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From: kludge@gitpyr.UUCP
Newsgroups: net.crypt
Subject: Re: Dialback (Re: Re: foiling password crackers)
Message-ID: <1536@gitpyr.UUCP>
Date: Wed, 12-Mar-86 16:45:44 EST
Article-I.D.: gitpyr.1536
Posted: Wed Mar 12 16:45:44 1986
Date-Received: Fri, 14-Mar-86 00:17:49 EST
References: <974@decwrl.DEC.COM> <262@birtch.UUCP> <210@duts.UUCP> <2904@sunybcs.UUCP> <2724@reed.UUCP>
Reply-To: kludge@gitpyr.UUCP (Scott Dorsey)
Distribution: na
Organization: Georgia College Of Universal Knowledge
Lines: 36
Keywords: dialback security

>> I hear IBM's mainframe has a fool-proof way of dealing with hackers.
>> The computer stores each users phone number in memory. When the user
>> calls in and completes the login correctly, the mainframe hangs up
>> and calls the user back. This way the hacker would have to be at the
>> users house to do any hacking!

   These devices do take some time to break into.  First of all, a hacker 
has to obtain a valid access code.  Having done that, he calls up the
port, gives the access code, then calls the machine back on the line 
which is used by the machine to dialout (often the same line used to
dialin).  The machine gets a carrier and connects.  We had one of these
devices at work, and I would often do this while I was on the road and 
away from my home phone (which the machine knew about).
-------
Disclaimer: Everything I say is probably a trademark of someone.  But
            don't worry, I probably don't know what I'm talking about.

Scott Dorsey
Kaptain_kludge
ICS Programming Lab (Where old terminals go to die), Rich 110,
Georgia Institute of Technology, Atlanta, Georgia 30332
...!{akgua,allegra,amd,hplabs,ihnp4,seismo,ut-ngp}!gatech!gitpyr!kludge

USnail:  Box 36681, Atlanta GA. 30332
-- 
-------
Disclaimer: Everything I say is probably a trademark of someone.  But
            don't worry, I probably don't know what I'm talking about.

Scott Dorsey
Kaptain_kludge
ICS Programming Lab (Where old terminals go to die), Rich 110,
Georgia Institute of Technology, Atlanta, Georgia 30332
...!{akgua,allegra,amd,hplabs,ihnp4,seismo,ut-ngp}!gatech!gitpyr!kludge

USnail:  Box 36681, Atlanta GA. 30332