[Cryptech Tech] User auditable hardware entropy source/random number generator

[Joachim Strömbergson]

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Aloha!

Benedikt Stockebrand wrote:
> Anyway, in my design the MCU here has two jobs: To massage the
> output from the entropy source/noise generator circuit into a proper
> random bitstream (no bias, no correlation between bits) and to pass
> it on towards the computer.  The first job must be done somewhere,
> but the second one may become irrelevant if the FPGA is receiving the
> output.

What I think Fredrik had in mind was to use a MCU to implement control
and sampling of the entropy source. The idea is to have HW-blocks in the
FPGA that contains on-line tests (subset of AIS31 is my idea at the
moment) and then any decorrelation, bias adjustment, whitening before
providing the values to the mixer.

So half of what you are thinking of putting in the MCU would go into the
FPGA. But that is not written in stone or anything. As long as the
interface provides read access to the raw data (before massaging) and an
IRQ if the on-line tests fails one could implement it all in the MCU.

- -- 
Med vänlig hälsning, Yours

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