The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 2025
Filed:
Jan. 13, 2021
Microsoft Technology Licensing, Llc, Redmond, WA (US);
Kapil Vaswani, Cambridge, GB;
CĂ©dric Alain Marie Fournet, Cambridge, GB;
Stavros Volos, Cambridge, GB;
Microsoft Technology Licensing, LLC., Redmond, WA (US);
Abstract
In various examples, there is a method of enabling an attestable update of a firmware layer that provides a unique identity of a computing device. An immutable firmware layer is used to access a unique device secret. The immutable layer is used to derive a hardware device identity (HDI) from the unique device secret. The immutable layer is used to derive a compound device identity (CDI) from a measurement of the firmware layer and the unique device secret. The CDI and HDI are made available to the firmware layer. The firmware layer is used to issue a local certificate to endorse a device identity key, derived from the CDI, the local certificate signed by a key derived from the HDI.