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> 1 февр. 2016 г., в 21:24, Warren Kumari <[email protected]> написал(а): > > > >> On Mon, Feb 1, 2016 at 1:07 PM Fredrik Thulin <[email protected]> wrote: >> Hi >> >> The suggestion has been made to remove the external RTC chip currently on >> the Alpha schematics, and instead just rely on the RTC inside the ARM. >> >> The end of the discussion last time was Basil asking which chip was more >> likely to be possible to tamper with. I think the answer is "they are both >> pretty easy to tamper with if you have code execution privileges in the ARM". > > Probably a stupid idea, but what about using *both*? If the time between the > 2 RTCs is >N, assume some shenanigans? What for? What is threat model and adversary model? We can evaluate the necessity of any countermeasures only against well-defined threat model. > Based on how quickly RTCs seems to drift, this may end up with lots of false > positives though.... > > W > > >> >> OK to remove external chip? The internal RTC is likely easier to interface >> with, so it saves us engineering time. >> >> /Fredrik >> >> _______________________________________________ >> Tech mailing list >> [email protected] >> https://lists.cryptech.is/listinfo/tech > _______________________________________________ > Tech mailing list > [email protected] > https://lists.cryptech.is/listinfo/tech
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