Patent ID: 9306743
Filing Date: 2016-04-05
CPC Classification: B60R,G06F,G07C,H04L

Claim Text:
1. A one way paired key fob device, comprising: a transmitter configured to transmit signals to a control unit but not receive signals from the control unit; a memory configured to store a key fob counter and an operation key (OpKey); and a processor coupled to said transmitter and memory, the processor configured to: generate an AES-128 OpKey-encrypted value of the key fob counter; transmit a message comprising a predetermined number of lowest-order bits of the key fob counter and a predetermined number of bits of the AES-128 OpKey-encrypted value of the key fob counter to the control unit; and transmitting to the control unit a command to enter a revocation procedure, wherein OpKeys stored in the control unit that were not recorded during a period are deleted.