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. 18, 2007
Filed:
Apr. 16, 2002
M. Jay Parks, Kirkland, WA (US);
Jonas Fredrik Helin, Järfälla, SE;
M. Jay Parks, Kirkland, WA (US);
Jonas Fredrik Helin, Järfälla, SE;
Microsoft Corporation, Redmond, WA (US);
Abstract
A device has a symmetric device key (DK) and a copy of (DK) encrypted according to a public key (PU) of an entity (PU(DK)). The device receives an object from a host computer, at least a portion of which is encrypted according to (DK). The device sends (PU(DK)) to the host computer, and the host computer sends (PU(DK)) to the entity. The entity applies a corresponding private key (PR) to (PU(DK)) to obtain (DK) and sends (DK) to the host computer. The host computer may then encrypt the object according to (DK) and download same to the device, and the device may decrypt the encrypted object based on (DK).