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From: piggott@bnl.UUCP (Christopher Piggott @ Brookhaven National Laboratory, Long Island, N.Y.)
Newsgroups: net.followup
Subject: Re: telcom security
Message-ID: <799@bnl.UUCP>
Date: Sun, 18-Nov-84 13:22:57 EST
Article-I.D.: bnl.799
Posted: Sun Nov 18 13:22:57 1984
Date-Received: Wed, 21-Nov-84 08:53:26 EST
References: <114@dlpco.UUCP>
Lines: 19

> What if you attach a high quality tape recorder to a person's telephone
> line that is attached to their computer at 300 or 1200 baud with any
> of the available modems.  If you played the recording back to your modem,
> wouldn't you be able to watch all of the incoming and outgoing activity?

I once did this, in order to record my oen sessions in real time.  I found that
when I "Played" the session back, my modem locked on to my own carrier, so that
I only saw what I typed.  My next trick was to use something called a "Para-
metric Equalizer", a device which could boost or cancel out specific frequencies.
I used this to lock on to the host carrier, and only record that, since all of
what I type would be echoed back by the remote host anyhow.

The whole project worked very well, except that I bought a new terminal that
did all of this automatically a month later....

							Christopher Piggott

piggott@bnl
..!decvax!philabs!sbcs!bnl!piggott