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

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From: Theodore Tso <tytso@...>
To: Matt Mackall <mpm@...>
Cc: Jon Masters <jonathan@...>, Mike McGrath <mmcgrath@...>, Alan Cox <alan@...>, Ray Lee <ray@...>, Adrian Bunk <bunk@...>, Marc Haber <mh+linux-kernel@...>, <linux-kernel@...>
Subject: Re: Why does reading from /dev/urandom deplete entropy so much?
Date: Saturday, December 8, 2007 - 2:05 pm

On Sat, Dec 08, 2007 at 11:43:43AM -0600, Matt Mackall wrote:

True, but for many machines, the MAC address is enough for someone
knowledgeable to (at least) determine what the manufacturer of your
machine is, and in many cases, the model number of your laptop (since
MAC addresses are assigned sequentially) and thus people can have a
very good idea of the contents of your PCI tree ---- if for some
reason anyone would even care, of course!

					- Ted
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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)