| http://www.w3.org/ns/prov#value | - A method of operating a circuit, the method including the steps of:programming a token counter; programming a serial number; deriving a secret key from the serial number and storing the secret key; submitting a challenge and a command to the circuit; the circuit responding to the challenge in a secret manner using at least one of the following:the token counter; the secret key; an encoding algorit
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