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Securing the supply chain of information and communications technology (ICT)has recently emerged as a critical concern for national security and integrity.With the proliferation of Internet of Things (IoT) devices and their increasingrole in controlling real world infrastructure, there is a need to analyze risksin networked systems beyond established security analyses. Existing methods inliterature typically leverage attack and fault trees to analyze maliciousactivity and its impact. In this paper, we develop RIoTS, a security riskassessment framework borrowing from system reliability theory to incorporatethe supply chain. We also analyze the impact of grouping within suppliers thatmay pose hidden risks to the systems from malicious supply chain actors. Theresults show that the proposed analysis is able to reveal hidden threats posedto the IoT ecosystem from potential supplier collusion.

RIoTS: Risk Analysis of IoT Supply Chain Threats