SCADA system effective key management method in a communication environment

摘要

master station (MTU), a number of sub-station (SUB-MTU), a plurality of remote terminals (RTU ) relates to the shared key of the group key for a communication in SCADA (Supervisory Control And Data Acquisition) system consisting of a sequence of layers in the administration method, (a) the master terminal device is assigned to a remote terminal comprising: generating a secret key ; (B), but generates a group key in the tree structure, the shared key for each node in the group key is generated by hashing the shared keys for all of the child nodes, the shared key of the leaf node of the group key is a secret key of the remote terminal determined step ; (C) receiving and storing the remote terminal or sub-terminal is a shared key to the root node of the node that corresponds to the own; (D) When the remote terminal or sub-terminal is added or removed, the master terminal device again generating the shared key of the node in the route to the root node of the node corresponding to the terminal to which the added or deleted; (E) the remote terminal or sub-terminal is provided a composition including receiving and storing the generated shared key again. ; by the key management method of the SCADA system, the communication environment as described above, If encrypted messages by broadcasting or multicasting, the effect of reducing the amount of computation that is generated can be obtained.