[Cryptech Tech] Noise board on Novena

[Joachim Strömbergson]

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Aloha!

Fredrik Thulin wrote:
> Bit-banging, although preferably with less than 32 parallel data
> lines, would probably be easier if we didn't have to care about other
> people, but I think we should care.
> 
> Let me hear your arguments for something else than SPI =)

I think you are skipping over the more important issue - that if we
should or if we shouldn't require a specific interface to external
entropy sources. I say that we shouldn't enforce a specific interface,
but adapt to/accept whatever interface e given entropy source requires
and its designer fancies. At least to some degree. Not so sure a GBE
interface would be very good.

This means that if _you_ want to use SPI to provide access to your
entropy source board and can provide the FPGA entropy provider module
for Cryptech that encapsulates the SPI interface then go for it. I would
rather prefer to use the single bit schmitt-triggered noise interface we
use today, but thats me.

As long as it (the entropy source and its associated entropy provider
module) can deliver entropy over the fifo-like interface and provide API
ports for control, access to raw entropy then I'm not going to complain.
Not much at least.

- -- 
Med vänlig hälsning, Yours

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