arXiv:1010.0256quant-ph
An online attack against Wiesner's quantum money
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Abstract
Wiesner's quantum money [5] is a simple, information-theoretically secure quantum cryptographic protocol. In his protocol, a mint issues quantum bills and anyone can query the mint to authenticate a bill. If the mint returns bogus bills when it is asked to authenticate them, then the protocol can be broken in linear time.
> The conversion into a classical check bit sounds kind of trivial, since the bank has to do the verification of the check. Just add some EPR pairs to the token and use them for teleportation. The measurement results of the teleportation are the classical check. Be very, very…
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