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:
Mar. 15, 2016
Filed:
Aug. 14, 2012
Tsukasa Endo, Tokyo, JP;
Yuichi Komano, Kanagawa, JP;
Koichi Fujisaki, Kanagawa, JP;
Hideo Shimizu, Kanagawa, JP;
Hanae Ikeda, Tokyo, JP;
Atsushi Shimbo, Tokyo, JP;
Tsukasa Endo, Tokyo, JP;
Yuichi Komano, Kanagawa, JP;
Koichi Fujisaki, Kanagawa, JP;
Hideo Shimizu, Kanagawa, JP;
Hanae Ikeda, Tokyo, JP;
Atsushi Shimbo, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to an embodiment, an encryption device performs encryption processing using an encryption key and calculates encrypted data from plain data. The encryption device includes: a register; an input unit configured to receive plain data; a first partial encryption unit configured to calculate first intermediate data from the plain data; a second partial encryption unit configured to calculate (i+1)-th intermediate data based on i-th intermediate data and the encryption key; a first transform unit configured to: transform j-th intermediate data into j-th transformed data; and store the j-th transformed data in the register; and a second transform unit configured to transform the j-th transformed data into the j-th intermediate data; a third partial encryption unit configured to calculate encrypted data from the N-th intermediate data. The second partial encryption unit is configured to repeat processing to calculate (j+1)-th intermediate data while j is equal to from 1 to N−1.