[92648] in Cypherpunks
Re: Location Escrow anyone ?
daemon@ATHENA.MIT.EDU (Steve Schear)
Sat Jan 3 13:22:44 1998
In-Reply-To: <19980103133555.12753.qmail@nym.alias.net>
Date: Sat, 3 Jan 1998 09:39:14 -0800
To: Kay Ping <kping@nym.alias.net>, cypherpunks@toad.com
From: Steve Schear <schear@lvdi.net>
Reply-To: Steve Schear <schear@lvdi.net>
At 1:35 PM +0000 1/3/98, Kay Ping wrote:
>-----BEGIN PGP SIGNED MESSAGE-----
>
>>>ZURICH (December 28, 1997 4:12 p.m. EST http://www.nando.net) - Swiss
>>>police have secretly tracked the whereabouts of mobile phone users via a
>>>telephone company computer that records billions of movements going back
>>>more than half a year, a Sunday newspaper reported.
>>
>>Don't be fooled that this is a swiss only problem. It's being done here in
>>Amerika right now.
>
>The FCC has issued a ruling that will require all cellular telephone
>carriers to provide location information on all 911 calls. By the year
>2001, this location information is to provide 125 metres of accuracy 67%
>of the time.
The FCC may have ruled it, but its doubtful that the carriers can provide=
it. Doing better than than a cell sector will depend on many factors,=
including: specific technology (analog, GSM, CDMA, etc.), frequency and=
local propagation characteristics, especially multipath conditions.
=46rom parallel discussions on the cryptography list:
800 MHz analog may be the most difficult. GSM perhaps can reach 500 meteres=
under ideal conditions (Andreas Bogk). IS-95/CDMA probably a bit better=
than GSM due to the very high data (chip) rate and spread spectrum's better=
multipath characteristics, although the system's multipath performance most=
improves communications not ranging (Phil Karn, Qualcomm).
--Steve
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