RADIO AD HOC COMMUNICATION SYSTEM, TERMINAL, ATTRIBUTE CERTIFICATE ISSUING PROPOSAL METHOD AND ATTRIBUTE CERTIFICATE ISSUING REQUEST METHOD AT THE TERMINAL, AND A PROGRAM FOR EXECUTING THE METHODS

摘要

A radio ad hoc communication system capable of performing attribute certificate issuing under autonomous distributed control. A terminal (B200) transmits a beacon (2011) so as to enter the network of the radio ad hoc communication system. This beacon (2011) indicates whether the terminal (B200) has an attribute certificate. A terminal (A100) which has received the beacon (2011) checks the beacon. If it is judged that the terminal (B200) does not have an attribute certificate, the terminal (A100) transmits an attribute certificate issuing proposal message (1032) which proposes the terminal (B200) to request issuing of an attribute certificate. When the terminal (B200) transmits an attribute certificate issuing request message (2041) in response to this, the terminal (A100) transmits an attribute certificate issuing message (1052) to the terminal (B200).