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Location-sharing technologies: Privacy risks and controls

Location-sharing technologies: Privacy risks and controls. Lorrie Faith Cranor. Outline. Locating Technologies Location Risk/Benefit Survey Location-Sharing Applications and Privacy Controls Locaccino. Locating Technologies. Global Positioning System. WiFi Positioning.

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Location-sharing technologies: Privacy risks and controls

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  1. Location-sharing technologies: Privacy risks and controls Lorrie Faith Cranor

  2. Outline • Locating Technologies • Location Risk/Benefit Survey • Location-Sharing Applications and Privacy Controls • Locaccino

  3. Locating Technologies

  4. Global Positioning System

  5. WiFi Positioning

  6. Cellular Triangulation

  7. IP Location

  8. Locating Technologies • Platforms • Laptop computers • Mobile phones • Applications • Advertising/Marketing • Location-based advertising • Information services • Directions • Find the nearest … • Local weather, local events • People finding • Meet new friends, play games, socialize • Coordination • Monitor kids, employees, elderly

  9. Location Risk/Benefit Survey

  10. Method • Conducted April 2008, n = 587 • Provided list of use scenarios • Rate the likelihood of scenario • Rate the magnitude of harm or benefits • Ranked each risk/benefitExpected Utility = Likelihood * Magnitude

  11. Location-Sharing Applications • Not very useful • People are concerned about their privacy • Risks outweigh benefits

  12. Benefit Scenarios

  13. Risk Scenarios

  14. Location-Sharing Applications and Privacy Controls

  15. Privacy features • Most current location sharing services allow sharing to be either on or off, per person • Many have a “make me invisible feature” (e.g. Loopt and Brightkite) • Some have the ability to limit by location granularity (e.g. Google Latitude and FireEagle) • Commercial services don’t have fine-grained privacy controls or ability to see who is tracking your location

  16. Loopt privacy settings

  17. Loopt privacy settings

  18. Google Lattitude privacy settings

  19. Google Lattitude privacy settings

  20. Google Lattitude privacy settings

  21. Location-Sharing Applications • Reviewed 89 Applications in August 2009 • Date of Launch • Privacy Policy • Privacy Controls • Immediately Accessible Privacy Settings

  22. Privacy Overview • Types of Applications • Open: Requested by anyone (52) • Closed: Requested by friends only (29)

  23. Types of Restrictions • Friends Only (49.4%) • Granularity (11.2%) • Blacklist (15.7%) • Invisible (33.7%) % of applications

  24. Types of Restrictions • Per-Request (2.25%) • Time-Expiring (2.25%)

  25. Most Frequent Controls • Friends Only (49.4%) • Invisible (33.7%) % of applications

  26. Privacy Controls • Frequency of Restrictions

  27. Best ways to mitigate the greatest expected risks • Blacklist (16%) • Granularity (12%) • Group-based rules (12%) • Location-based rules (1%) • Time-based rules (1%) % of applications

  28. Recommendations for developers • Need for more expressive privacy controls in most applications • Providing expressive controls could reduce concerns • Developers must balance expressiveness and user burden

  29. Recommendations for users • Understand why you want to use location-sharing application (social, coordination, etc.) • Find application well-suited to your needs • Configure privacy controls • Avoid public posting of your location with your real name

  30. http://locaccino.org

  31. Friends around me

  32. Editing rules

  33. Editing location restrictions

  34. Who can see me?

  35. Inviting friends

  36. Clients Android Symbian Mac + PC

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