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Date: Tue, 23 Dec 2014 11:34:21 +0800
From: Ben Harris <>
Subject: Re: [PHC] How important is salting really?

On 23 December 2014 at 11:09, epixoip <> wrote:

> To exhaust 62^8 keyspace with this
> cluser would take ~50.5 days and cost ~ $1842.24 @ $0.20/kWh. Average
> PUE in 2014 is 1.7 so actual electricity cost would be more like $3684.48.
> And that's just for a single hash. For 400k salts (which is what Sc00bz
> estimated in the comments) the effective rate with 16x 290X would only
> be about 63 H/s.
Awesome. I'm guessing you have the info to estimate the breakup between
on-dictionary, near-dictionary (candidate gen), and random passwords? Any
chance you can do some guesstimates on the other two categories for

I guess at 63 H/s you can cover the top 20K passwords in 5 and a half
minutes (for a cost of about 28c compared to the $3684.48). And hit 2^28
candidates in the same time/cost as the above example (for all the hashes
instead of just 1).

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