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Date:	Tue, 15 Oct 2013 17:01:29 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Cc:	starlight DOT 2013z3 AT binnacle DOT cx
Subject:	Re: /dev/random does not block, emits poor entropy
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On Oct 15 10:19, starlight DOT 2013z3 AT binnacle DOT cx wrote:
> Hardware RNG marketing is deceiving
> when it talks about "true" RNG since
> even quantum-effect number generators
> have non-random patterns that must
> be algorithmically cleansed.
> Rather than a "true" RNG or TRNG, one
> wants as CSPRNG (cryptographically
> secure pseudorandom number generator)
> that combines a good source of hardware
> entropy and appropriate purifying
> algorithms.

The Windows RtlGenRandom (the underlying implementation of
CryptGenRandom which Cygwin will use from now on)  already is a CSPRNG.
It's sort of reassuring that it already shows pretty good results when
used in the simple /dev/urandom form, given the latest NIST/NSA
entanglements.  This is on Vista SP1 and later.  The implementation on
older systems is somewhat weaker.

> People get quite hot about the topic,
> and apparently the Dilbert cartoon
> applies at all times, regardless:
>=20
> http://dilbert.com/strips/comic/2001-10-25/

:)


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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