| 摘要 |
PROBLEM TO BE SOLVED: To provide a one-time password system which can easily be operated at low cost safely in terms of security without managing passwords, etc., and to enable the settlement of a purchase of an article on the Internet, etc., without informing the seller side of buyer's personal information. SOLUTION: A user of portable telephone in the case of communicating can report who the user is to the opposite party. By this function, (3) is able to specify who (1) is. Then (3) informs (1) of a temporary ID and a temporary password which are usable only once in a certain time. When (2) authenticates (1), (3) is notified of the temporary ID and temporary password sent from (1). Then (3) compares the temporary ID and temporary password that (3) oneself issued with the temporary ID and temporary password from (2) to confirm that (1) that (3) oneself communicated with is the same person as (1) that (2) is communicating with. |
