phc-discussions - Re: [PHC] How important is salting really?

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Message-ID: <1638468854.290144.1418456033965.JavaMail.open-xchange@oxuslxltgw11.lxa.perfora.net>
Date: Sat, 13 Dec 2014 01:33:53 -0600 (CST)
From: Steve Thomas <steve@...tu.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] How important is salting really?

> On December 12, 2014 at 11:19 PM Ben Harris <ben@...rr.is> wrote:
> 
>  On 13 December 2014 at 11:00, Steve Thomas <steve@...tu.com
> <mailto:steve@...tu.com> > wrote:
>    > > 
> >    P.S. MD5("deliciously-salty-" || pw) is from an infamous article that
> > gets salt
> >    wrong :). It's near the top of Google when searching for rainbow tables.
> >  >   
>  Joking aside, if you have a unique "deliciously-salty-", truncate the MD5 to
> 24 bits, and implement a good rate limiting system you'd probably have a
> pretty secure system. Good enough against online attacks, but not so good that
> you are giving up someone's password if you leak hashes. [weak passwords are
> still weak, and leaks from multiple sources for the same UID would eventually
> give up a password]
> 

Wait, I don't even know why I argued that way. I can't think of one case where a
severely truncated hash equals more security. Oh wait does my keyboard have a
breathalyzer—nope.