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Location Obscuring

Location Obscuring. draft- thomson -geopriv-location-obscuring GEOPRIV, IETF-79 Martin Thomson. Goals. Pick an obscuring distance . Take a series of known locations , which might have greater accuracy than the recipient is permitted to receive.

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Location Obscuring

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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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