AUTHENTICATION OF DETACHABLE PERIPHERAL DEVICES

摘要

A system and method for enabling an electronic appliance to verify the authenticity of a detachable peripheral device before that peripheral device is used by measuring a controlled impedance of a common wire and returning a proportional value, wherein the host may change or modulate the impedance of the wire before or during each measurement that the peripheral device makes, and if the peripheral device's reported answer matches the expected answer of the host, then the host device may allow the peripheral device to function properly.

主权项

1. A method for enabling an electronic appliance to verify the authenticity of a detachable peripheral device before that peripheral device is used, said method comprising:
providing a host device having a host custom integrated circuit, a peripheral device having a peripheral custom integrated circuit, and a communication link disposed so as to enable communication between the host custom integrated circuit and the peripheral custom integrated circuit; toggling the controlled impedance wire through a variable capacitor network within the host custom integrated circuit, wherein the toggling is synchronous with the peripheral custom integrated circuit; making an impedance measurement of the communication link.