[145292] in cryptography@c2.net mail archive
Re: Spy/Counterspy
daemon@ATHENA.MIT.EDU (Pawel)
Fri Jul 9 13:36:53 2010
From: Pawel <pawel.veselov@gmail.com>
To: "Peter Gutmann (alt)" <pgut001.reflector@gmail.com>
In-Reply-To: <u2n44da907e1004270538s6bec6f3fx3174f8a79a2b3c30@mail.gmail.com>
Date: Fri, 9 Jul 2010 10:00:31 -0700
Cc: "cryptography@metzdowd.com" <cryptography@metzdowd.com>
Hi,
On Apr 27, 2010, at 5:38 AM, "Peter Gutmann (alt)" <pgut001.reflector@gmail.com
> wrote:
> GPS tracking units that you can fit to your car to track where your
> kids are
> taking it (or *cough* other purposes) have been around for awhile
> now. It's
> interesting to see that recently the sorts of places that'll sell
> you card
> skimmers and RFID cloners have started selling miniature GPS jammers
> that plug
> into cigarette-lighter sockets on cars (general-purposes ones using
> internal
> batteries have been around for awhile). In other words these are
> specifically
> designed to stop cars from being tracked.
>
> (Some of the more sophisticated trackers will fall back to 3G GSM-
> based
> tracking via UMTS modems if they lose the GPS signal, it'll be
> interested to
> see how long it takes before the jammers are updated to deal with 3G
> signals
> as well, hopefully while leaving 2G intact for phonecalls).
Just wondering, why wouldn't GPS trackers use 2G to determine the
location?
And, also, does it even need a cell service subscription for location
determination, or is it enough to query the cell towers (through some
handshake protocols) to figure out the proximities and coordinates?
>
> Peter.
Thanks,
Pawel.
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