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- From: chuck@chadal.Gwinnett.COM (Chuck Daley)
- Newsgroups: comp.dcom.modems
- Subject: Re: Tapping modem communications?
- Message-ID: <ywR6TB2w165w@chadal.Gwinnett.COM>
- Date: 13 Nov 92 03:37:21 GMT
- References: <1992Nov10.121534.3436@csdvax.csd.unsw.edu.au>
- Lines: 39
-
- 10u6579@csdvax.csd.unsw.edu.au writes:
-
- >
- > I am curious as to how easily a modem line could be tapped. I read on
- > sci.crypt that there are problems in tapping a fast modem with error
- > correction.
- > Apparently it is no problem to tap a 300-2400baud modem. I read that
- > it is possible to tape record the phone line and then play the tones back int
- > a modem, is this really possible??
- >
- > I would really appreciate any thoughts/ comments etc.
- > Best Wishes,
- > Henry.
-
- Yes, it can be done. I haven't personally recorded something and
- recreated it later but I am familiar with some people who have. If the
- signal is going to be recorded, the better quality the recorded signal
- the greater likelihood that the output will be useful.
-
- At work I have had need to use devices that can decode the analog output
- between two modems as the modems were chip based and there was no other
- way to monitor them. This usually requires two modems to get both sides
- of the data transfer. So far this has always been at the lower speeds.
- It stands to reason that when the higher speed modems get into MNP or
- V.42 mode that they might be difficult to monitor. I seem to recall that
- these modes are usually the result of some form of negotiation and a
- monitoring modem that was not party to such negotiation probably wouldn't
- set up correctly.
-
- That's my $0.03 worth.
-
- Chuck
-
- *******************************************************************************
-
- Chuck Daley KD4LXQ Internet: Chuck@CHADAL.GWINNETT.COM
- 10565 Willow Meadow Circle Compuserve: 73457,3114
- Alpharetta, GA 30202 Genie C.DALEY.1
- *******************************************************************************
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