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Message-ID: <20160710123122.GA2439@openwall.com>
Date: Sun, 10 Jul 2016 15:31:22 +0300
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: best way to attack bcrypt, for me
Rich,
On Sun, Jul 10, 2016 at 03:14:16PM +0300, Solar Designer wrote:
> There are also slightly older/smaller CPUs like "Intel Xeon E5 2670 V2
> ES 2.30GHz 25MB 22nm 115W 10 Core LGA2011 QDNR Processor" for around
> $140 from sellers in Hong Kong. These could be more cost-effective if
> you find inexpensive dual-socket motherboards and choose to build 2+
> cheaper systems.
Actually, with offers like "Intel Xeon E5 2670 V3 ES 2.2Ghz 30MB 12 Core
LGA2011-3 120W 22nm Processor CPU" for $194, it makes little sense to go
for anything older than v3 even if you build many cheaper systems.
You need v3 for AVX2, which provides almost a 2x speedup (over AVX) for
many hash types other than bcrypt. (You'll run many of those other hash
types on GPUs once you add GPUs to the system, though.) For bcrypt, v3+
is about 30% faster than v2 and older.
Alexander
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