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:
Mar. 09, 2021
Filed:
Apr. 25, 2018
Nxp B.v., Eindhoven, NL;
Sören Heisrath, Kaltenkirchen, DE;
NXP B.V., Eindhoven, NL;
Abstract
A method is provided for securely activating or deactivating functionality in a data processing system. The method includes determining to activate or deactivate a selected functional block of a plurality of functional blocks in the data processing system. An authentication key and a unique identifier are provided to a key derivation function of a function control circuit to produce a derived key value. The key derivation function is iteratively input with a sequence of function set identifiers, where each function set identifier is for identifying one or more of the functional blocks. Each function set identifier is paired with a previously derived key value from a previous iteration. A final iteration of the key derivation function provides a verification key for verifying the authenticity of the derived key value corresponding to the selected functional block to be activated or deactivated.