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MIL-STD-1553, a standard that defines a communication bus for interconnecteddevices, is widely used in military and aerospace avionic platforms. Due to itslack of security mechanisms, MIL-STD-1553 is exposed to cyber threats. Themethods previously proposed to address these threats are very limited,resulting in the need for more advanced techniques. Inspired by the defense indepth principle, we propose AnoMili, a novel protection system for theMIL-STD-1553 bus, which consists of: (i) a physical intrusion detectionmechanism that detects unauthorized devices connected to the 1553 bus, even ifthey are passive (sniffing), (ii) a device fingerprinting mechanism thatprotects against spoofing attacks (two approaches are proposed: prevention anddetection), (iii) a context-based anomaly detection mechanism, and (iv) ananomaly explanation engine responsible for explaining the detected anomalies inreal time. We evaluate AnoMili's effectiveness and practicability in two real1553 hardware-based testbeds. The effectiveness of the anomaly explanationengine is also demonstrated. All of the detection and prevention mechanismsemployed had high detection rates (over 99.45%) with low false positive rates.The context-based anomaly detection mechanism obtained perfect results whenevaluated on a dataset used in prior work.

AnoMili: Spoofing Prevention and Explainable Anomaly Detection for the 1553 Military Avionic Bus