Path: utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!usc!apple!vsi1!indetech!pacbell!ptsfa!dmt
From: dmt@PacBell.COM (Dave Turner)
Newsgroups: sci.electronics
Subject: Re: Wanted: caller ID specs/plans/etc...
Message-ID: <5317@ptsfa.PacBell.COM>
Date: 2 Jul 90 19:24:13 GMT
References: <6766@umd5.umd.edu> <14669@ucsd.Edu> <1990Jun29.130847.25026@bpdsun1.uucp>
Reply-To: dmt@PacBell.COM (Dave Turner)
Distribution: na
Organization: Pacific * Bell, San Ramon, CA
Lines: 21

In article <1990Jun29.130847.25026@bpdsun1.uucp> rmf@bpdsun1.UUCP (Rob Finley) writes:
..I'm waiting until Telebit or one of the other advanced modem
..manufacturers offers this in their standard product - i.e., the modem
..loads a string register with the contents of the CLID on an incoming
..call.
.
.If this were to take place, it would work even better than dialback security 
.for sensitive computer services.  Is there a way to defeat this?  
.Doesn't seem too easy...

If you are really concerned about security you should not rely on either
CLID or dialback modems.

Call forwarding can defeat both of these schemes. The really good (bad?)
crackers know how to put call forwarding on an accepted number.

This is getting harder to do but IMHO relying on either will delude you
into thinking that you are safe.

-- 
Dave Turner	415/823-2001	{att,bellcore,sun,ames,decwrl}!pacbell!dmt