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Date: Sun, 18 Jan 1998 19:31:38 -0500 From: John Young <jya@pipeline.com> Subject: CAD Stego
This repeats a suggestion from 1994 about using computer assisted design programs to conceal text or other data:
3. The scale feature is useful to reduce, say, a text of any length, or any digital object, to the size of a pixel.
Assuming your color palate is deep enough to support the compression.
4. Or, the text can be distorted by scale and dimension to appear to be a line serving another function.
Don't you think they are going to wonder why *that* line is so varied in color? Or assuming deep color pallettes, why so many colors are selected when only a few dozen are actualy used in the drawing?
Then the message could be distorted or hidden as described above, for piggy-backing on an innocent- looking document issued,
I suspect they'll wonder why that particular file is so much larger than the other graphics files with the same number of layers.
7. Big shortcoming: how to securely transmit the location (virtual coordinates) of the hidden message and what
Look for the pixel that has the unique color mapped onto it.
8. Medium shortcoming: Full-featured CAD programs are expensive, however, the popular lite versions are cheap and can usually read the pricier output.
And can't handle more than a few dozen colors and limited layering. This suggestion is unworkable in application. ____________________________________________________________________ | | | The most powerful passion in life is not love or hate, | | but the desire to edit somebody elses words. | | | | Sign in Ed Barsis' office | | | | _____ The Armadillo Group | | ,::////;::-. Austin, Tx. USA | | /:'///// ``::>/|/ http://www.ssz.com/ | | .', |||| `/( e\ | | -====~~mm-'`-```-mm --'- Jim Choate | | ravage@ssz.com | | 512-451-7087 | |____________________________________________________________________|
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Jim Choate