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:
Apr. 27, 2021
Filed:
Mar. 19, 2018
Arm Limited, Cambridge, GB;
Yoav Asher Levy, Kfar-Saba, IL;
Arm Limited, Cambridge, GB;
Abstract
Data processing apparatuses and methods for performing an iterative determination of a key schedule are provided. A set of registers initially receives an input data item and data processing is then performed using the content of the set of registers as an input. The result of this data processing is then used to update a value stored in a predetermined register of the set of registers at each iterative round of the determination of the key schedule. Dependent on whether the data processing apparatus is in a reverse key expansion mode or a forwards key expansion mode determines which register in the set of registers is that predetermined register. Further, the set of registers is arranged to shift values contained in the set of registers in a direction which depends on whether the data processing apparatus is in a reverse key expansion mode or a forwards key expansion mode. The directions for the two modes are opposite to one another.