Nippon Telegraph and Telephone Corporation

Hidetaka Ishimoto

Satoshi Ono

Eiichi Horita

Akira Takura

An event-ordering certification systemincludes a certification apparatus, a plurality of user apparatuses(i=a, b, . . . , n), an audit apparatusfor performing an audit of an event-ordering receipt published by the certification apparatusand a networkfor connecting these elements with each other. In response to an event-ordering request from one user apparatus, the certification apparatuspublishes the event-ordering receipt and sends it to the user apparatus. If a mistrust is produced in the event-ordering receipt, the user apparatusverifies the event-ordering receipt with the use of data published by the certification apparatusand an audit result by the audit apparatus

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Tokorozawa, Japan

Hidetaka Ishimoto