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:
Apr. 12, 2011
Filed:
Oct. 18, 2001
Taizo Shirai, Tokyo, JP;
Yoshihito Ishibashi, Tokyo, JP;
Kenji Yoshino, Tokyo, JP;
Toru Akishita, Chiba, JP;
Takeshi Ito, Tokyo, JP;
Shigekazu Hayashi, Tokyo, JP;
Taizo Shirai, Tokyo, JP;
Yoshihito Ishibashi, Tokyo, JP;
Kenji Yoshino, Tokyo, JP;
Toru Akishita, Chiba, JP;
Takeshi Ito, Tokyo, JP;
Shigekazu Hayashi, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An information recording device uses a data storage device such as media having a built-in flash memory. When data is stored in the data storage device, different encryption keys are used for different sectors. Each encryption key is stored in the header of content. By using a single encryption key for a sector consisting of different blocks, the number of stored encryption keys is limited, and the amount of stored key data is reduced. In accordance with the type of encryption processing, for example, the single DES or the triple DES, one or at least two keys are selected for each sector in order to execute encryption or decryption processing on sector data.