Method and system for public key authentication of a device in home network

A device authentication method comprising:

• maintaining a public key list that includes an identifier (ID) and public key information corresponding to the ID of home network devices of the home network;
• receiving a request to delete an ID and corresponding public key information of a leaving device;
• requesting the home network devices to delete the ID and the public key information of the leaving device;
• and
• updating the public key list by deleting the ID and the public key information of the leaving device from the public key list,
• wherein the leaving device is a device that leaves the home network.

A device authentication system comprising:

• a database which stores a public key list that includes an identifier (ID) and corresponding public key information of a device of a home network;
• a general communication section which requests and receives the ID and the corresponding public key information of the device;
• a location limited channel communication section which requests an ID and corresponding public key information of a joining device and transmits the public key list over a location limited channel, wherein the joining device is a device that is not previously registered to the home network;
• a retrieval section which retrieves the ID and the corresponding public key information of the device from the public key list;
• and
• an update section which receives from the joining device the ID and the public key information of the joining device and updates the public key list to include the ID and the public key information of the joining device.