[147863] in cryptography@c2.net mail archive
Re: [Cryptography] provisioning a seed for /dev/urandom
daemon@ATHENA.MIT.EDU (=?UTF-8?Q?Lodewijk_andr=C3=A9_de_l)
Mon Oct 28 13:40:51 2013
X-Original-To: cryptography@metzdowd.com
In-Reply-To: <526CBAA7.8020309@echeque.com>
From: =?UTF-8?Q?Lodewijk_andr=C3=A9_de_la_porte?= <l@odewijk.nl>
Date: Mon, 28 Oct 2013 01:19:45 +0100
To: "jamesd@echeque.com" <jamesd@echeque.com>
Cc: cryptography <cryptography@metzdowd.com>
Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com
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2013/10/27 James A. Donald <jamesd@echeque.com>
> Every interrupt should provide at least one bit of entropy. There should
> be a lot more than 128 interrupts before the hypervisor gets running.
I really want a formal definition of "bit of entropy". The ways it's being
used here just don't "add up". Aren't interrupts (especially at
startup) *pretty
predictable*? Depending on the software, hardware, etc. I'd say you could
completely simulate them! (Environment factors ruin the fun, but that still
leaves interrupts as "water in the wine")
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<div dir=3D"ltr"><div class=3D"gmail_extra">2013/10/27 James A. Donald <spa=
n dir=3D"ltr"><<a href=3D"mailto:jamesd@echeque.com" target=3D"_blank">j=
amesd@echeque.com</a>></span><br><div class=3D"gmail_quote"><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex">
Every interrupt should provide at least one bit of entropy. =C2=A0There sho=
uld be a lot more than 128 interrupts before the hypervisor gets running.</=
blockquote></div><br>I really want a formal definition of "bit of entr=
opy". The ways it's being used here just don't "add up&qu=
ot;. Aren't interrupts (especially at startup) <i>pretty predictable</i=
>? Depending on the software, hardware, etc. I'd say you could complete=
ly simulate them! (Environment factors ruin the fun, but that still leaves =
interrupts as "water in the wine")</div>
</div>
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