| 摘要 |
PROBLEM TO BE SOLVED: To perform a settlement having real time property and high security and requiring no authentication data directly connected to an individual. SOLUTION: A purchaser-side act comprises the act of inputting the ID of the purchaser, the n-th act of inputting the n-th password used in the n-th time to a terminal, the act of inputting the (n+1)-th password to the terminal, and the act of inputting a content to the terminal. A seller-side act comprises the act of distributing the content to the purchaser and the act of subtracting the sum corresponding to the content from the balance of a database. Since the collation of the sellers own unchangeable serial number with the changeable password is performed every time, and the password can be changed every purchase, the security is sharply enhanced. Further, since it is substantially equivalent to a change for a third person not to change the password in the changeable state, the change of the password every time is dispensed with. Accordingly, prepaid cards can be safely distributed to an unspecified number of persons. |
