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    SubjectRe: Why does reading from /dev/urandom deplete entropy so much?
    On Tue, Dec 04, 2007 at 05:18:11PM +0100, Adrian Bunk wrote:
    > On Tue, Dec 04, 2007 at 12:41:25PM +0100, Marc Haber wrote:
    > > While debugging Exim4's GnuTLS interface, I recently found out that
    > > reading from /dev/urandom depletes entropy as much as reading from
    > > /dev/random would. This has somehow surprised me since I have always
    > > believed that /dev/urandom has lower quality entropy than /dev/random,
    > > but lots of it.
    >
    > man 4 random

    Thanks for this pointer, I was not aware of the documentation. After
    reading this thread and the docs, I am now convinced that GnuTLS
    should seed a PRNG from /dev/(u)random instead of using the entropy
    directly. I will go filing a bug against GnuTLS.

    Greetings
    Marc

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