Control systems are built for safety, not security. This means that they are built with the assumption that random equipment failure happens and has to be caugh

Control systems are built for safety, not security. This means that they are built with the assumption that random equipment failure happens and has to be caught. There is no regard for security aspects. In particular, there are typically no safeguards against deliberate malicious intent. For example, in common field buses, once it is confirmed that a message transmission was free of errors, the message itself is typically taken at face value and acted upon. There is no way to verify sender identity.