Quantitative Safety and Security Analysis from a Communication Perspective

This paper introduces and exemplifies a trade-off analysis of safety and security properties in distributed systems. The aim is to support analysis for real-time communication and authentication building blocks in a wireless communication scenario. By embedding an authentication scheme into a real-time communication protocol for safety-critical scenar-ios, we can rely on the protocol’s individual safety and secu-rity properties. The resulting communication protocol satis-fies selected safety and security properties for deployment in safety-critical use-case scenarios with security requirements. We look at handover situations in a IEEE 802.11 wireless setup between mobile nodes and access points. The trade-offs involve application-layer data goodput, probability of completed handovers, and effect on usable protocol slots, to quantify the impact of security from a lower-layer commu-nication perspective on the communication protocols. The results are obtained using the network simulator ns-3