US 12,088,578 B2
Cryptographically protected provision of a digital certificate
Hendrik Brockhaus, Unterbiberg (DE); and Jens-Uwe Bußer, Neubiberg (DE)
Assigned to Siemens Aktiengesellschaft, Munich (DE)
Appl. No. 17/601,829
Filed by Siemens Aktiengesellschaft, Munich (DE)
PCT Filed Mar. 25, 2020, PCT No. PCT/EP2020/058249
§ 371(c)(1), (2) Date Oct. 6, 2021,
PCT Pub. No. WO2020/212101, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 19169200 (EP), filed on Apr. 15, 2019.
Prior Publication US 2022/0191191 A1, Jun. 16, 2022
Int. Cl. H04L 9/40 (2022.01)
CPC H04L 63/0823 (2013.01) [H04L 63/0838 (2013.01); H04L 63/0876 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for the cryptographically protected provision of a digital certificate for a device, comprising:
generating a one-time security identifier on the basis of a secret and at least one device-specific indication in a configuration apparatus,
transmitting the one-time security identifier to the device, and
in the device
generating security information on the basis of the one-time security identifier,
requesting the certificate from an issuing authority by way of a request message that contains the device-specific indication and that is cryptographically protected by way of the security information, and
in the issuing authority
checking the request message by way of the security information and the device-specific indication and the secret that is also known to the issuing authority, and
transmitting the certificate to the device in the event of a positive check result.