Re: Why does reading from /dev/urandom deplete entropy so much? | KernelTrap

Re: Why does reading from /dev/urandom deplete entropy so much?

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From: Marc Haber <mh+linux-kernel@...>

To: Matt Mackall <mpm@...>

Cc: Eric Dumazet <dada1@...>, Alan Cox <alan@...>, Adrian Bunk <bunk@...>, <linux-kernel@...>, David S. Miller <davem@...>

Subject: Re: Why does reading from /dev/urandom deplete entropy so much?

Date: Sunday, December 9, 2007 - 8:42 am

On Wed, Dec 05, 2007 at 03:26:47PM -0600, Matt Mackall wrote:
quoted text> The distinction between /dev/random and /dev/urandom boils down to one
> word: paranoia. If you are not paranoid enough to mistrust your
> network, then /dev/random IS NOT FOR YOU. Use /dev/urandom.

But currently, people who use /dev/urandom to obtain low-quality
entropy do a DoS for the paranoid people.

Greetings
Marc

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Messages in current thread:

Why does reading from /dev/urandom deplete entropy so much?, Marc Haber, (Tue Dec 4, 7:41 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Eric Dumazet, (Tue Dec 4, 10:16 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Adrian Bunk, (Tue Dec 4, 12:18 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Bill Davidsen, (Thu Dec 6, 3:32 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Adrian Bunk, (Sat Dec 8, 6:03 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Bill Davidsen, (Tue Dec 11, 11:42 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Marc Haber, (Thu Dec 20, 6:27 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Phillip Susi, (Wed Dec 26, 2:27 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Ismail , (Sat Dec 8, 6:10 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Sat Dec 8, 7:46 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Ismail , (Sun Dec 9, 2:21 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Sun Dec 9, 8:31 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Ismail , (Sun Dec 9, 10:06 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Willy Tarreau, (Sun Dec 9, 1:21 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Jon Masters, (Sun Dec 9, 2:52 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Ray Lee, (Tue Dec 4, 12:54 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Marc Haber, (Wed Dec 5, 8:23 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Tue Dec 4, 2:01 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Bill Davidsen, (Thu Dec 6, 4:08 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Alan Cox, (Tue Dec 4, 12:55 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Tue Dec 4, 2:02 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Tue Dec 4, 3:50 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Alan Cox, (Tue Dec 4, 4:40 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Mike McGrath, (Tue Dec 4, 4:48 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Tue Dec 4, 6:03 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Mike McGrath, (Tue Dec 4, 6:12 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Tue Dec 4, 6:28 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Tue Dec 4, 5:54 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Tue Dec 4, 5:08 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Mike McGrath, (Tue Dec 4, 5:18 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Tue Dec 4, 6:15 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Mike McGrath, (Tue Dec 4, 6:23 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Tue Dec 4, 6:33 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Mike McGrath, (Wed Dec 5, 10:26 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Wed Dec 5, 10:49 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Pavel Machek, (Mon Dec 10, 12:37 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Jon Masters, (Sat Dec 8, 3:38 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Sat Dec 8, 1:32 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Mike McGrath, (Sat Dec 8, 1:33 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Sat Dec 8, 1:49 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Jeff Garzik, (Sat Dec 8, 2:31 pm)

RE: Why does reading from /dev/urandom deplete entropy so mu..., David Schwartz, (Sat Dec 8, 4:26 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Sat Dec 8, 2:15 pm)

entropy gathering (was Re: Why does reading from /dev/urando..., Jeff Garzik, (Sat Dec 8, 3:36 pm)

Re: entropy gathering (was Re: Why does reading from /dev/ur..., Willy Tarreau, (Sat Dec 8, 4:42 pm)

Re: entropy gathering (was Re: Why does reading from /dev/ur..., Theodore Tso, (Sat Dec 8, 7:47 pm)

Re: entropy gathering (was Re: Why does reading from /dev/ur..., Jon Masters, (Sat Dec 8, 9:07 pm)

Re: entropy gathering (was Re: Why does reading from /dev/ur..., Matt Mackall, (Sat Dec 8, 3:53 pm)

Re: entropy gathering (was Re: Why does reading from /dev/ur..., Jeff Garzik, (Sat Dec 8, 4:04 pm)

Re: entropy gathering (was Re: Why does reading from /dev/ur..., Theodore Tso, (Sat Dec 8, 4:31 pm)

Re: entropy gathering (was Re: Why does reading from /dev/ur..., Jeff Garzik, (Sat Dec 8, 4:47 pm)

Re: entropy gathering (was Re: Why does reading from /dev/ur..., Matt Mackall, (Sat Dec 8, 4:19 pm)

Re: entropy gathering (was Re: Why does reading from /dev/ur..., Willy Tarreau, (Sat Dec 8, 5:07 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Sat Dec 8, 2:24 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Jon Masters, (Sat Dec 8, 1:54 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Sat Dec 8, 1:43 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Sat Dec 8, 2:05 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Jon Masters, (Sat Dec 8, 1:47 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Jon Masters, (Sat Dec 8, 1:45 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Tue Dec 4, 4:36 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Marc Haber, (Wed Dec 5, 8:29 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Wed Dec 5, 9:33 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Marc Haber, (Wed Dec 5, 11:10 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Alan Cox, (Tue Dec 4, 12:47 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Eric Dumazet, (Tue Dec 4, 2:17 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Wed Dec 5, 5:26 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Marc Haber, (Sun Dec 9, 8:42 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Sun Dec 9, 12:16 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Marc Haber, (Mon Dec 10, 7:06 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Mon Dec 10, 7:35 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Theodore Tso, (Mon Dec 10, 9:34 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Phillip Susi, (Tue Dec 11, 3:46 pm)

RE: Why does reading from /dev/urandom deplete entropy so mu..., David Schwartz, (Wed Dec 12, 1:34 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Ray Lee, (Tue Dec 11, 4:02 pm)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Eric Dumazet, (Thu Dec 6, 3:02 am)

Re: Why does reading from /dev/urandom deplete entropy so mu..., Matt Mackall, (Thu Dec 6, 12:09 pm)

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