Hitachi, Ltd.

Tomohisa Kumagai

Kunihiko Miyazaki

Naoki Hayashi

Yoshiaki Isobe

Yoko Hashimoto

Daisuke Miyamoto

Kosuke Anzai

Natsuki Watanabe

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.

Data authenticity assurance method, management computer, and storage medium

Growing community of inventors

Tokyo, Japan

Tomohisa Kumagai