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. 18, 2025
Filed:
Dec. 05, 2023
Nxp B.v., Eindhoven, NL;
Ventzislav Nikov, Haasrode, BE;
Martin Heinrich Butkus, Hamburg, DE;
NXP B.V., Eindhoven, NL;
Abstract
A protection circuit for a Sbox, including: a first check circuit configured to determine if a most significant bit (MSB) part input into a first multiplier of the Sbox is zero; a second check circuit configured to determine if a CCn value input into the first multiplier and a second multiplier of the Sbox is zero; a third check circuit configured to determine if a least significant bit (LSB) part input into a first multiplier of the Sbox is zero; and a first Statistical Ineffective Fault Analysis (SIFA) logic circuit configured to produce a first output to indicate a SIFA attack when one of the following conditions is satisfied: both the MSB part and the LSB part are zero and the CCn value is not zero: or the CCn value is zero and either of the MSB part and LSB part are not zero.