• Identifying unsafe routes for network-based trajectory privacy 

      Gkoulalas-Divanis, A.; Verykios, V. S.; Mokbel, M. F. (2009)
      In this paper, we propose a privacy model that offers trajectory privacy to the requesters of Location-Based Services (LBSs), by utilizing an underlying network of user movement. The privacy model has been implemented as ...
    • PLOT: Privacy in location based services: An open-ended toolbox 

      Gkoulalas-Divanis, A.; Verykios, V. S.; Eleftheriou, D. (2009)
      The widespread adoption of Location Based Services (LBSs) coupled with recent advances in location tracking technologies, pose serious concerns to user privacy. As a consequence, privacy preserving approaches have been ...
    • Time-optimized user grouping in Location Based Services 

      Anagnostopoulos, C.; Hadjiefthymiades, S.; Kolomvatsos, K. (2015)
      We focus on Location Based Services (LBSs) which deliver information to groups of mobile users based on their spatial context. The existence (and non-trivial lifetime) of groups of mobile users can simplify the operation ...