Patent ID: 8347076

Claim:
A system for building a home domain, the system comprising: a guest device, legality of which is authenticated by a master device in a home domain of the system for building the home domain; and a portable data storage medium, which stores device information about the guest device, wherein the device information stored on the portable data storage medium about the guest device, after the legality of the guest device is authenticated by the master device, is read by the master device and used for the master device to join the guest device to the home domain by changing the guest device which is in a guest mode to a slave device in a slave mode of the home domain which uses content of the master device; and wherein the system for building the home domain is in a home network which includes a plurality of slave devices of the home domain and a plurality of guest devices which are not in the home domain, wherein, when the device information is read by the master device, the master device transmits a challenge request signal to the guest device, the guest device generates a challenge value in response to the challenge request signal and transmits the challenge value to the master device, the master device encrypts the challenge value using a predetermined encryption algorithm and transmits the encrypted challenge value to the guest device, the guest device decrypts the encrypted challenge value using the predetermined encryption algorithm and determines whether the decrypted challenge value is the same as the generated challenge value, and when the decrypted challenge value is the same as the generated challenge value, the guest device allows the master device to join the guest device to the home domain, and wherein after authentication of the guest device, the master device transmits a device mode change signal to the guest device and the guest device changes to the slave mode.