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Using epoxy resin embedding w/ non-conductive glitter and photo identitifcation cards, it should be possible to create a tamper resistant case for microcontrollers which are otherwise physically insecure - given the above.
You can still voltage/clock glitch the things pretty easily through epoxy; if you need to disable decoupling capacitors that's pretty easy to do with a well-placed drill hole. TBH decapsulation isn't even that hard.
The point is they'd have to cause physical damage and the glitter would be impossible to replicate without extreme cost. It isn't to make the device tamper proof, just tamper resistant for a few minutes or so.
Yeah, but revoking PGP/SSH keys is less trivial, so a higher level of physical tamper resistance to key extraction is desirable depending on your use case.
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