As already noted in this book, the concept of securing cyber-physical systems is a superset of what we normally understand by cybersecurity and information security.
To properly represent the scope of IIoT security, the term trustworthiness is used (NIST-CPS) (IIC-IISF). A working definition of trustworthiness for CPS, according to NIST-CPS, is:
"Trustworthiness is the demonstrable likelihood that the system performs according to designed behavior under any set of conditions as evidenced by characteristics including, but not limited to, safety, security, privacy, reliability and resilience."
Trustworthiness of an IIoT system is an important stakeholder expectation. To make an IIoT system trustworthy, security characteristics of both IT and OT domains must be combined (IIC-IISF). As shown in Figure 2.6, the key characteristics of a trustworthy IIoT system combine the elements of IT trustworthiness (privacy, security, reliability, and resilience) and OT trustworthiness...
