Pulsed Electromagnetic Fault Injection Attack on Ring Oscillator-based PUFs in FPGAs
Résumé
Physical Unclonable Functions (PUFs) have emerged as a promising solution to overcome the limitations of conventional secure key storage and random key generation techniques on Integrated Circuits (ICs). Among the various PUF architectures, Ring Oscillator-based PUFs can be employed in FPGAs to generate unique responses due to their cost-effective and efficient implementation. However, their robustness against fault injection attacks remains a real concern. In this paper, we present a novel scenario whereby pulsed Electromagnetic Fault Injection (EMFI) can alter the PUF’s response and significantly threaten its robustness. By exploiting the harmonic locking susceptibility of a RO under pulsed EMFI, we demonstrated how different parameters of the EM pulse and the PUF implementation can influence the severity of the attack. Based on our findings, some general guidelines are derived to harden RO-based PUFs against pulsed EMFI.
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