Copy Protection in Modern Microcontrollers
cl.cam.ac.uk
cl.cam.ac.uk
https://www.aisec.fraunhofer.de/content/dam/aisec/Dokumente/...
I remember Fraunhofer doing some interesting research using PUFs creating a foil device that covers special chips, where if the foil is tampered with, the memory of the chip is disrupted.
It's called PEP foil if I recall correctly.
Sergei's PhD thesis, is also an amazing read in case anyone hasn't seen it -