[Cryptech Tech] Improving the BP entropy source

[Joachim Strömbergson]

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Aloha!

Bernd, I have a few questions regarding the BP entropy source and how I
use it. I would appreciate comments.

Right now I use it with the l-parameter i rosc.v as you had it
initially, that is set to 8. That means that we have 8 bit add with
carry as logic that drives the carry inverter. I I understood you
correctly you recommended to reduce l to 2. This would reduce logic and
should increase oscillator toggle frequency somewhat.

Currently I'm reading the n-wire to get values out, never the p-wire.
This means that the rosc-modules generating values in p are basically
unused. Would it be an advantage to mix p and n (XOR), or should I
instead for example concatenate n and p {n, p} to get a common word?

Changing l to two, increasing the genvar to instead instantiate 2*32
rosc:s and then xor the n an p vectors should be very straight forward
and yield 32 bit word where each bit is depends on two separata rosc
oscillators.

- -- 
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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