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. 16, 2016
Filed:
Oct. 02, 2012
Hitachi, Ltd., Tokyo, JP;
Natsuki Watanabe, Tokyo, JP;
Yoko Hashimoto, Tokyo, JP;
Kosuke Anzai, Tokyo, JP;
Kunihiko Miyazaki, Tokyo, JP;
Naoki Hayashi, Tokyo, JP;
Yoshiaki Isobe, Tokyo, JP;
Tomohisa Kumagai, Tokyo, JP;
Daisuke Miyamoto, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
A data authenticity assurance method carried out by a management computer including: a first step of receiving the first data piece from the computer; a second step of selecting a plurality of second data pieces at predetermined intervals in chronological order from among the plurality of second data pieces held in the data holding part; a third step of performing an arithmetic operation for each of the hash values of the selected plurality of second data pieces; a fourth step of generating signature target data by combining the first data piece received from the computer with the hash values of the selected plurality of second data pieces; and a fifth step of generating a second data piece by assigning the digital signature to the signature target data by using the preset key, and holding the generated second data piece in chronological order sequentially in the data holding part.