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:
Aug. 30, 2011
Filed:
Jan. 17, 2007
Toshio Okochi, Musashino, JP;
Takashi Endo, Musashimurayama, JP;
Takashi Watanabe, Kokubunji, JP;
Tatsuya Kameyama, Hachioji, JP;
Shunsuke Ota, Kokubunji, JP;
Toshio Okochi, Musashino, JP;
Takashi Endo, Musashimurayama, JP;
Takashi Watanabe, Kokubunji, JP;
Tatsuya Kameyama, Hachioji, JP;
Shunsuke Ota, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An increase in safety from attacks by use of hardware-like methods by small-sized hardware is achieved. An encryption processing device includes a logical circuit capable of programmably setting logics for executing cipher processing, a memory that stores plural pieces of logical configuration information corresponding to an identical cipher processing algorithm, and a CPU that selectively sets plural logics corresponding to an identical cipher processing algorithm in the logical circuit. Even in processing using an identical cipher key, by changing the logic of the logical circuit for each processing, power consumption in cipher processing can be varied, and places a timing in which malfunctions occur can be varied. Moreover, an increase in the scale of hardware for realizing plural logics can be curbed.