Privacy-Aware Task Allocation and Data Aggregation in Fog-Assisted Spatial Crowdsourcing

Haiqin Wu, Liangmin Wang, Guoliang Xue

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Spatial crowdsourcing (SC) enables task owners (TOs) to outsource spatial-related tasks to a SC-server who engages mobile users in collecting sensing data at some specified locations with their mobile devices. Data aggregation, as a specific SC task, has drawn much attention in mining the potential value of the massive spatial crowdsensing data. However, the release of SC tasks and the execution of data aggregation may pose considerable threats to the privacy of TOs and mobile users, respectively. Besides, it is nontrivial for the SC-server to allocate numerous tasks efficiently and accurately to qualified mobile users, as the SC-server has no knowledge about the entire geographical user distribution. To tackle these issues, in this paper, we introduce a fog-assisted SC architecture, in which many fog nodes deployed in different regions can assist the SC-server to distribute tasks and aggregate data in a privacy-aware manner. Specifically, a privacy-aware task allocation and data aggregation scheme (PTAA) is proposed leveraging bilinear pairing and homomorphic encryption. PTAA supports representative aggregate statistics (e.g., sum, mean, variance, and minimum) with efficient data update while providing strong privacy protection. Security analysis shows that PTAA can achieve the desirable security goals. Extensive experiments also demonstrate its feasibility and efficiency.

Original languageEnglish (US)
Article number8611203
Pages (from-to)589-602
Number of pages14
JournalIEEE Transactions on Network Science and Engineering
Issue number1
StatePublished - Jan 1 2020


  • Spatial crowdsourcing
  • bilinear pairing
  • data aggregation
  • fog computing
  • homomorphic encryption

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Computer Networks and Communications


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