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Issue No. 04 - July-Aug. (2018 vol. 15)
ISSN: 1545-5971
pp: 646-660
Huaxin Li , Department of Computer Science and Engineering, Shanghai Key Laboratory of Scalable Computing and Systems, Shanghai Jiao Tong University, Shanghai, China
Haojin Zhu , Department of Computer Science and Engineering, Shanghai Key Laboratory of Scalable Computing and Systems, Shanghai Jiao Tong University, Shanghai, China
Suguo Du , Antai College of Economics & Management, Shanghai Jiao Tong University, Shanghai, China
Xiaohui Liang , Computer Science Department, University of Massachusetts Boston, Boston, MA
Xuemin Sherman Shen , Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON, Canada
ABSTRACT
Along with the popularity of mobile social networks (MSNs) is the increasing danger of privacy breaches due to user location exposures. In this work, we take an initial step towards quantifying location privacy leakage from MSNs by matching the users’ shared locations with their real mobility traces. We conduct a three-week real-world experiment with 30 participants and discover that both direct location sharing (e.g., Weibo or Renren) and indirect location sharing (e.g., Wechat or Skout) can reveal a small percentage of users’ real points of interests (POIs). We further propose a novel attack to allow an external adversary to infer the demographics (e.g., age, gender, education) after observing users’ exposed location profiles. We implement such an attack in a large real-world dataset involving 22,843 mobile users. The experimental results show that the attacker can effectively predict demographic attributes about users with some shared locations. To resist such attacks, we propose SmartMask, a context-based system-level privacy protection solution, designed to automatically learn users’ privacy preferences under different contexts and provide a transparent privacy control for MSN users. The effectiveness and efficiency of SmartMask have been well validated by extensive experiments.
INDEX TERMS
Privacy, Mobile communication, Mobile computing, Context, Facebook, Geology
CITATION

H. Li, H. Zhu, S. Du, X. Liang and X. S. Shen, "Privacy Leakage of Location Sharing in Mobile Social Networks: Attacks and Defense," in IEEE Transactions on Dependable and Secure Computing, vol. 15, no. 4, pp. 646-660, 2018.
doi:10.1109/TDSC.2016.2604383
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