SERVICE AUTHENTICATION METHOD AND SYSTEM WHICH CONSTITUTE CLOSED COMMUNICATION ENVIRONMENT IN OPEN COMMUNICATION ENVIRONMENT

摘要

PROBLEM TO BE SOLVED: To provide an authentication method and others which constitute a closed communication environment in an open communication environment.SOLUTION: A terminal transmits a first page acquisition request to a content site server. The content site server returns a first redirect response including a site identifier of the content site server. The terminal transmits a second page acquisition request including the site identifier of the content site server and authentication information of the terminal to a service authentication server. The service authentication server authenticates whether a user of the terminal is a pre-registered service subscriber on the basis of the site identifier of the content site server and the authentication information of the terminal. The service authentication server transmits a second redirect response for the content site server to the terminal. The terminal transmits a third page acquisition request to the content site server. The content site server returns a page corresponding to the third page acquisition request to the terminal.