Using Ptychographic X-ray laminography to detect hardware backdoors

Detecting backdoors in hardware is hard. I just noticed this paper from last year:

X-Ray Tech Lays Chip Secrets Bare: Researchers in Switzerland and the U.S. have a non-destructive technique that can reverse engineer an entire chip without damaging it[…]

Ptychographic X-ray laminography can scan an entire chip or zoom in on a particular spot to reveal its circuits.

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