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, 2016
Filed:
Sep. 03, 2014
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Yoshiyuki Kudoh, Kawasaki, JP;
Yasuto Aramaki, Kawasaki, JP;
Taichiro Yamanaka, Hino, JP;
Hiroki Udagawa, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Abstract
A storage device includes a non-volatile memory having a plurality of storage areas. Received data is encrypted with a first cryptographic key and stored in one of the storage areas. Upon receiving an request from a host, a key processor replaces the first cryptographic key used to encrypt data stored on a specified one of the non-volatile memories with a different cryptographic key not previously used for any of the storage areas by generating a second cryptographic key, converting the previously used keys into first value by an operation, converting the candidate key into a second value by the same operation. The first and second values are compared, and when the first information is not the same as the second information, the second cryptographic key replaces the first cryptographic key, and when not, the second cryptographic key is discarded and a new second cryptographic key generated.