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Energy harvesting is a promising solution to power Internet of Things (IoT)devices. Due to the intermittent nature of these energy sources, one cannotguarantee forward progress of program execution. Prior work has advocated forcheckpointing the intermediate state to off-chip non-volatile memory (NVM).Encrypting checkpoints addresses the security concern, but significantlyincreases the checkpointing overheads. In this paper, we propose a new onlinecheckpointing policy that judiciously determines when to checkpoint so as tominimize application time to completion while guaranteeing security. Comparedto state-of-the-art checkpointing schemes that do not account for the overheadsof encrypted checkpoints we improve execution time up to 1.4x.

Optimal Checkpointing for Secure Intermittently-Powered IoT Devices