SYSTEM AND TERMINAL FOR RADIO AD HOC COMMUNICATION, DECRYPTING METHOD AND ENCRYPTING METHOD IN THE TERMINAL, BROADCAST ENCRYPTING KEY DISTRIBUTING METHOD, AND PROGRAM FOR MAKING THE TERMINAL EXECUTE THE METHOD

摘要

PPROBLEM TO BE SOLVED: To autonomously and distributively manage a broadcast encryption key in a radio ad hoc communication system. PSOLUTION: Each terminal in the radio ad hoc communication system is provided with an encryption key management list table 660. This table 660 keeps a unicast encryption key 662 used for unicast communication with a terminal to be identified by a terminal identifier 661, and a broadcast encryption key 663 to be used when the terminal to be identified with the terminal identifier 661 performs broadcast communication, correlating to the terminal identifier 661 such as a MAC address. In this way, a broadcast encryption key is provided for each terminal performing broadcast communication, and each terminal manages the broadcast encryption key autonomously and distributively. PCOPYRIGHT: (C)2004,JPO&NCIPI