Patent ID: 9294287
Filing Date: 2016-03-22
CPC Classification: H04L,H04W

Claim Text:
1. A method for authenticating an accessory of a mobile device, the method comprising: receiving at a mobile device an authentication request from a mobile device accessory; selecting an initial challenge value at the mobile device in response to receiving the authentication request, the initial challenge value selected from a plurality of challenge values based on challenge-response distribution data stored on the mobile device, the challenge-response distribution data indicating selection probabilities for the plurality of challenge values; sending an interrogation message from the mobile device to the mobile device accessory, the interrogation message comprising the initial challenge value; modifying the challenge-response distribution data stored on the mobile device, wherein modifying the challenge-response distribution data increases the selection probability for the initial challenge value; selecting a subsequent challenge value from the plurality of challenge values based on the modified challenge-response distribution data; and sending a subsequent interrogation message from the mobile device to the mobile device accessory, the subsequent interrogation message comprising the subsequent challenge value.