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:
Oct. 16, 2007
Filed:
May. 24, 2002
Takashi Watanabe, Kokubunji, JP;
Masahiro Kaminaga, Sakado, JP;
Takashi Endo, Musashimurayama, JP;
Seiichi Kumano, Yokohama, JP;
Takashi Watanabe, Kokubunji, JP;
Masahiro Kaminaga, Sakado, JP;
Takashi Endo, Musashimurayama, JP;
Seiichi Kumano, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An information processing unit and methods therefore which render it more difficult to infer information being processed within an information processing unit by observing the unit's current consumption or electromagnetic radiation. Specifically, the information processing unit preferably encrypts and decrypts data when the data is read from/written to memories within the unit. The encryption/decryption process may include the use of multiple cryptographic keys, permutated data storage locations, randomly generated keys, and permutated data processing steps.