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Over-the-Air (OTA) software updates are becoming essential forelectric/electronic vehicle architectures in order to reduce recalls amid theincreasing software bugs and vulnerabilities. Current OTA update architecturesrely heavily on direct cellular repository-to-vehicle links, which makes therepository a communication bottleneck, and increases the cellular bandwidthutilization cost as well as the software download latency. In this paper, weintroduce ScalOTA, an end-to-end scalable OTA software update architecture andsecure protocol for modern vehicles. For the first time, we propose using anetwork of update stations, as part of Electric Vehicle charging stations, toboost the download speed through these stations, and reduce the cellularbandwidth overhead significantly. Our formalized OTA update protocol ensuresproven end-to-end chain-of-trust including all stakeholders: manufacturer,suppliers, update stations, and all layers of in-vehicle Electric Control Units(ECUs). The empirical evaluation shows that ScalOTA reduces the bandwidthutilization and download latency up to an order of magnitude compared withcurrent OTA update systems.

ScalOTA: Scalable Secure Over-the-Air Software Updates for Vehicles