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Oh Sweet Sithis! I'm back on my BullShit!!!

@cryblueofzamorak / cryblueofzamorak.tumblr.com

Multi Fandom RPing Dragon

it needs to print the unique identifier

They’re right! Microdots, AKA Machine Identification Code

If you have a color printer made in the last literal 30 years, it has this. Toner, ink, etc, doesn’t matter.

They encode the printer’s unique identifier, and often a date/time stamp, along with whatever else manufacturers put on there

There’s an overview from way back in 2006 by the Purdue Homeland Security Institute that talks about how manufacturers have also gone past “simple” microdots, and use things like embedding multiple colors (like cyan) in greyscale parts of the image, and using laser modulation on black and white documents on laser printers in a way that is machine-only readable for unique identification.

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p1sswallet

My printer is a snitch, apparently

wait so this is why in movies and TV the killer makes notes out of cut and pasted letters from magazines?? I thought they just liked crafts

why cant they just write tho

Handwritten notes can be compared with handwriting on other documents and lead to identification.

From wikipedia:

“The public first became aware of Machine Identification Code in October 2004, when it was used by Dutch authorities to track counterfeiters who had used a Canon color laser printer. In 2005, the civil rights group Electronic Frontier Foundation (EFF) encouraged the public to send in sample printouts and subsequently decoded the pattern. The EFF stated in 2015 that the documents that they previously received through the FOIA suggested that all major manufacturers of color laser printers entered a secret agreement with governments to ensure that the output of those printers is forensically traceable.

In 2018, scientists from TU Dresden developed and published a tool to extract and analyze the steganographic codes of a given color printer and subsequently to anonymize prints from that printer. The anonymization works by printing additional yellow dots on top of the Machine Identification Code. The scientists made the software available to support whistleblowers in their efforts to publicize grievances”

DEDA - tracking Dots Extraction, Decoding and Anonymisation toolkit

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