  To cope with the ever increasing threats of dynamic and adaptive persistent
attacks, Fault and Intrusion Tolerance (FIT) is being studied at the hardware
level to increase critical systems resilience. Based on state-machine
replication, FIT is known to be effective if replicas are compromised and fail
independently. This requires different ways of diversification at the software
and hardware levels. In this paper, we introduce the first hardware-based
rejuvenation framework, we call Samsara, that allows for creating new computing
cores (on which FIT replicas run) with diverse architectures. This is made
possible by taking advantage of the programmable and reconfigurable features of
MPSoC with an FPGA. A persistent attack that analyzes and exploits the
vulnerability of a core will not be able to exploit it as rejuvenation to a
different core architecture is made fast enough. We discuss the feasibility of
this design, and we leave the empirical evaluations for future work.

Cryptography and Security;Hardware Architecture