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:
Jun. 09, 2026
Filed:
Jun. 26, 2024
GM Global Technology Operations Llc, Detroit, MI (US);
Mohamed A. Layouni, Fraser, MI (US);
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Abstract
A method for updating arbitrary length cryptographic keys having a bit length greater than 256 bits by a cryptographic key update system includes transmitting, by a sender, a first transmission to one or more controllers that are part of a vehicle and transmitting, by the sender, a second transmission to the one or more controllers, where the second transmission is a symmetric key encryption under a key encryption key of a concatenation of a plurality of parameters and a new cryptographic key. The sender derives the key encryption key by transforming an authentication key and a bit string of constant values based on an N-bit compression function. The method includes transmitting, by the sender, a third transmission to the one or more controllers that is an N-bit message authentication code under a first message authentication code (MAC) key of a concatenation of the first transmission and the second transmission.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile