| 摘要 |
PURPOSE:To provide the electronic cash system with which temporarily issued electronic cash can be dividedly utilized many times up to an amount decided at the time of issue. CONSTITUTION:A bank generates a utilization permit and delivers it to a user, the bank issues the electronic cash by using a blind signature and is provided with a hierarchically constituted table according to prescribed rules and when utilizing the electronic cash at a retail shop, the user uses the cash while dividing it into several times within the fixed amount at par value corresponding to the structure of the table. When the settlement of acounts of electronic cash is requested from the retail shop and the electronic cash is illegally used, the bank calculates the illegal user according to the private information of the user, which is used in the case of preparing the utilization permit, but when there is no illegality, the accounts are settled to the retail shop. |
