| 摘要 |
PROBLEM TO BE SOLVED: To provide a system for detecting unauthorized communication, without applying the processing load to a controller.SOLUTION: Gateway units 20, ..., 20include ID generation units 201, ..., 201generating the identification information of the own gateway unit, detection packet generation units 202, ..., 202for generating a detection packet including the control information transmitted from the controller, and the route information obtained by giving the identification information of the own gateway unit to the communication packet, and log generation units 203, ..., 203for generating the log information including the detection packet, and transmits the log information to a management server 30. The management server receives the log information from a gateway unit, previously stores the assumption route information, obtained by extracting the route information from the log information, in the storage unit, and detects an unauthorized communication packet on the basis of the assumption route information stored in the storage unit, and the route information included in the log information.SELECTED DRAWING: Figure 1 |
