DYNAMIC SECURE GROUP MOBILE COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a dynamic secure group mobile communication system that can secure secret of communication by concealing information such as communication destination between mobile wireless terminals so as not to be known to a 3rd party. SOLUTION: In the communication system consisting of a base station 1 and a plurality of terminals 2, the terminals 2 are grouped into a plurality of groups 3. A same group key is delivered to the terminals belonging to the same group and a different group key is delivered to the terminals belonging to the different group. Communication information is encrypted by the group key and a destination is used for a group to conceal a destination terminal. The group key having given to the terminals 2 is optionally changed to dynamically change the group 3 to which the terminals 2 belong. Thus, the communication destination groups can be concealed in this way.