From: "James A. Donald" <jamesd@echeque.com>
Date: Sat, 15 Jul 95 17:29:04 PDT
To: hoz@univel.telescan.com (rick hoselton)
Subject: Re: def'n of "computer network"
Message-ID: <199507160028.RAA08597@blob.best.net>
MIME-Version: 1.0
Content-Type: text/plain



rick hoselton writes:
>> Perry, I don't understand.  If the least significant bits in my gif file
>> follow all the "known statistical distributions", how can anyone know 
>> whether they are "just noise" or are an encrypted message,

Perry E. Metzger wrote:
> Indeed -- how could the recipient even know to look,

Assume we have good public key steganography tools (I am not
aware of such tools.)

The recipient would have to scan a large pile of random 
pictures in the hope that some of the messages, when 
decoded using his private key, decoded into a correctly
formatted message.

Although prearrangement is needed, otherwise he would not 
be scanning this pile of random graphics for secret messages, 
he does not know whether he will receive a message or not, 
and no one else can know if he has received a message or not.

For example:

  "I have plutonium and bondage pictures of nine year old girls
   for sale"   My public key is 7uL623uvGjg8N-u7hO789HcysFhGyvcAgyh
   Interested parties should post replies stegoed into images
   posted on 
   alt.binaries.pictures.erotica.blondes.dinosaurs.oral.fetish.waifs

   Please use only new dirty pictures to hide your message in --
   not images I have already seen.
  "

Then people can post replies without anyone knowing they are
posting encrypted messages.
--
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We have the right to defend ourselves	|  http://www.jim.com/jamesd/
and our property, because of the kind	|
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derives from this right, not from the	|
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