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Yes, full PCIe HSMs etc are an interesting regime. I saw some very cool Virtex-6 based hardware from a major Wall Street company a while back. I'd love to try my hand at designing one some day.
I've given some thought to centralizing secret management on effectively an off the shelf SBC (using remote U2F and the like to log in) and then seeing how much you can tamper-proof it physically. There's also betrusted: https://betrusted.io/betrusted-architecture/#custom-soc …
