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Message-ID: <CAEw2jfzkuRrasEQXcM_sYsy8m=G_LLBk4m8w9Fgm=jLNFdvBDw@mail.gmail.com>
Date: Tue, 21 Aug 2012 16:15:23 +0200
From: Patrick Mylund Nielsen <cryptography@...rickmylund.com>
To: john-users@...ts.openwall.com
Subject: Re: Arstechnica Password article (feat. Matt Weir)
That article, IMO, wrongly implies that SRP is somehow inferior to key
derivation functions, when in fact they serve two different purposes:
protection against network eaves-dropping vs. resistance to offline attacks
on the verifiers/digests. There is no reason why Blizzard can't use a KDF
client-side with a proof like SRP for even better security.
On Tue, Aug 21, 2012 at 4:11 PM, Solar Designer <solar@...nwall.com> wrote:
> On Tue, Aug 21, 2012 at 09:36:16AM -0400, Rich Rumble wrote:
> > http://arstechnica.com/security/2012/08/passwords-under-assault/
> > Good article, no mention of Jtr :( or it's incremental and other
> > modes, rather focus on GPU cracking using HashCat mostly; some other
> > tools mentioned as well. Also I had no idea we were actually going to
> > be up against the Erebus system (http://ob-security.info/?p=546)in the
> > contest, but I guess I should of known :)
> > While I wish JtR and all it's abilities (GPU included), the article is
> > accurate as far as I can tell.
>
> There are some minor inaccuracies.
>
> Anyhow, if you post these, here's another recent article by Dan:
>
>
> http://arstechnica.com/security/2012/08/hacked-blizzard-passwords-not-hard-to-crack/
>
> which actually includes references to JtR in the SRP cracking context.
>
> For those not on john-dev: JimF has since actually implemented
> Blizzard's SRP cracking in JtR - and we're getting speeds up to about
> 400k c/s per CPU chip - but we have yet to see any of the presumably
> leaked SRP verifiers, so we don't know if the code would work on them
> as-is or would need some additional tweaking. On FX-8120:
>
> Benchmarking: WoW (Battlenet) SRP sha1 [32/64 GMP-exp]... (8xOMP) DONE
> Raw: 395264 c/s real, 49408 c/s virtual
>
> Alexander
>
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