[Cryptech Tech] RTC on Alpha

[Basil Dolmatov]

dol@ с iPad

> 1 февр. 2016 г., в 21:24, Warren Kumari <warren at kumari.net> написал(а):
> 
> 
> 
>> 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? 
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
>>  
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