Path: utzoo!attcan!uunet!lll-winken!ames!killer!vector!nobody
From: visdc!jiii@uunet.UU.NET (John E Van Deusen III)
Newsgroups: comp.dcom.telecom
Subject: Re: For Callback Security Use a Different Line
Message-ID: <telecom-v09i0007m06@vector.UUCP>
Date: 7 Jan 89 00:28:09 GMT
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X-TELECOM-Digest: volume 9, issue 7, message 6

The problem of verifying that a penetrator is not hanging on the line
could be solved by first dialing your own system and doing some secret
handshaking.  This method does not require extra lines, (unless the
call mix is 100% call-back of incoming calls), or optional services.
Some programming is required, and the penetrator will see the login
sequence used to do the verification.  It would be, therefore, one of
those single-command logins with no password.