Methods for Protecting Control Commands in the Instrumental Environment for Automated Process Control Systems
The paper discusses methods that ensure the execution of only correct and legal control commands in the process control system. Protection of the integrity of the APCS software at all nodes of the industrial network, including protection against unauthorized substitution, is carried out by checking the control parameters of the software during their startup. Protection of control commands from distortions during transmission over the network is realized by double coding at different levels of the system. Protection against the submission of unauthorized control commands to technological equipment is carried out by recognizing these commands in the lower-level subsystem and comparing their current characteristics with the control ones.A certain contribution to the safety of the process control system is made by the use of a secure execution environment - OS CentOS 7.