Data authenticity assurance method, management computer, and storage medium

• Main Authors: Hayashi Naoki, Isobe Yoshiaki, Watanabe Natsuki, Miyazaki Kunihiko, Anzai Kosuke, Kumagai Tomohisa, Miyamoto Daisuke, Hashimoto Yoko
• Format: Patent
• Language: English
• Published: 16.08.2016
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

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.