[Cryptech Tech] trng ready for play

[Joachim Strömbergson]

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Aloha!

Randy Bush wrote:
> so the ROs (without the tortured transistor) take almost ten seconds
> to generate enough entropy to seed?

(I _knew_ someone would ask that questiom ;-)

No, not at all.

The rosc_entropy provider produces values at about 195 kbps. Since the
other entropy source does not provide any entropy, the rosc_entropy
provider must supply all 2048 bits needed for reseed. That is 64 words
which  should take about 10 ms.


But for 32 o of those words the collector will stall until the timeout
has been reached. This is due to the fact that the collector attempts to
get them from the enabled avalanche_entropy provider.

In the movie the timeout is set to a very long time in order for us
humans to be able to see what happens. If you would lower the timeout to
a more reasonable speed that better matches the expected time (times two
or so) for the slowest entropy provider to come up with a word, the
reseed would go much faster.

Basically what you are seeing is 32 timeouts and some sigma delay for
the rosc_entropy provider.

- -- 
Med vänlig hälsning, Yours

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