wait, I think I have it! you could stretch and swirl the picture in a fractal pattern, leaving Waldo distorted but still verifiable as waldo and then show it to your friend.
you would leave the four corners or some pre-agreed-upon locations intact, but the rest of the picture would be too distorted to give your friend any real help.. I guess the only issue here is making sure someone doesnt digitally insert a copy of Waldo... .. is it possible to distort the image using a hash who's key would be known by all parties before the exercise? (i.e.: center on Waldo, then run the warping algorithm which would leave the center intact, ) just an idea -JP _______________________________________________ Fun and Misc security discussion for OT posts. https://linuxbox.org/cgi-bin/mailman/listinfo/funsec Note: funsec is a public and open mailing list.
