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:
Feb. 10, 2015
Filed:
Aug. 07, 2012
Hideo Shimizu, Kanagawa, JP;
Hideo Shimizu, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to an embodiment, an arithmetic device includes an arithmetic processing unit, an address generating unit, and a control unit. The arithmetic processing unit performs a plurality of arithmetic processing used in an encryption method. Based on an upper bit of the address of the first piece of data and based on an offset which is a value corresponding to a counter value and which is based on the address of the first piece of data, the address generating unit generates addresses of the memory device. The control unit controls the arithmetic processing unit in such a way that the arithmetic processing is done in a sequence determined in the encryption method, and that specifies an update of the counter value at a timing of modifying the type of data and at a timing of modifying data.