CAD Stego (fwd)

Forwarded message:

Date: Sun, 18 Jan 1998 19:31:38 -0500 From: John Young 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 | |____________________________________________________________________|