Denning's Geo-crypto

[Sunder]

Um, rethorical question, but from my very limited understanding of GPS,
all the satelites do is send a series of time codes.  So if you wanted to
you could build several transmitters that sent out stuff on the same
frequenies.  Since you need to be outside to be able to use GPS, or at
least "see sky", that would imply that these signals are weak.  So
building something to spoof GPS should be relatively easy.

Seems to me that one could also easily build a system to "brute
force" through all possible positions on GPS.

Again, I emphasize "very limited understanding of GPS" :)

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On Thu, 22 Nov 2001, Roy M. Silvernail wrote:

> On 22 Nov 2001, at 11:06, John Young wrote:
> 
> > Time Magazine, November 26, 2001:
> > 
> > Denning's pioneering a new field she calls geo-encryption.
> > Working with industry, Denning has developed a way to keep
> > information undecipherable until it reaches its location, as
> > determined by GPS satellites. 
> 
> Using a GPS coordinate set as keying material?  Hope it's just 
> additional keying material.  Knowing the intended destination of 
> something like a movie in transit to a theater seems pretty easy, 
> and the set of GPS coordinates encompassing your average 
> multiplex would seem to be pretty small compared to the usual 
> keyspaces discussed here.
> --
>            Roy M. Silvernail     [ ]     roy at scytale.com
> DNRC Minister Plenipotentiary of All Things Confusing, Software Division
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