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:
Oct. 14, 2008
Filed:
Mar. 22, 2005
Yuichi Futa, Osaka, JP;
Masami Yamamichi, Legal Representative, Ota, JP;
Satomi Yamamichi, Legal Representative, Ota, JP;
Keiko Yamamichi, Legal Representative, Ota, JP;
Motoji Ohmori, Hirakata, JP;
Hiroyuki Shizuya, Sendai, JP;
Masahiro Mambo, Tsukuba, JP;
Yuichi Futa, Osaka, JP;
Masami Yamamichi, legal representative, Ota, JP;
Satomi Yamamichi, legal representative, Ota, JP;
Keiko Yamamichi, legal representative, Ota, JP;
Motoji Ohmori, Hirakata, JP;
Hiroyuki Shizuya, Sendai, JP;
Masahiro Mambo, Tsukuba, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A computer system that makes it difficult to analyze the content of a calculation. In the computer system, a power operation unit performs the following operations using the input data 'a' and 'b': g=gmod n, g=gmod n. Next, in the computer system, a multiplication unit performs the following calculation using gand g: g=g×gmod n. Next, in the computer system, a discrete logarithm calculation unit calculates cmod p−1 to satisfy g=gmod p(i=1, 2, 3, . . . , k). Next, in the computer system, a CRT unit calculates “c” to satisfy c=c mod p−1 (i=1, 2, 3, . . . , k) using the Chinese remainder theorem CRT.