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:
Sep. 24, 2019
Filed:
Apr. 27, 2017
Microsoft Technology Licensing, Llc, Redmond, WA (US);
Dean Anthony Wells, Snohomish, WA (US);
Nir Ben-Zvi, Bellevue, WA (US);
Ryan P. Puffer, Bellevue, WA (US);
Microsoft Technology Licensing, LLC, Redmond, WA (US);
Abstract
A device runs a hypervisor and a virtual machine. The virtual machine includes a virtual security module, which can be a virtual trusted platform module (TPM). The virtual security module for the virtual machine is encrypted, and in order for the hypervisor to run the virtual machine the virtual security module is decrypted using a security module key. If a host guardian service is accessible, then the hypervisor obtains the key to decrypt the virtual security module from the host guardian service. However, if the host guardian service is inaccessible, then the hypervisor uses a key securely stored in a key cache of the device to decrypt the virtual security module. In one or more embodiments, the hypervisor can obtain the key from the key cache only if a health certificate indicating that the host guardian service trusts the device has been previously obtained from the host guardian service.