[118749] in Cypherpunks
Re: Unplugged! The biggest hack in history (fwd)
daemon@ATHENA.MIT.EDU (Jim Choate)
Thu Oct 7 08:42:38 1999
From: Jim Choate <ravage@einstein.ssz.com>
Message-Id: <199910071235.HAA32210@einstein.ssz.com>
To: cypherpunks@einstein.ssz.com
Date: Thu, 7 Oct 1999 07:35:05 -0500 (CDT)
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Reply-To: Jim Choate <ravage@einstein.ssz.com>
----- Forwarded message from John A. Limpert -----
Date: Thu, 07 Oct 1999 02:00:34 -0400
From: "John A. Limpert" <johnl@radix.net>
Subject: CDR: Re: Unplugged! The biggest hack in history
A simpler method would be to install a bidirectional delay line. This would
allow you to preview the data at the input to the delay line, evaluate it
and insert hits at the output of the delay line. A TDR (time domain
reflectometer) would see a unusually long line between the subscriber and
the central office.
----- End of forwarded message from John A. Limpert -----
Two problems with this that would tip the tap off...
1. The TDR would not only see an increase in the propogation delay
but it'd show the two physical connections. A standard TDR will
show you if the wire's been kinked, a couple of hard physical
connections will show up as bumps or changes in the propogation
rate.
2. The extra delay will effect the echo-cancellation.
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