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:
Dec. 29, 2009
Filed:
Dec. 16, 2005
Tetsuya Izu, Kawasaki, JP;
Kouichi Itoh, Kawasaki, JP;
Masahiko Takenaka, Kawasaki, JP;
Naoya Torii, Kawasaki, JP;
Tetsuya Izu, Kawasaki, JP;
Kouichi Itoh, Kawasaki, JP;
Masahiko Takenaka, Kawasaki, JP;
Naoya Torii, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An elliptic curve cryptosystem apparatus performing an elliptic curve cryptosystem process has a coordinate transforming unit for transforming coordinates (X:Y:Z) on a point P on an elliptic curve over a finite field GF(p^m) to coordinates (r×(X−s):r×(Y−s):r×(Z−s)) (where, p is a prime number, m is an integer not less than 1, r, rand rare integers not less than 1 and not larger than (p−1), s, sand sare integer not less than 0 and not larger than (p−1), and a code '^' represents power), and a scalar multiplication operating unit for performing scalar multiplication on the point on the elliptic curve transformed by the coordinate transforming unit, wherein at least one of the parameters s, sand shas a value other than 0. The apparatus can perform the scalar multiplication in the elliptic curve cryptosystem, with resistance to side channel attacks.