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:
Apr. 24, 2007
Filed:
Oct. 31, 2005
Kenji Ohkuma, Yokohama, JP;
Hirofumi Muratani, Kawasaki, JP;
Shinichi Kawamura, Kodaira, JP;
Fumihiko Sano, Fuchu, JP;
Kenji Ohkuma, Yokohama, JP;
Hirofumi Muratani, Kawasaki, JP;
Shinichi Kawamura, Kodaira, JP;
Fumihiko Sano, Fuchu, JP;
Kabushiki Kaisha Toshiba, Kawasaki-shi, JP;
Abstract
An encryption apparatus for block data, comprises a first processing unit randomizing the block data in units of first portions obtained by dividing the block data, and a second processing unit diffusing the block data output from the first processing unit with respect to a second portion of the block data which is wider than the first portion. The first processing unit comprises first nonlinear processing units nonlinearly transforming the block data in units of the first portions. The second processing unit comprises a first linear diffusion processing unit linearly diffusing the second portion of the block data. At least one of the first nonlinear processing units comprises second nonlinear processing units nonlinearly transforming the block data in units of the first portions, and a second linear diffusion processing unit linearly diffusing the second portion of the block data.