| 摘要 |
PROBLEM TO BE SOLVED: To cancel the issue of an electronic check which has been already issued. SOLUTION: A check A whose issue is desired to be canceled is sent from a user terminal 10 to a recipient-a terminal 400 (a), which selects issue information (issue amount is 1000 yen, balance is 2,000 yen) and sends the signature Ca of the terminal 400 (a) for its signature S to the terminal 100, and the terminal 100 checks the signature and generates and sends information (issue amount is 500 yen, balance is 500 yen) on the issue of the balance 500 yen to itself to a check issue management institution device 300 together with the check A and the issue information and signature Ca received from the terminal when the signature passes the check. The device 300 checks the respective pieces of received information, adds the balance 500 yen to issue cancel amount 1,000 yen when the check is passed to generate a new check B having an issue amount of 1,500 yen, and sends the check to the terminal 100 while making 0 to 2,000 yen of the check A used. |
