This position statement gives the opinion of the ISA Working Group on security and safety in so far as it affects independent safety assessment and ISAs. Its primary focus is on security and safety when these depend, at least in part, on electrical, electronic or programmable electronic systems. However, the general principles also apply to security and safety of systems that use other technologies.
Independent safety assessment involves coming to a judgement about the safety of a system. The safety of potentially hazardous systems depends in part on provision of adequate security to protect against unauthorised or malicious interference with the system. This implies that independent safety assessment must address security-related aspects of safety. Security is therefore of both interest and importance for ISAs.