Great Circle Associates Firewalls
(October 1994)
 

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Subject: Re: CC & NIC
From: patrick @ oes . amdahl . com (Patrick Horgan)
Date: Tue, 25 Oct 1994 09:00:17 +0800
To: firewalls @ greatcircle . com

> CC is not just a pair of words - "Squeamish Ossifrage" has no meaning when
> placed out of context. On the other hand "Covert Channel" paints a mental 
> picture and helps *define* the problem: a mechanism for extraction of 
> information that is hidden. The term fits as nothing else in our lexicon,
> even some of the published definitions fit, so why not use it ?
> 
> 					Warmly,
> 						Padgett

Padgett, I've always agreed with everything else you posted, but this is just
plain mistaken.  A covert channel is not a mechanism from extraction of 
information that is hidden, it's a hidden channel for extraction of information
whether hidden or not.  It's the channel that's covert, not the information.

Patrick

     These opinions are mine, and not Amdahl's (except by coincidence;).

    ~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~  
  /                        |                           | (\               \
 |  Patrick J. Horgan      |  Amdahl Corporation       |  \\    Have       |
 |  patrick @
 oes .
 amdahl .
 com |  1250 East Arques Avenue  |   \\  _ Sword     |
 |  Phone : (408)992-2779  |  P.O. Box 3470 M/S 316    |    \\/    Will    |
 |  FAX   : (408)773-0833  |  Sunnyvale, CA 94088-3470 |   _/\\     Travel |
  \                        |  O16-2294                 |      \)          /
   ~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~


----- End Included Message -----


     These opinions are mine, and not Amdahl's (except by coincidence;).

    ~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~  
  /                        |                           | (\               \
 |  Patrick J. Horgan      |  Amdahl Corporation       |  \\    Have       |
 |  patrick @
 oes .
 amdahl .
 com |  1250 East Arques Avenue  |   \\  _ Sword     |
 |  Phone : (408)992-2779  |  P.O. Box 3470 M/S 316    |    \\/    Will    |
 |  FAX   : (408)773-0833  |  Sunnyvale, CA 94088-3470 |   _/\\     Travel |
  \                        |  O16-2294                 |      \)          /
   ~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~

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