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:
Jan. 21, 2014
Filed:
Sep. 28, 2010
Jun Yajima, Kawasaki, JP;
Jun Yajima, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
This cryptographic apparatus executes calculations according to an FI function including a first non-linear function Sand a second non-linear function S, and includes a ROM recording a first table including, for each input X of 9 bits, a value obtained by exclusively ORing a first value and an first output from the function Swith respect to the input X, wherein the first value is generated by shifting lower 7 bits in the first output to left by 9 bits, and a second table including, for each input Y of 7 bits, a value obtained by exclusively ORing a second value and the input Y, wherein the second value is generated by shifting a result of an exclusive OR of the input Y and a second output from the function Swith respect to the input Y to left by 9 bits.