| 摘要 |
When a user 1 applies for a service via a portable phone device 4a to which an external device 4b is connected, an authentication reception server 3 transmits a notice of authentication receipt to the portable phone device 4a. The external device 4b, in response to this notice, transmits authentication information via the portable phone device 4a. When the authentication reception server 3 determines that the authentication information is correct, it requests a key issuance server 5 to issue an access key. The key issuance server 5 issues a common access key to the portable phone device 4a and the service provision server 2. The external device 4b transmits this access key to a service provision server 2 via the portable phone device 4a to apply for the service. The service provision server 2 provides the service to the user 1 who transmits the common access key issued by the aforementioned server 5. Accordingly, it is possible to simplify steps of authentication and also restrain unauthorized access by performing reliable authentication. <IMAGE> |
