustering is used to shrink the randomized domain and Private Tag Selection is then applied to find the most suitable replacement tags for the original tags. To hide the numbers of tags, the third operation, Weight Perturbation, finally adds Laplace noise to the weight of tags. We present extensive experimental results on two real world datasets, De.licio.us and Bibsonomy. While the personalization algorithm is successful in both cases, our results further suggest the private releasing algorithm can successfully retain the utility of the datasets while preserving users' identity.
Subject Information Retrieval and Web Search
Keyword(s) differential privacy
Privacy preserving
recommender system
tagging
DOI - identifier 10.3233/WEB-150323
Copyright notice © 2015 - IOS Press and the authors. All rights reserved.
ISSN 2405-6456
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