On 2012-06-20 2:17 PM, David Johnston wrote:
If an entropy source in a closed system is producing an apparently non
repeating, unbiased sequence and its output is deterministic (or low
entropy) then there must be internal memory in the entropy source that
is enabling the non repeating behavior. The more memory, the longer you
have to watch before you can identify repeating behavior.
So make your entropy source have a very small amount of memory and be
sufficiently simple that you can model it mathematically. Then you can
show all the SPOF and DPOF failure modes and show that your health check
circuitry catches them.
The whitener has a very large amount of memory.
So I would prefer the entropy source to be separate and separable from
the whitener, so that it could be checked by software, not hardware.
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