Patent ID: 8963687
Filing Date: 2015-02-24
Classification: G07B,H04L,H04W

Abstract:
1. A method for Dedicated Short-Range Communication (DSRC) communication between a plurality of beacons and one of a plurality of onboard units of a road toll system, the method comprising: providing the plurality of the beacons with a system-wide key; providing each of the plurality of the onboard units with a respective individual key formed from the system-wide key on the basis of a derivation code specific to a respective onboard unit, the system-wide key not being stored in the onboard units; upon a first communication from an onboard unit to a first beacon, transmitting the derivation code of said onboard unit to the first beacon to enable the first beacon to emulate the individual key of the onboard unit for encryption/decrypting said first communication with said onboard unit, or for accessing data stored in said onboard unit; upon a second communication from said onboard unit to a second beacon, varying the derivation code to obtain a second derivation code; and transmitting the second derivation code to the second beacon to enable the second beacon to emulate a second individual key for said onboard unit for encryption/decrypting said second communication with said onboard unit, or for accessing data stored in said onboard unit, wherein, as part of the first communication with said onboard unit, the first beacon transmits thereto at least one new individual key and associated derivation code pair, which the onboard unit uses in said second communication with said second beacon.