| From: | Doug McNaught <doug(at)wireboard(dot)com> |
|---|---|
| To: | Allan Engelhardt <allane(at)cybaea(dot)com> |
| Cc: | Bruno Wolff III <bruno(at)wolff(dot)to>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Re: Still wondering about random numbers... |
| Date: | 2001-08-08 03:15:14 |
| Message-ID: | m3ae1bjl8d.fsf@belphigor.mcnaught.org |
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| Lists: | pgsql-general pgsql-patches |
Allan Engelhardt <allane(at)cybaea(dot)com> writes:
> On other motherboards, reading from /dev/random can stall
> indefinitely. This is not a Good Thing. /dev/urandom is fine, but
> not rally better than rand(3) or random(3).
Wrong; it's still a lot better, especially if you have a reasonable
amount of entropy coming in--/dev/urandom uses the same entropy pool
as /dev/random and generates its data using a cryptographically secure
hash function. This is still a lot better (for crypto purposes) than
the simple LCGs used in the standard C library functions.
See the random(4) manpage on your Linux system for more details.
-Doug
--
Free Dmitry Sklyarov!
http://www.freesklyarov.org/
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