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. 04, 2007
Filed:
Jun. 29, 2001
Kenji Ohkuma, Yokohama, JP;
Fumihiko Sano, Fuchu, JP;
Hirofumi Muratani, Kawasaki, JP;
Shinichi Kawamura, Kodaira, JP;
Kenji Ohkuma, Yokohama, JP;
Fumihiko Sano, Fuchu, JP;
Hirofumi Muratani, Kawasaki, JP;
Shinichi Kawamura, Kodaira, JP;
Kabushiki Kaisha Toshiba, Kawasaki-shi, JP;
Abstract
In each stage, multiple parallel nonlinear transformation modules each perform local lower-level diffusion, then a diffusion module performs higher-level diffusion over the block width and multiple parallel nonlinear transformation modules each perform local lower-level diffusion. This operation is repeated a predetermined number of times corresponding to the number of stages. Each nonlinear transformation module is formed into the nested SPN structure by arranging alternately nonlinear transformation modules and a diffusion module. The diffusion module performs linear transformation for spreading the state of at least one bit in input data to the preceding nonlinear transformation modules to at least one bit in input data to the succeeding nonlinear transformation modules.