[cryptography] Enranda: 4MB/s Userspace TRNG

Krisztián Pintér pinterkr at gmail.com
Fri May 29 05:22:22 EDT 2015


On Fri, May 29, 2015 at 12:25 AM, Russell Leidich <pkejjy at gmail.com> wrote:
> I'm the first to admit that I don't understand where the entropy is coming
> from.

knowing where the entropy is coming from and knowing the amount of
entropy is the same thing. it is because we don't have a way to
measure entropy. we can only infer the amount from theoretical models.
the output of RC4 (or any other stream cipher) appears totally random
for any practical analysis if you don't know the key. therefore this
sentence:

>I was actually surprised how uncompressible the timedelta stream

does not make any sense. the result of a complex recursive chaotic
calculation always appears uncompressible, unless you know the proper
underlying model. trying to compress it only puts an upper limit on
entropy, but never an estimation, let alone lower bound.

> 4MB/s is the entropy rate from the internal perspective of Enranda. But in
> any event, for the record, I agree with Krisztian Pinter's statement "B" if
> you replace "CPU" with "complete computer system".

can we expect some corrections on the website then?


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