摘要：Cyber physical systems (CPS) are computer systems that integrate computing, coordination and communication systems in order to monitor physical entities in the physical world. As they interact with the critical systems and infrastructure that may impact real life. There are many issues in design and constructions of these types of systems. One of the key issue that receives so many attention is the security of such systems. Although security solutions for Information Systems handle the security issues associated with Traditional IT security, but the impact of a failure in a cyber-physical system demands a different approach to handle security issues related to the cyber world. In this work, we focus on using a key agreement technique known as Physical Signal Key Agreement (PSKA) technique using the Exact Cover method to generate the random key which will be embedded into an access control model known as the Modified Context-Aware Security The feasibility of our framework (MCASF) to handle both normal and critical situation on demand is demonstrated via a Pervasive Health Monitoring Systems (PHMS).
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