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To cope with the ever increasing threats of dynamic and adaptive persistentattacks, Fault and Intrusion Tolerance (FIT) is being studied at the hardwarelevel to increase critical systems resilience. Based on state-machinereplication, FIT is known to be effective if replicas are compromised and failindependently. This requires different ways of diversification at the softwareand hardware levels. In this paper, we introduce the first hardware-basedrejuvenation framework, we call Samsara, that allows for creating new computingcores (on which FIT replicas run) with diverse architectures. This is madepossible by taking advantage of the programmable and reconfigurable features ofMPSoC with an FPGA. A persistent attack that analyzes and exploits thevulnerability of a core will not be able to exploit it as rejuvenation to adifferent core architecture is made fast enough. We discuss the feasibility ofthis design, and we leave the empirical evaluations for future work.

System on Chip Rejuvenation in the Wake of Persistent Attacks