SINGLE SIGN-ON SYSTEM, INFORMATION TERMINAL DEVICE, SINGLE SIGN-ON SERVER, PROGRAM

摘要

PROBLEM TO BE SOLVED: To improve a method for materializing single sign-on without revising a service providing server for providing services.;SOLUTION: An SSO server 30 has: a server connection part 36 which transmits, to a server 18 specified by server connection request transmitted form a client 20, an authentication request including an IP address to be used for communication with the server 18 and authentication information of the SSO server 30, receives user authentication and then establishes a session with the server 18; a session interruption part 37 for stopping the use of the address being used for the communication with the server 18; and a session information transmission part 35 for transmitting information on the session established with the server 18 to the client 20. The client 20 has a communication control part 23 which uses an IP address included in the received session information to take over the session established by the SSO server 30 and communicates with the server 18.;COPYRIGHT: (C)2008,JPO&INPIT