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:
Nov. 03, 2015
Filed:
Oct. 09, 2013
Microsoft Corporation, Redmond, WA (US);
Bryan Born, Snohomish, WA (US);
Microsoft Technology Licensing, LLC, Redmond, WA (US);
Abstract
A cryptographic process is provided which allows a server to verify that a client device is genuine. The client device is provisioned with first and second data elements and a key which can be stored in fuses at the time of manufacture. When the client device requests digital content such as multimedia from the server, the server issues a genuineness challenge to the client device. The genuineness challenge is a message which includes a message authentication code (MAC) derived from a secret key of the server, in addition to an encrypted timestamp nonce. The client device prepares a response which includes a MAC derived from the client's key and the genuineness challenge. The response also includes the first and second data elements but not the client's key. The server processes the response to confirm that the client device is genuine.