From: rick hoselton <hoz@univel.telescan.com>
To: cypherpunks@toad.com
Message Hash: a312f800b6328c0fcdb47a1d132ae7430817cf621cdd21a5f2a956f445f4d8c1
Message ID: <199604102136.OAA12316@toad.com>
Reply To: N/A
UTC Datetime: 1996-04-11 07:21:51 UTC
Raw Date: Thu, 11 Apr 1996 15:21:51 +0800
From: rick hoselton <hoz@univel.telescan.com>
Date: Thu, 11 Apr 1996 15:21:51 +0800
To: cypherpunks@toad.com
Subject: Re: No matter where you go, there they are.
Message-ID: <199604102136.OAA12316@toad.com>
MIME-Version: 1.0
Content-Type: text/plain
At 10:04 AM 4/10/96 -0400, Peter Wayner wrote:
>
>Hmm. Here's an interesting question. Let's say that there are 3
>satellites in view broadcasting signals f1(t), f2(t) and f3(t).
>...Okay, so why can't I just tape the signals I get from each of
>the three satellites.
>Or course, I could be completely missing some neat feature of
>DGPS. ... Any thoughts?
I have read that GPS uses encryption to place time-dependent,
location-dependent inaccuracies into the signals. Innacuracies
small enough so they are not a problem for civilian navigation,
(mostly) but large enough to prevent GPS from being a useful method
of military targeting for anyone who does not hold the keys.
Perhaps Ms. Denning is suggesting that the US feral government could
act as a "trusted server" (and she has repeatedly suggested such trust)
and tell us whether a GPS that "thinks" it's at some location, right now,
is REALLY at some known location.
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1996-04-11 (Thu, 11 Apr 1996 15:21:51 +0800) - Re: No matter where you go, there they are. - rick hoselton <hoz@univel.telescan.com>