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Posted on February 27th, 2006 by Bob Hall in UncategorizedOne subject that has always interested me is cryptography, codes, and ciphers. Most modern techniques use computers and fantastically large prime numbers to create secure messages that can be communicated over insecure channels. One of the most interesting techniques that I read of several years ago was visual cryptography. There have been several papers written, and some trite examples shown, but no one has ever written some robust code and then shared it. I shared this with a programmer friend and he decided to run with it this weekend as a project. To decode the message, all you need to do is print out each “photo” (click on image to view full size), and hold them together and view them by holding in front of a bright light. You can spray the paper with Pam and it will become almost transparent. For maximum effect, you could print them on overhead transparency film. Those of you knowledgeable with layers can use your favorite editing tool to combine them.


In the time honored technique of desperate editors everywhere, if you are still reading, you have a chance to make a quick $10.00. If you are the first to leave a comment, (please don’t use the two word secret code in the post), and email me the code words as the subject, you win $10.00. I will pay this via paypal, or cash if you are known to me and we regularly see one another (my choice). Please leave a comment once-and-a-while.
