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. 04, 2020
Filed:
Aug. 19, 2016
Applicant:
Hitachi, Ltd., Tokyo, JP;
Inventors:
Masayuki Yoshino, Tokyo, JP;
Hisayoshi Sato, Tokyo, JP;
Assignee:
HITACHI, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 21/00 (2013.01); G06F 21/62 (2013.01); H04L 9/00 (2006.01); H04L 9/08 (2006.01); G06F 16/907 (2019.01); H04L 9/06 (2006.01); G06F 16/953 (2019.01);
U.S. Cl.
CPC ...
G06F 21/6227 (2013.01); G06F 16/907 (2019.01); G06F 16/953 (2019.01); H04L 9/008 (2013.01); H04L 9/06 (2013.01); H04L 9/0662 (2013.01); H04L 9/0869 (2013.01); H04L 9/0891 (2013.01); G06F 2221/2107 (2013.01);
Abstract
In this searchable encryption processing system in which a registered client and a management server are connected via a network, the registered client is provided with a registered client processing unit that generates, on the basis of the difference between a first secret key for encrypting plaintext data and a second secret key for newly encrypting the plaintext data, a difference key mask for updating, by using the second secret key, confidential data encrypted by the first secret key.