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> Thank you for your very interesting informations. Thank you for your forum :) > The user can't change the key, it's up to the guy who wrote the operating system to choose one, because the eight security bytes correspond to four interrupt vectors. At least if the interrupts are in use. I can't give you the keys of the C-Control due to legal issues. Maybe you can ask the person who wrote the operating system of the 68HC908-based C-Controls. You already discussed with him: It's DIE HARD. I understand that you don't want to give the key and I wouldn't even ask for it. What I need to know is if the CM 2020 has the same key as C-Control. Maybe DIE HARD can answer this question? > Yes, I already noticed that the code is time-constant. But the power trace attack sounds quite interesting. Even so the change in supply current must be very small and execution of these 5 cycles take only two microseconds. I'd like to know if a attack is possible that way. Yes, the power analysis is actually much safer than a glitch attack because it is passive. Glitching a chip in-circuit is not the safest thing one can do. I'm quite convinced that the DPA would work, especially if you use the right tools. Besides, you can usually slow down the chip to a point where it's easy to follow what it's doing. Best regards, TeK |
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