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I'm coming around to believing it's possible. Now I'm wondering whether you can place malicious RAM in the phone that changes instructions on the fly. Is that
by ikeboy 11y ago
I'm coming around to believing it's possible.
Now I'm wondering whether you can place malicious RAM in the phone that changes instructions on the fly. Is that feasible?
- codys 11y agoLots of things become possible once one is willing to decap ICs to get at the internals. I'd expect security consious parts (ie: all of the theoretical "loader A") would need to run in SRAM (ie: ram that is in the same IC and thus harder to get at than external DRAM chips) or some other mechanism. At that point, it becomes a question of physical hardening within the ICs. Some manufacturers have done things like put metal layers over fuses (to prevent them from being changed), I'd imagine the same could be done (at some cost) for a larger area of the chip. I'd imagine HSMs (hardware security modules) and TPMs (though these aren't as good) probably implement some of that. There also exist some chips targeted towards security purposes (not aware of any processors off hand) that could be used .
- ikeboy 11y agoWouldn't the regular ram also need hardening? If I can modify the ram, I can change the OS that's loaded to ram. Does this hardening slow it down?