US 12,143,512 B2
Cascaded key delegation system for sharing a digital key associated with a vehicle
Mohamed A. Layouni, Fraser, MI (US); Jinzhu Chen, Troy, MI (US); Fan Bai, Ann Arbor, MI (US); Ying Li, Duluth, GA (US); Manohar Nemilikonda, Cumming, GA (US); and Markus Jochim, Troy, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Jul. 1, 2022, as Appl. No. 17/810,393.
Prior Publication US 2024/0007306 A1, Jan. 4, 2024
Int. Cl. H04L 9/32 (2006.01); B60R 25/24 (2013.01)
CPC H04L 9/3268 (2013.01) [B60R 25/241 (2013.01); H04L 2209/80 (2013.01); H04L 2209/84 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for sharing a digital key associated with a vehicle by a cascaded key delegation system, the method comprising:
issuing, by a requestor device, a public key certificate to an initial delegator device that is part of a cloud delegation service, wherein the public key certificate enables the initial delegator device to grant delegation rights to the vehicle;
issuing, by the initial delegator device, an intermediate public key certificate to a subsequent delegator device that is part of the cloud delegation service, wherein the intermediate public key certificate grants the delegation rights to the subsequent delegator device, and the subsequent delegator device is a last delegator device of the cloud delegation service;
issuing, by the last delegator device, a leaf public key certificate to an end user device, wherein the leaf public key certificate indicates that the last delegator device endorses access rights to the vehicle; and
submitting, by the end user device to the requestor device, a request for access to the vehicle, wherein the request for access to the vehicle includes the leaf public key certificate, a request for access rights, and a certificate chain that is an ordered list of public key certificates that start with the public key certificate and end with the leaf public key certificate.