Re: Why does reading from /dev/urandom deplete entropy so much?
[Posted December 12, 2007 by jake]
| From: |
| Alan Cox <alan-AT-lxorguk.ukuu.org.uk> |
| To: |
| "Ray Lee" <ray-AT-madrabbit.org> |
| Subject: |
| Re: Why does reading from /dev/urandom deplete entropy so much? |
| Date: |
| Tue, 4 Dec 2007 16:55:02 +0000 |
| Message-ID: |
| <20071204165502.0a8f695e@the-village.bc.nu> |
| Cc: |
| "Adrian Bunk" <bunk-AT-kernel.org>, "Matt Mackall" <mpm-AT-selenic.com>,
"Marc Haber" <mh+linux-kernel-AT-zugschlus.de>,
linux-kernel-AT-vger.kernel.org |
| Archive-link: |
| Article,
Thread
|
> cryptographically strong stream it'll provide when /dev/random is
> tapped? In principle, this'd leave more entropy available for
> applications that really need it, especially on platforms that don't
> generate a lot of entropy in the first place (servers).
As reported about a month ago, the evidence is that the /dev/random
stream is not cryptographically strong. Collecting uuids generated from
the kernel uuid random generator from the random generator in the kernel
shows abnormal patterns of duplicates.
Alan
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