![How tech sleuths cracked the mysterious code that turns your printer into a spying tool - The Washington Post How tech sleuths cracked the mysterious code that turns your printer into a spying tool - The Washington Post](http://www.washingtonpost.com/news/morning-mix/wp-content/uploads/sites/21/2017/06/dot-pattern-eff.jpg)
How tech sleuths cracked the mysterious code that turns your printer into a spying tool - The Washington Post
![Secret yellow dots that every color printer uses to help the government track what you print (xpost r/extremecloseups) : r/cringepics Secret yellow dots that every color printer uses to help the government track what you print (xpost r/extremecloseups) : r/cringepics](https://external-preview.redd.it/buJUJ-xMufqhzwInscuUuUhUHBmzmdeUSJ5DkLj6dT4.jpg?auto=webp&s=996a2f52f7008cc9a9b72e312ef47d00b31e460f)
Secret yellow dots that every color printer uses to help the government track what you print (xpost r/extremecloseups) : r/cringepics
![Reality Winner was outed by invisible dot patterns added by printers (among other things) | Boing Boing Reality Winner was outed by invisible dot patterns added by printers (among other things) | Boing Boing](https://i0.wp.com/boingboing.net/wp-content/uploads/2017/06/Screenshot-2017-06-05-21.50.07.png?fit=684%2C523&ssl=1)
Reality Winner was outed by invisible dot patterns added by printers (among other things) | Boing Boing
Greg on Twitter: "Printed medium is pretty cool under the microscope. The yellow dots in the area around the printer are likely part of a machine identification code the printer adds. https://t.co/bZ7tt88WvN" /
![Investigating Machine Identification Code Technology in Color Laser Printers | Electronic Frontier Foundation Investigating Machine Identification Code Technology in Color Laser Printers | Electronic Frontier Foundation](https://www.eff.org/files/xerox_doc12_test07_checkerboard.jpg)
Investigating Machine Identification Code Technology in Color Laser Printers | Electronic Frontier Foundation
![Yellow dots identify printers: Computer scientists of TU Dresden develop a tool for printer anonymisation — Chair of Privacy and Data Security — TU Dresden Yellow dots identify printers: Computer scientists of TU Dresden develop a tool for printer anonymisation — Chair of Privacy and Data Security — TU Dresden](https://tu-dresden.de/ing/informatik/sya/ps/ressourcen/bilder/news/ff9eaada-70dc-4368-a088-6c1348b901ce.jpeg/@@images/6c11c98c-7cbc-4a22-923e-8a44563b9daf.jpeg)