Re: IP address <--> Global Positioning System (GPS)
From: Lassi Hippeläinen (lahippel@ieee.orgies.invalid)Date: 05/30/02
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From: Lassi Hippeläinen <lahippel@ieee.orgies.invalid> Date: Thu, 30 May 2002 10:53:30 GMT
Iwo Mergler wrote:
<...>
> After finally reading that paper, it is *not* position information
> which gets transmitted.
You've done more than me, I admit, but I'll provide my two cents
anyway...
> The authentication data is a short sample
> of the GPS IF signal, which has a bandwidth of about 1MHz. This
> sample contains all satellite signals simultaneously.
>
> According to the authors, the idea works only when the samples
> taken at host and client (at the same time) contain a few
> identical satellites. This restricts the scheme to about 2000Km
> range, most likely less. For more than that, they suggest trusted
> 'relays'.
So the pretender has to install an antenna close to the host antenna?
Not necessarily in the same floor of the building. The antenna relays
the received signal to another, more convenient place...
<...>
> With this in mind, I believe that it is only necessary to generate
> a valid GPS signal for a arbitrary location to break the system.
> This can be done in software, offline and in advance. It is possible
> to compute the GPS signal for a given location in advance - for
> the whole day if needed (it's < 2GBytes/hour). A modern PC
> may even be capable to do it in real time, but I'm not completely
> convinced about that.
Seems like an easy task for a signal processor.
-- Lassi
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