[EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] wrote:
This can be interesting: http://science.slashdot.org/science/05/03/01/2340238.shtml
Bearophile
Hey, that DataGlyph demo works pretty neat.
...
Of course, being an old System Test Engineer whose job it was to figure out how to break software, I couldn't let this challenge go unanswered.
So, picking up the gauntlet, I broke it in 5 seconds.
...
Naturally, the real answer is none of the above.
And the damage can be undone in 5 seconds also.
And, under the right circumstances, an undamaged DataGlyph could suffer the same fate (which also implies that the damaged DataGlyph could be read under the same circumstances).
ObPuzzle: how did I "damage" the image?
You created a mirror image.
The system can be made resistant to that problem by only allowing palindromic messages to be encoded, such as "Madam I am Adam.", 'Able was I ere I saw Elba." and "Named under a ban, a bared nude man."
Seriously, I am surprised that the Xerox demo does not try flipping the image around various axes. It would be trivial to add these transformations. Well, trivial to flip images along a few, obvious axes, but not along every possible axis.
What I want to know is whether any open source implementations of this technology are available. No doubt it is patented to death by Xerox.
Tim C
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