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In this paper, we set out to systematically design a minimal active RoT fortiny low-end MCU-s. We begin with the following questions: (1) What functionsand hardware support are required to guarantee actions in the presence ofmalware?, (2) How to implement this efficiently?, and (3) What securitybenefits stem from such an active RoT architecture? We then design, implement,formally verify, and evaluate GAROTA: Generalized Active Root-Of-TrustArchitecture. We believe that GAROTA is the first clean-slate design of anactive RoT for low-end MCU-s. We show how GAROTA guarantees that even a fullysoftware-compromised low-end MCU performs a desired action. We demonstrate itspracticality by implementing GAROTA in the context of three types ofapplications where actions are triggered by: sensing hardware, network eventsand timers. We also formally specify and verify GAROTA functionality andproperties.

GAROTA: Generalized Active Root-Of-Trust Architecture