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. 07, 2023
Filed:
Dec. 19, 2019
Meta Platforms Technologies, Llc, Menlo Park, CA (US);
Sudhir Satpathy, Redmond, WA (US);
META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US);
Abstract
A system on a chip (SoC) includes a security processor configured to form a Boolean mask, to form a shifted-row Boolean mask from the Boolean mask, and to add the shifted-row Boolean mask to cipher text to form Boolean-masked cipher text. The SoC includes a decryption engine configured to apply a shift rows operation to the Boolean-masked cipher text to form byte-aligned Boolean-masked cipher text, to apply a product of the Boolean mask and a multiplicative mask to the byte-aligned Boolean-masked cipher text to form multiplicatively masked cipher text, to perform an inverse byte substitution operation on the multiplicatively masked cipher text by applying a product of the Boolean mask and an inverse of the multiplicative mask to the multiplicatively masked cipher text to form Boolean-masked intermediate data, and to apply mix columns logic to the Boolean-masked intermediate data to form byte-shifted Boolean-masked output data.