PACKET MONITORING DEVICE AND PACKET MONITORING METHOD FOR COMMUNICATION PACKET

摘要

According to an embodiment of the present invention, a package monitoring method includes: a step of receiving a communication packet which is transmitted and received between a server and a control device; a step of determining whether the received communication packet is abnormal on the basis of a history table including control information of communication packets which are received earlier than the received communication packet and control information of the received communication packet; and a step of performing a security operation in accordance with a determination result.