| 摘要 |
PROBLEM TO BE SOLVED: To provide a host device capable of improving the self protection property.SOLUTION: An own device signature is added to first information at least including information that requests for resolution of a name held by an origination destination device to be reached. The first information and the own device signature are transmitted to a system structured to include a registration server for registering second information related to the origination destination device so that the system can find the registration server. When the second information is transmitted from the registration server after transformed to encrypted information by encryption based on an ID of the own device and incorporated with a server signature that is a signature of the registration server, the encrypted information and the server signature are received, and justifiability of the server signature is verified, and then, the second information is obtained by decryption from the encryption information. |
