There is, but since color printers are the ones that were used in counterfeiting most black and white printers don't do that sort of thing. Plus I don't know how you'd encode that much information in black and white without making it visible on the paper.
jarfil@beehaw.org 7 months ago
You could encode information as slight “mistakes” in the print. An extra dot here, a missing dot there, some slight “printing error” in some place.
There could be ways, but as you said, it’s to combat money counterfeiting. Like the Euro constellation detection in scanners, PhotoShop, and printer drivers. (fun fact: it’s quite easy to bypass, not sure why they even bothered… it only stops people who put 0 thought into counterfeiting anyway)