I made the pictures with this Java program: http://www-i1.informatik.rwth-aachen.de/%7Ealgorithmus/Gimmicks/VisuelleKryptographie/vc.php (click "Java Programm zur Erzeugung von Folien") For more information look here: http://users.telenet.be/d.rijmenants/en/visualcrypto.htm Similar project: http://scratch.mit.edu/projects/goch/886480
