[cryptography] Mobile Devices and Location Information as Entropy?

Kevin W. Wall kevin.w.wall at gmail.com
Sat Apr 2 04:15:42 EDT 2011

On 04/02/2011 04:10 AM, Jeffrey Walton wrote:
> Hi Guys,
> Given a mobile device with GPS location data available, is there any
> benefit to using the location data as an entropy source?
> I'm wondering how useful GPS coordinates are if an adversary can
> determine location by triangulating a carrier's cell tower data.

Over some duration (assuming said GPS is on the move) or just at
some single fixed point in time?

At most, I would think you'd only be able to collect a few bits.
And I would think an adversary who has observed your travel patterns
might be able to exploit just about anything if your movements
are more or less predictable.

Kevin W. Wall
"The most likely way for the world to be destroyed, most experts agree,
is by accident. That's where we come in; we're computer professionals.
We cause accidents."        -- Nathaniel Borenstein, co-creator of MIME

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