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. 02, 2007
Filed:
Sep. 10, 2003
Koichi Fujisaki, Chiba-ken, JP;
Atsushi Shimbo, Tokyo, JP;
Masahiko Motoyama, Kanagawa-ken, JP;
Hanae Ikeda, Kanagawa-ken, JP;
Yuuki Tomoeda, Kanagawa-ken, JP;
Koichi Fujisaki, Chiba-ken, JP;
Atsushi Shimbo, Tokyo, JP;
Masahiko Motoyama, Kanagawa-ken, JP;
Hanae Ikeda, Kanagawa-ken, JP;
Yuuki Tomoeda, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An encryption apparatus provided with a Feistel type encryption algorithm includes a function operation unit that operates a non-linear function, and changing unit configured to supply the function operation unit with random data unrelated to an encryption operation result. In this way, a countermeasure can be taken against a DPA attack following the end of an operation by the encryption operation apparatus provided with the Feistel type encryption algorithm.