Security quotes of the week
Posted Oct 3, 2013 18:59 UTC (Thu) by nybble41 (subscriber, #55106)
Posted Oct 7, 2013 10:47 UTC (Mon) by etienne (guest, #25256)
If the secure key is stored, it can be read back - maybe using a complete different channel (external bus emulator), "they" won't even need to guess the 4 digits unlock code...
Posted Oct 7, 2013 14:52 UTC (Mon) by nybble41 (subscriber, #55106)
TPM chips are specifically designed to protect their secure memory from external access. There is no interface to read back the key; it is generated and used entirely within the TPM.
Sure, with unlimited physical access and the proper tools (like an electron microscope) you might be able to read the key from the raw silicon, or a defect in the implementation of the TPM could leak the key through changes in timing or power consumption. Either way you'd need to fully disassemble the device and employ tools rather more sophisticated than a mere external bus emulator.
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