 Voltage attack breaks crypto
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Conundrum
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Wed Apr 28 2010, 05:57PM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
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um.. guys.. Chip&Pin is now toast 
whats more amusing is that i was discussing this on 4hv chat not so long ago, even wrote down a possible attack mechanism but never published for obvious reasons.
Wonder how you would defend against this sort of hack, internal brown out lockout on the silicon maybe?
(requires full restart to enable chip again) but that would require a redesign of the chip and expensive mask rework.
Interestingly, in the "old days" you used to be able to read back protected memory on the 80Cxx series by using undocumented instructions, that got fixed pretty fast.
same sort of issue with the Intel Pentium (remember the F00F bug?) and i'm sure there are many others.
Unfortunately the usual "failsafe" mechanisms such as encapsulating the chip in reactive resin that corrodes the chip on exposure to light and oxygen don't work against this attack.
-A
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