Honda autos use a key that is hard to counterfeit, but further impede duplication by embedding an RFID tag in the handle.
Now there are thumb drives that implement such an algorithm.
If used as a dongle, this drive could store a password protected boot key. If the dongle is "something you have," but the password is maintainable, and becomes "something you know," this would become a two-factor authentication tool, for security sensitive computing devices.
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