US Patent:
20210158639, May 27, 2021
Inventors:
- Dearborn MI, US
Lisa Therese Boran - Northville MI, US
Daniel Aaron Zajac - Carleton MI, US
Aldi Caushi - Northville MI, US
Jochen Schubert - Royal Oak MI, US
Assignee:
Ford Global Technologies, LLC - Dearborn MI
International Classification:
G07C 9/00
H04L 9/32
H04L 9/30
G06F 12/0891
G06F 1/3206
G06F 1/3296
H04W 4/029
H04W 4/80
Abstract:
A Phone-as-a-Key (PaaK) system includes a pre-processor, a secure processor disposed in communication with the pre-processor, a cache memory associated with the pre-processor and the secure processor, and a memory for storing executable instructions. The pre-processor and the secured processor are configured to perform steps that can mitigate delay caused by mobile device authentication. For example, the pre-processor authenticates an authentication message associated with a mobile device used as a key for the vehicle, and stores the message in the cache memory. The pre-processor receives a door latch actuation signal, and initializes the secure processor in response. The pre-processor then provides access to the vehicle based on the secure processor initialization instruction, and the authentication message stored in the cache memory. After initialization, the secure processor sends a challenge value for second authorization of the mobile device, and triggers remedial actions if the device fails to respond correctly.