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Location Obscuring Techniques in Geopriv for Enhanced Privacy

This document outlines the goals of location obscuring techniques detailed by Martin Thomson at IETF-79. It discusses methods for selecting an obscuring distance, where a series of known locations is utilized to confuse or limit the accuracy of location data provided to recipients. The process results in reported locations that protect user privacy while addressing challenges such as update triggers, uncertainty, and the non-uniform nature of Earth’s surface. Various interpolation techniques and their implementations are explored as tools to ensure a uniform distribution of location offsets.

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Location Obscuring Techniques in Geopriv for Enhanced Privacy

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  1. Location Obscuring draft-thomson-geopriv-location-obscuring GEOPRIV, IETF-79 Martin Thomson

  2. Goals • Pick an obscuring distance. • Take a series of known locations, which might have greater accuracy than the recipient is permitted to receive. • The obscuring process produces a series of reported locations.

  3. Static Case

  4. Constant Updates

  5. When to Update

  6. When to Update: Whoops

  7. Hidden Trigger

  8. Varying Hidden Trigger

  9. Problem

  10. Very Small Uncertainty

  11. Recast Problem

  12. Continuous Random Field

  13. Interpolation A B C D

  14. But the Earth isn’t flat

  15. Skewed Interpolation grid / cos(latitude) A B C D grid / cos(latitude)

  16. Uniform Distributed Interpolation P(r) t=0.5 r = a(1-t) + bt t=0.3 t=0.2 t=0.1 Goal: Uniform distribution of offset a b

  17. Interpolation

  18. Demonstration… http://held-location.sourceforge.net/js_geoshape/maptest.html

  19. Alternative

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