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Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!cs.utexas.edu!oakhill!dover!darla!waters
From: waters@darla.sps.mot.com (Strawberry Jammer)
Newsgroups: misc.consumers,misc.misc,sci.misc,sci.electronics
Subject: Re: Telephone privacy gadgets
Keywords: Telephone, wiretap, bug, countermeasures, etc.
Message-ID: <1917@dover.sps.mot.com>
Date: 23 Oct 89 17:51:36 GMT
References: <799@mccall.uucp> <776@ariel.unm.edu> <397@hq.af.mil> <20247@mimsy.umd.edu>
Sender: news@dover.sps.mot.com
Reply-To: waters@darla.sps.mot.com (Strawberry Jammer)
Organization: Hacker's haven
Lines: 22

In article <20247@mimsy.umd.edu> marks@umiacs.umd.edu (Mark Schleifer) writes:
}
}   If a person who knows what they are doing puts a tap on your phone you
}won't be able to detect it.  If you are willing to spend some money your best
}bet is to buy a scrambler.  This will convert your message into a digital 
}format which is almost impossible to decode.  The only downside to this is 
}that both parties must have them but they make any bugs on your line useless.
}You can even get portable scrablers that work with car phones.  

The only problem with scramblers are that they they don't work! The problem
is that the actual number of codes is very limited (of course the dial may
have 10M or more codes, but most of them are duplicates!).

Audio scrambling using analog means is very easy to break as a result,
digital scrambling can be made extremly difficult but requires 3-4X the
bandwidth of the telephone line (2.5Khz Vs 16Khz). Not something you can use
from your home or office.

           *Mike Waters    AA4MW/7  waters@dover.sps.mot.com *
He who attacks the fundamentals of the American broadcasting industry
attacks democracy itself.
		-- William S. Paley, chairman of CBS