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Re: [HACKERS] Postgres: pg_hba.conf, md5, pg_shadow, encrypted passwords
From: Jim C. Nasby (decibeldecibel.org)
Date: Wed Apr 20 2005 - 16:23:23 CDT
On Wed, Apr 20, 2005 at 05:03:18PM -0400, Tom Lane wrote:
> > This would allow for the pregeneration of the entire md5
> > keyspace using that 'salt' and then quick breakage of the hash once
> > it's retrieved by the attacker.
> Considering the size of the possible keyspace, this is pretty silly.
Actually, it's not as silly as you think. You can download rainbow
tables for Windows/LanMan passwords up to 14 or 15 characters in length.
Given the password hash and some code, you can determine the user's
password in a matter of minutes.
Simply put, MD5 is no longer strong enough for protecting secrets. It's
just too easy to brute-force. SHA1 is ok for now, but it's days are
numbered as well. I think it would be good to alter SHA1 (or something
stronger) as an alternative to MD5, and I see no reason not to use a
random salt instead of username.
Jim C. Nasby, Database Consultant decibeldecibel.org
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