Detection and Analysis Technique for Manipulation Attacks on PLC Control Logic

In recent years, 1 a large number of studies have been conducted on cybersecurity for Programmable Logic Controllers (PLCs) to cope with cyberattacks on Industrial Control Systems(ICS). However, few studies have been conducted on ensuring cybersafety for control logics running inside PLCs. In this study, a technique for detecting an attack on PLC control logic change was proposed by analyzing the network protocol data and project file structure. Based on the analysis results for the proposed technique, a tool was implemented to detect an manipulation attack on control logic, and whether such attack was detected or not was verified through experiments.