Beyond Just Safety: Delay-aware Security Monitoring for Real-time Control Systems
Monowar Hasan, Sibin Mohan, Rakesh B. Bobba, Rodolfo Pellizzoni · ACM Transactions on Cyber-Physical Systems · 2022
Modern embedded real-time systems (RTS) are increasingly facing more security threats than the past. A simplistic straightforward integration of security mechanisms might not be able to guarantee thesafetyand predictability of such systems. In this article, we focus on integrating security mechanisms into RTS (especiallylegacyRTS). We introduceContego-C, an analytical model to integrate security tasks into RTS that will allow system designers to improve the security posture without affecting temporal and control constraints of the existing real-time control tasks. We also define ametric(named tightness of periodic monitoring) to measure the effectiveness of such integration. We demonstrate our ideas using a proof-of-concept implementation on an ARM-based rover platform and show that Contego-C can improve security without degrading control performance.