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Article #1326

Re: Electronic sweeping and debugging equiptments

#1326
From: David A. Honig
Date: Sun, 27 Aug 1989 17:00
38 lines
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In article <6660@stiatl.UUCP> john@stiatl.UUCP (John DeArmond) writes:
>In article <CMM.0.88.620075522.yj1@cunixa.cc.columbia.edu> yj1@CUNIXA.CC.COLUMBIA.EDU (y) writes:
>>
>>Do you know any equiptment that can check whether the phone lines are
>>monitored or the rooms are bugged?  Do you know any anti-spy techniques
>>in general?
>
>This CANNOT be done with sufficient reliability to bet your life on.
>Especially when the adversary is the government that has control of the
>switching equipment.  Some equipment will detect direct-connect bugs.
>Most will not detect inductive or capacitive coupled taps.  And none
>will detect taps initiated at the CO.  Even scrambling won't work in
>that environment.  The existance of a scrambled signal would be more
>than enough excuse for arrest.  

This won't work for speech but for letters and radio (and is amenable
to machine translation),

If you use a method of coding your messages where:
 You use ordinary phrases to mean other things,  
 And you use a shared, trusted codebook ( translation lookup-table),
Then you could use unsecure channels to communicate securely.

However, make sure you change codebooks frequently enough so that if
someone knew approximately what you meant, for some period of time,
and recorded your ciphertext, they could not understand your coding.

If done right, this will not attract the attention that a scrambled or
otherwise coded signal would.

>Your friends wll have to learn the same lessons learned by dissitants 
>elsewhere.  
>
>John

David
--
David A Honig
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!apple!usc!orion.cf.uci.edu!uci-ics!honig
From: honig@ics.uci.edu (David A. Honig)
Newsgroups: sci.electronics
Subject: Re: Electronic sweeping and debugging equiptments
Message-ID: <21722@paris.ics.uci.edu>
Date: 27 Aug 89 17:00:43 GMT
References: <CMM.0.88.620075522.yj1@cunixa.cc.columbia.edu> <6660@stiatl.UUCP>
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Organization: University of California, Irvine - Dept of ICS
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