Longitude: a privacy-preserving location sharing protocol for mobile applications

Changyu Dong, Naranker Dulay

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

12 Citations (Scopus)
24 Downloads (Pure)


Location sharing services are becoming increasingly popular. Although many location sharing services allow users to set up privacy policies to control who can access their location, the use made by service providers remains a source of concern. Ideally, location sharing providers and middleware should not be able to access users’ location data without their consent. In this paper, we propose a new location sharing protocol called Longitude that eases privacy concerns by making it possible to share a user’s location data blindly and allowing the user to control who can access her location, when and to what degree of precision. The underlying cryptographic algorithms are designed for GPS-enabled mobile phones. We describe and evaluate our implementation for the Nexus One Android mobile phone.
Original languageEnglish
Title of host publicationTrust Management V
Subtitle of host publication5th IFIP WG 11.11 International Conference, IFIPTM 2011, Copenhagen, Denmark, June 29 – July 1, 2011. Proceedings
EditorsIan Wakeman, Ehud Gudes, Christian Damsgaard Jensen, Jason Crampton
Number of pages16
Publication statusPublished - Jul 2011
Event4th IFIP WG International Conference - Morioka, Japan
Duration: 16 Jun 201018 Jun 2010


Other4th IFIP WG International Conference
Abbreviated titleIFIPTM 2010


  • mobile technology
  • mobile communications
  • location sharing protocol
  • mobile applications


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