Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: utzoo!linus!philabs!cmcl2!seismo!brl-tgr!ron From: ron@brl-tgr.ARPA (Ron Natalie) Newsgroups: net.followup Subject: Re: telcom security Message-ID: <5724@brl-tgr.ARPA> Date: Sun, 11-Nov-84 18:48:36 EST Article-I.D.: brl-tgr.5724 Posted: Sun Nov 11 18:48:36 1984 Date-Received: Tue, 13-Nov-84 01:23:36 EST References: <114@dlpco.UUCP> Organization: Ballistic Research Lab Lines: 12 > 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? Wrong. You'd only get one way. Your average modem only listens in one direction at a time. If the user had a full duplex computer, you could watch the whole thing. Alternatively, you could use two modems, or play the tape twice on the modem, once in originate and once in answer mode. -Ron