1993-11-08 - Tapping modem transmissions

Header Data

From: Matthew J Ghio <mg5n+@andrew.cmu.edu>
To: cypherpunks@toad.com
Message Hash: b4214e2dcf6549c633ceab436dd8f2f6c1176785ac395fa098a42c4689dae058
Message ID: <Ugrec5600awK8D9Uch@andrew.cmu.edu>
Reply To: <9311080705.AA15339@toad.com>
UTC Datetime: 1993-11-08 20:23:03 UTC
Raw Date: Mon, 8 Nov 93 12:23:03 PST

Raw message

From: Matthew J Ghio <mg5n+@andrew.cmu.edu>
Date: Mon, 8 Nov 93 12:23:03 PST
To: cypherpunks@toad.com
Subject: Tapping modem transmissions
In-Reply-To: <9311080705.AA15339@toad.com>
Message-ID: <Ugrec5600awK8D9Uch@andrew.cmu.edu>
MIME-Version: 1.0
Content-Type: text/plain


It's not too technically difficult to tap modem connections at low
speed, I played around with it a few years back, and I was able to add a
third modem onto a 300 or 1200 baud connection and view what was being
transmitted.  Using the modem as a dumb interpreter of the signal works
well to analyze the raw data being transmitted at low speeds, but when
you use v.42 and LAPM, things get a bit more complicated.  You need
special hardware/software to interpret and decode the compressed &
checksummed data packets.

Thread

• Return to November 1993

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• Return to “Brad Huntting <huntting@glarp.com>”
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• Return to “ferguson@icm1.icp.net (Paul Ferguson x2044)”
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• Return to “Mike Godwin <mnemonic@eff.org>”

• Return to “Timothy Newsham <newsham@wiliki.eng.hawaii.edu>”

• 1993-11-06 (Sat, 6 Nov 93 13:22:45 PST) - Mark Abene (Phiber Optik) sentenced - ferguson@icm1.icp.net (Paul Ferguson x2044)
  • 1993-11-07 (Sun, 7 Nov 93 07:03:11 PST) - Re: Mark Abene (Phiber Optik) sentenced - Mike Godwin <mnemonic@eff.org>
  • 1993-11-08 (Sun, 7 Nov 93 18:48:14 PST) - tapping hardware? (was re: Mark Abene (Phiber Optik) sentenced) - “Mark W. Eichin” <eichin@paycheck.cygnus.com>
    • 1993-11-08 (Sun, 7 Nov 93 21:08:14 PST) - Re: tapping hardware? (was re: Mark Abene (Phiber Optik) sentenced) - David Kovar <kovar@nda.com>
      • 1993-11-08 (Sun, 7 Nov 93 23:08:17 PST) - Re: tapping hardware? (was re: Mark Abene (Phiber Optik) sentenced) - Timothy Newsham <newsham@wiliki.eng.hawaii.edu>
        • 1993-11-08 (Mon, 8 Nov 93 11:48:23 PST) - Re: tapping hardware? (was re: Mark Abene (Phiber Optik) sentenced) - Brad Huntting <huntting@glarp.com>
        • 1993-11-08 (Mon, 8 Nov 93 12:23:03 PST) - Tapping modem transmissions - Matthew J Ghio <mg5n+@andrew.cmu.edu>
          • 1993-11-08 (Mon, 8 Nov 93 13:08:47 PST) - Re: Tapping modem transmissions - A1 ray arachelian (library) <rarachel@ishara.poly.edu>
    • 1993-11-08 (Mon, 8 Nov 93 02:13:36 PST) - Re: tapping hardware? (was re: Mark Abene (Phiber Optik) sentenced) - kelly@netcom.com (Kelly Goen)