[Geopriv] Issue raised with Geolocation Policy

[Hannes Tschofenig <Hannes.Tschofenig at gmx.net>]

Hi all,

Sam Hartman, our Security AD, reviewed the Geolocation Policy document
(see http://tools.ietf.org/html/draft-ietf-geopriv-policy-12).

Here is the issue he identified:

"

I'm trying to think about the mechanisms in section 6 of the geopriv
document for reducing the granularity of location.  I'm wonder though
how effective these mechanisms are in cases where in addition to
getting one-time location information I'm also seeing transitions in
location information.

As an example if I see a transition from one building to a near by
building, I may well know much more about the civic location than
granularity.

Similarly, I'm wondering how much information monitoring transitions
in geodetic location would help me in discovering where someone is in
the best case.  I.E. where they are near a discontinuity in the
rounding.
"

Thanks to Sam for providing a detailed review of our document.

In had a discussion with Sam about this issue. I agreed that some 
information is disclosed when you cross the boundaries. More information 
is disclosed when the user picks small regions for the boundary (e.g., 
only room numbers are not shown). I believe it is useful to document 
this issue.

So, I would need feedback from the group.
a) Do you think that this is indeed a problem?
b) If yes, how should we document this aspect?

Ciao
Hannes



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