[Cryptech Tech] Noise board on Novena

[Joachim Strömbergson]

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Aloha!

Fredrik Thulin wrote:
> In an open design, there will always be the possibility for those
> with enough know-how to rip something out or plug something new in.
> 
> The needed know-how is significant if we are talking about making an
> entropy provider FPGA core that speaks to an external entropy
> source.
> 
> If we provide FPGA entropy providers who can talk one or more of
> these rather standard interface protocols with external entropy
> sources, that would be caring for a lot of people not capable of
> writing FPGA cores. Just sayin.

Ok. That I can agree with, good point actually.

The problem I see that the entropy provider module must always be
adapted to the external entropy source and then you could just as well
also adapt the interface being used.

If I then must suggest I would go with either UART style asynch
interface (which allow us to use a single wire) or source clocked like
SPI but allow multiple bit data. That is n data wires (1..n-1) are
expected to be stable and on the positive flank of the provided data
clock. That allows the source to have variable bit rate and easily
handled by the generic entropy provider module.

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
========================================================================
 Joachim Strömbergson          Secworks AB          joachim at secworks.se
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