| 摘要 |
A method and a device for the dynamic setting up and control of temporarily formed communications groups with secure transmission, in which nodes potentially participating in a communications group are connected via a common transmission medium. The transmission medium enables an efficient transmission of so-called broad- and/or multicast-messages. The dynamic and automatic setting up of a communications group is then carried out in the following steps: From an initiator node a broadcast message is first sent out, which includes at least one group identifier, an identifier and address of the initiator node, and information about the communications group. This message is analyzed by all nodes accessible via the transmission medium and thereby authenticated by the initiator nodes. From those nodes that are participating in the communications group, a unicast message with at least their identifier and address is sent back to the initiator node. The participating nodes are authenticated by the initiator node by the receipt of the unicast messages, and unicast messages with at least one multicast-identifier and a security key are then sent to the participating nodes. An asymmetric encryption system for example can be used for the authentication.
|
