From: "David Schwartz" <davids@webmaster.com>
To: "Bernard Normier" <bernard@zeroc.com>
Cc: <jonathan@jonmasters.org>, <linux-kernel@vger.kernel.org>
Subject: RE: Concurrent access to /dev/urandom
Date: Mon, 29 Nov 2004 18:31:50 -0800 [thread overview]
Message-ID: <MDEHLPKNGKAHNMBLJOLKAEFPACAB.davids@webmaster.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0411300041290.816@mercury.sdinet.de>
> On Mon, 29 Nov 2004, Bernard Normier wrote:
>
> >>> I use /dev/urandom to generate UUIDs by reading 16 random bytes from
> >>> /dev/urandom (very much like e2fsprogs' libuuid).
> >>
> >> Why not use /dev/random for such data instead?
> >
> > A UUID generator that blocks from time to time waiting for
> entropy would not
> > be usable.
>
> Especially when used on a box without any effective entropy source - like
> praktically most cheap servers stashed away into some rack.
Assuming most of your cheap servers are running some version of the Intel
Pentium or comparable, they have wonderful entropy sources. Nobody can
predict the oscillator offset between the crystals in the network cards on
both ends and the TSC. This entropy source is mined by the kernel.
DS
next prev parent reply other threads:[~2004-11-30 2:38 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-27 20:45 Bernard Normier
2004-11-27 20:56 ` Jan Engelhardt
2004-11-27 21:15 ` Bernard Normier
2004-11-27 21:22 ` Jan Engelhardt
2004-11-28 20:58 ` Bernard Normier
2004-12-07 23:41 ` Bernard Normier
2004-12-08 1:28 ` Theodore Ts'o
2004-12-08 1:56 ` Bernard Normier
2004-12-08 19:21 ` Theodore Ts'o
2004-12-08 20:15 ` Bernard Normier
2004-12-08 21:56 ` Matt Mackall
2004-12-09 1:57 ` Theodore Ts'o
2004-12-09 2:46 ` andyliu
2004-12-09 4:55 ` Matt Mackall
2004-12-09 2:58 ` Matt Mackall
2004-12-09 21:29 ` Matt Mackall
2004-12-10 4:47 ` Matt Mackall
2004-12-10 16:35 ` Theodore Ts'o
2004-12-10 18:28 ` Matt Mackall
2004-12-10 21:28 ` Theodore Ts'o
2004-12-10 22:23 ` Matt Mackall
2004-12-11 0:22 ` Adam Heath
2004-12-11 1:10 ` Matt Mackall
2004-12-11 17:33 ` Theodore Ts'o
2004-12-11 19:58 ` Adam Heath
2004-12-11 20:40 ` Matt Mackall
2004-12-12 16:19 ` Pavel Machek
2004-12-11 0:19 ` Adam Heath
2004-12-09 3:10 ` David Lang
2004-12-09 4:52 ` Matt Mackall
2004-12-09 6:36 ` Theodore Ts'o
2004-11-29 22:47 ` Jon Masters
2004-11-29 23:14 ` Bernard Normier
2004-11-29 23:43 ` Sven-Haegar Koch
2004-11-30 2:31 ` David Schwartz [this message]
2004-11-30 4:14 ` Kyle Moffett
2004-11-30 8:23 ` Jan Engelhardt
2004-11-30 18:50 ` David Schwartz
2004-11-29 23:42 ` David Wagner
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=MDEHLPKNGKAHNMBLJOLKAEFPACAB.davids@webmaster.com \
--to=davids@webmaster.com \
--cc=bernard@zeroc.com \
--cc=jonathan@jonmasters.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome