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Tuesday, November 08, 2005
From the "Fascinating Read" department...
Is Your Printer Spying on You?
The Electronic Frontier Foundation is an organization that works to protect your digital rights. The EFF continues to champion the public interest in cutting-edge issues of free speech, privacy, innovation, and consumer rights. About a year ago it was revealed that several printer companies were quietly encoding the serial number and manufacturing code of their color laser printers and color copiers on every document those machines produce, ostensibly to combat counterfeiting. The codes are invisible to the naked eye, but with the help of a blue LED and a microscope you can see the yellow dots on the page.
The EFF set about to try to decode those dots and discovered how to read the date, time, and printer serial number from the codes. There are pictures of the codes and their analysis at: