Tuesday, October 18, 2005

Never trust a printer

Geek-blackmailers should better leave their modern gear and switch back to the old-fashioned technique, involving press cutting, scissors and glue.
The EEF (Electronic Frontier Foundation) discovered - and broke - a code hidden in documents by some laser printers on the market. The code, consisting in a series of microscopic yellow dots repeated in each page of the document, reveals the date/time of the print, along with the serial number of the printer itself.
Now, don't stare at those prints on your desk like a fool: in order to see the dots you'll need a blue light, a magnifier, or a microscope.
Just in case, on the EEF page there's a guide on how to see and read the dots and a program for automated decodings.

(via Boingboing)

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