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A security hack hidden in plain sight.
If you have a bank note handy, take close look at it. On many notes in many countries you’ll find a particular pattern of dots, something like this, repeated many times:
o o
o
o
o
On some notes they’re disguised: one on UK bank note they’re musical notes, although the music doesn’t make sense. On others they are zeros mixed in with other digits.
The pattern has a very specific purpose: it’s very quick to automatically detect, and it says “I am a bank note”. Various pieces of hardware and software look for it, and will refuse to copy the image if it’s found.
So far today, 2024-05-13, no feedback has been received.
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