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Design tamper proof enclosure + detection circuitry

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Miyuki:
Wonder if I can find here somebody with experience in this field and who won't cost me an arm and leg.

This year, I will probably be designing a product, where I want physical protection against any access to the processor what is that is holding encryption keys (battery backup RAM) and doing some crypto fun.
The processor has a tamper signal input to discard data in this memory.
So I will need to have some kind of shield to activate it. It can be potted, which is probably a good thing to do.

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