System and method for issuing an authentication key for authenticating a user in a CPNS environment

A system for issuing an authentication key for user authentication in a converged personal network service (CPNS) environment, the system comprising:

• a user terminal which is equipped with a short-range wireless communication function, requests a gateway to register terminal information including an ID and password, encrypts the terminal information including the ID and password using the password when the ID and password for use of a CPNS are input, transmits an authentication request signal including the encrypted terminal information to the gateway, and receives an authentication key generated by a CPNS device;
• the gateway which is equipped with a mobile communication function or a short-range wireless communication function, transmits the encrypted terminal information to the CPNS device through a mobile communication network in response to the terminal information registration request from the user terminal, and when the authentication request signal is received from the user terminal, transmits the encrypted terminal information to the CPNS device to request authentication;
• and
• the CPNS device which stores the encrypted terminal information from the gateway, performs user authentication by decrypting the encrypted terminal information in response to the authentication request from the gateway, generates an authentication key for the CPNS when a user is authenticated, encrypts the generated authentication key using the password, and transmits the encrypted authentication key to the user terminal through the gateway,
• wherein the gateway stores the encrypted terminal information in response to the terminal information registration request from the user terminal, performs user authentication by decrypting the encrypted terminal information when the authentication request signal is received from the user terminal, generates an authentication key for the CPNS when the user is authenticated, encrypts the generated authentication key using the password, and transmits the encrypted authentication key to the user terminal and the CPNS device.