[Cryptech Tech] RTC on Alpha

[Warren Kumari]

On Mon, Feb 1, 2016 at 1:07 PM Fredrik Thulin <fredrik at thulin.net> 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?
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
>
>
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