Method to authenticate an accessory

Details Method to authenticate an accessory Method to authenticate an accessory

2011-03-01

2011-03-01

Jung, David Y (Department: 2431)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S170000, C713S150000

Reexamination Certificate

active

07900045

ABSTRACT:
An apparatus (100) used by a plurality of devices to authenticate an accessory (120) is configured to operate with a device (110) of the plurality of devices. The accessory (120) applies an authentication algorithm to a key and a challenge (130) received from the device (110) and generates a response (132) thereto. A challenge and response memory (114) stores a subset of a set of challenges (232) and pre-computed responses (230). The enabling circuit transmits a challenge (130) to the accessory (120) and receives a received response (132) therefrom. The enabling circuit (112) also compares the received response (132) to the stored response (230) corresponding to the stored challenge (232) sent to the accessory (120). The enabling circuit (112) is configured to generate a normal operation enabling signal that enables normal operation of the device when the received response (132) matches the stored response and is configured not to generate the normal operation enabling signal when the received response (132) does not match the stored response.

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