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Modern society is getting accustomed to the Internet of Things (IoT) andCyber-Physical Systems (CPS) for a variety of applications that involvessecurity-critical user data and information transfers. In the lower end of thespectrum, these devices are resource-constrained with no attack protection.They become a soft target for malicious code modification attacks that stealsand misuses device data in malicious activities. The resilient system requirescontinuous detection, prevention, and/or recovery and correct code execution(including in degraded mode). By end large, existing security primitives (e.g.,secure-boot, Remote Attestation RA, Control Flow Attestation (CFA) and DataFlow Attestation (DFA)) focuses on detection and prevention, leaving the proofof code execution and recovery unanswered. To this end, the proposed workpresents lightweight RARES -- Runtime Attack Resilient Embedded System designusing verified Proof-of-Execution. It presents first custom hardware controlregister (Ctrl_register) based runtime memory modification attacksclassification and detection technique. It further demonstrates the Proof OfConcept (POC) implementation of use-case-specific attacks prevention andonboard recovery techniques. The prototype implementation on Artix 7 FieldProgrammable Gate Array (FPGA) and state-of-the-art comparison demonstratesvery low (2.3%) resource overhead and efficacy of the proposed solution.

RARES: Runtime Attack Resilient Embedded System Design Using Verified Proof-of-Execution