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. 08, 2005
Filed:
Apr. 06, 2000
Natsume Matsuzaki, Monou, JP;
Yasuo Okumura, Moriguchi, JP;
Takatoshi Ono, Aichi-ken, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Abstract
A multi-word arithmetic device, capable of executing a variety of types of multi-word arithmetic required for elliptic curve cryptology, includes the following. A memory, formed from two dual-port memoriesand, temporarily stores n-word integers on which calculation is performed, and a calculation result. An arithmetic unitexecutes two or more types of calculation, including addition and multiplication, on each word, and outputs a one-word result. A memory input/output unitsupplies a maximum of three pieces of one-word data from the memoryto the arithmetic unit, while simultaneously storing a one-word calculation result from the arithmetic unitin the memory. A control unitcontrols the arithmetic unitand the memory input/output unitso as to have the arithmetic unit execute one of modular addition and Montgomery reduction on n words.