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:
Dec. 23, 2014
Filed:
Apr. 13, 2011
Timothy A. Lewis, El Dorado Hills, CA (US);
Timothy A. Lewis, El Dorado Hills, CA (US);
Phoenix Technologies Ltd., Campbell, CA (US);
Abstract
Techniques for determining whether firmware should trust an application sufficiently so as to provide a service to the application. Firmware, executing on a device, receives an indication that an application, also executing on the device, is requesting a service provided by the firmware. The firmware obtains (a) an operating system signature associated with the application and (b) a firmware signature associated with the application. The operating system signature is a signature that is used by the operating system, executing on the device, to authenticate the application, while the firmware signature is a signature that is used by the firmware to authenticate the application. If the firmware determines that the operating system signature matches the firmware signature, then the firmware storing trust data that permits the application to access the service provided by the firmware. The firmware need not calculate a signature based on the in-memory image of the application.