AUTHENTICATION METHOD, AUTHENTICATION SYSTEM, AND AUTHENTICATION SERVER

摘要

User authentication processing is executed and an authentication session ID is returned to a terminal (500) (A14). An authentication server (600) issues/holds an authentication ticket (A17). The authentication ticket and the authentication session are returned to the terminal (500) (A18). A user (100) transmits a request for providing a service and the authentication ticket to a service providing company server (700) and the service providing company server (700) transmits the authentication ticket to an authentication server (600) (A20). The authentication server (600) performs authentication processing of the authentication ticket (A21) and the authentication result is reported (A22). In case of authentication permission, a notification for permission and a service session ID are issued (A23). When the notification of the authentication permission is received, the terminal (500) establishes a session by using the service session ID received and holds the service session ID (A27).