From: Harvey Newstrom (mail@HarveyNewstrom.com)
Date: Thu Sep 20 2001 - 17:32:27 MDT
Smigrodzki, Rafal wrote,
> How about using high-level manipulation of the picture (before
compression)
> - e.g bending blades of grass, shifting the shape of clouds, done with a
> graphics program. Such modifications would not (if skillfully done)
produce
> statistical aberrations at the level where compression occurs. By
comparing
> the modified picture to an unmodified original (initially transmitted by a
> secure channel - a courier with CD-ROM) you could read the message,
according
> to some predefined rules.
This is actually good method. The only problem is the classic "key
distribution" problem. You must get the first good picture to your
recipient in some covert secure channel first. If you have a way to get
secure messages through already, you probably don't need to use the unsecure
channel. This would be a good method if you had one shot at a secure
channel, but thereafter wanted to use an unsecure channel.
-- Harvey Newstrom <http://HarveyNewstrom.com> <http://Newstaff.com>
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