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Flag attempts with the old key to security (policy on whether access is granted and monitored or denied dependent on security required). Allow devices flagged for enhanced scrutiny to be cleared at an authorised/monitored point, at which point it would also update the card to have a new secret/keypair in addition to the old one. Flag devices whose previous contact transcripts don’t match for enhanced scrutiny. On a regular basis, authentication systems should exchange a token with a carried RFID device, and in subsequent interactions, the list of the last X tokens be returned to the authentication system, so the system knows if it’s the same device that’s been responding. The way burglary tools are defined, you could get in trouble with this in many states currently if they can prove intent to commit a crime.
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