Apparatus for validating the presence of an authorized accessory
AssigneeSilverbrook Research Pty Ltd
InventorKia Silverbrook
Life of this patent
Estimating the term…
Abstract
An apparatus for validating the presence of an authorized accessory of the apparatus includes an integrated circuit which stores a secret key K, is configured to define a random number generator which returns R and is configured to apply a function F[R] to return FK[R], based on the secret key K. The apparatus includes a control system which is configured to request FK[R] from the integrated circuit and from a further integrated circuit positioned on the accessory and to compare FK[R] from both the integrated circuits.
Claims6
An apparatus for validating the presence of an authorized accessory of a device, the apparatus comprising
- an integrated circuit which stores a secret key K1 is configured to define a random number generator which returns R and is configured to apply a function F[R] to return FK[R], based on the secret key K;
- and
- a control system which is configured to request FK[R] from the integrated circuit and from a further integrated circuit positioned on the accessory and to compare FK[R] from both the integrated circuits.
A method of validating the presence of an authorized accessory of a device, the method comprising the steps of:
- storing a secret key, K, in an integrated circuit of the device and in an integrated circuit of the accessory;
- generating a random number R with the integrated circuits;
- applying a function F[R] to R using K at each integrated circuit to return FK[R] at each integrated circuit;
- requesting FK[R] from both integrated circuits;
- and
- comparing FK[R] from both integrated circuits.
Dependencies are inferred from the claim text.