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even without thunderbolt I wonder how useful this is on regular PCIe slots when, say, retrieving disk-encryption keys out of memory from a running system
If your system supports PCIe hotplug (some do! yes this is a thing), yup, that's an attack vector too. But PCs have ~nonexistent physical access security anyway; at this point the only sane mitigation is a chassis intrusion switch that wipes keys and powers down.
now I wanna see a competition at the next blackhat/whatever other security conference to open cases without triggering chassis intrusion switches
That would be tons of fun. Especially if people get to submit their own booby-trapped/customized cases.
Physical access is itself non-trivial. Actual consequences.
sure, I'm thinking of e.g. law-enforcement seizure
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