Patent ID: 9654975
Date: 2017-05-16
CPC Classifications: H04W

Claim:
1. A method for authenticating a mobile device, comprising: probing, by the mobile device, a fading channel which connects the mobile device to a first radio base station; determining, by the mobile device, a secret the mobile device has in common with the first radio base station by deriving the secret from a physical property of the fading channel assessed by the mobile device within a time window defined in common with the first radio base station, wherein derivation of the secret yields a bit sequence dependent on a position of the mobile device during the time window; storing, by the mobile device, the common secret; receiving, by the mobile device, a first request for the common secret from a second radio base station; and sending, by the mobile device, upon the first request, a proof of knowledge of the common secret to the second radio base station.