[EMAIL PROTECTED] wrote: > > It's time to start wearing t-shirts bearing the image of a > banned banknote. > (To circumvent counterfeiting laws, wear the banknote of a > foreign country). > Imagine the frustration of the police when they can't > photocopy your picture. >
>From the original article: "The software relies on features built into leading currencies. Latest banknotes contain a pattern of five tiny circles. On the �20 note, they're disguised as a musical notation, on the euro they appear in a constellation of stars; on the new $20 note, the pattern is hidden in the zeros of a background pattern. Imaging software or devices detect the pattern and refuse to deal with the image." It would be interesting to figure out exactly what the 'don't copy' information is. If it's really just five little circles, think of the fun you could have - - create a rubber stamp with the appropriate image, and stamp all kinds of documents. - sell a line of printer paper which can't be copied or scanned. - make web pages which can't be printed. - draw or tattoo it on your forehead, and suddenly no photo of you can be printed (or perhaps, even taken!). ahhhhhh - the law of unintended consequences. Peter Trei --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]
