To surely communicate data between the members of a group of mobile devices, using a wireless channel.
The members include a group leader. Each member is associated with a physical token. Each member and associated token stores a binding key. Each member also stores an identification. A session key is stored by the group leader. Each token generates a member key, which is encrypted with the binding key and transmitted to the member where it is decrypted and stored. The session key is distributed surely to each member. Each member key is surely passed to the group leader. Then, the data to be communicated between the group leader and a particular member can be encrypted, by using the associated member key of the particular member and the session key.
NABUNAKA TATSUJI
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order
Kazuhiro Oyaku
Shunichi Ueda