No safety in hardware from Side Channel Attacks

In 2017 Ronan Lashermes' team published a paper entitled "How TrustZone could be bypassed: Side-Channel Attacks on a modern System-on-Chip". In it they carefully describe their work and point out that "enabling the secure mode of TrustZone has no effect whatsoever on the EMA [electromagnetic analysis] efficiency. Therefore, critical applications in TrustZone are not more secure than in the normal world with respect to EMA, in accordance with the fact that it is not a countermeasure against physical attacks".