Visible to the public Vulnerability of Transportation Networks to Traffic-Signal Tampering

TitleVulnerability of Transportation Networks to Traffic-Signal Tampering
Publication TypeConference Paper
Year of Publication2016
AuthorsAron Laszka, Bradley Potteiger, Yevgeniy Vorobeychik, Saurabh Amin, Xenofon Koutsoukos
Conference Name7th ACM/IEEE International Conference on Cyber-Physical Systems (ICCPS)
Date PublishedApril
Keywordsattack-resilience, cps resiliency, cyber-security, Network security, pubcrawl, Resiliency, Resilient Systems, science of security, Security in Hardware, SURE Project, tampering attack, traffic model, Transportation network

Traffic signals were originally standalone hardware devices running on fixed schedules, but by now, they have evolved into complex networked systems. As a consequence, traffic signals have become susceptible to attacks through wireless interfaces or even remote attacks through the Internet. Indeed, recent studies have shown that many traffic lights deployed in practice have easily exploitable vulnerabilities, which allow an attacker to tamper with the configuration of the signal. Due to hardware-based failsafes, these vulnerabilities cannot be used to cause accidents. However, they may be used to cause disastrous traffic congestions. Building on Daganzo's well-known traffic model, we introduce an approach for evaluating vulnerabilities of transportation networks, identifying traffic signals that have the greatest impact on congestion and which, therefore, make natural targets for attacks. While we prove that finding an attack that maximally impacts congestion is NP-hard, we also exhibit a polynomial-time heuristic algorithm for computing approximately optimal attacks. We then use numerical experiments to show that our algorithm is extremely efficient in practice. Finally, we also evaluate our approach using the SUMO traffic simulator with a real-world transportation network, demonstrating vulnerabilities of this network. These simulation results extend the numerical experiments by showing that our algorithm is extremely efficient in a microsimulation model as well.

Citation KeyLaszkaPotteigerVorobeychikAminKoutsoukos16_VulnerabilityOfTransportationNetworksToTrafficSignal