Very cool! This seems almost like physical cryptography. Maybe there is a better term for it, but I’d be very interested in other work along these lines.
https://www.sciencedirect.com/journal/computer-networks/vol/...
> We describe the first MITM-resistant device pairing protocol purely based on a single wireless interface with an extensive adversarial model and protocol analysis. We show that existing wireless devices can be retro-fitted with the VP protocol via software updates, i.e. without changes to the hardware.
Examples (aha, including a teaser to an upcoming product called “Verifibre”!) can be seen here:
Instead of a lookup table, that number could be signed and the signature printed onto the bank note itself. It would be impractical to either deduce the signing key or duplicate the pattern of fibers in a way that the signature was still valid.
I don’t know if there’s a signature algorithm though that is resilient to lossy and unreliable input data and which can also produce short enough output that could be printed on the face of a bank note.