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Date: Sat, 24 Mar 2012 09:42:10 -0600
From: RB <>
Subject: Re: Research ideas.

On Fri, Mar 23, 2012 at 18:54, Solar Designer <> wrote:
>> Blowfish ($2) on a GPU.
> It is currently believed that Blowfish can't be implemented on current
> GPUs efficiently.  That said, if Lukas or anyone manages to disprove
> this, that would be even more valuable as it may affect the design of
> future KDFs.

Even if inefficient, surely it could be faster?  I know GPUs aren't
magically faster than CPUs, only better suited for particular
workloads, but that's completely fascinating.

> Are you saying that benchmark gives you 2k c/s, but actual run only
> 100 c/s?  Is that for bcrypt or for RAR?  Anyway, this is best discussed
> on its own thread.

Absolutely, and I'll be happy to discuss it in another thread.

>> Beyond that, more container formats are always welcome, it's been nice
>> to see JtR adding the various pieces of functionality we used to have
>> to go elsewhere for - zip, pdf, etc.  Perhaps Truecrypt or some of the
>> password lockers like KeePass or Password Safe.  7-zip as well, I'd
>> love to see them all here one day.
> Are you asking that we support more of these (which Dhiru has been
> working on) or that we add GPU support for some of those that we already
> support (a suggestion for Lukas' work)?

I hadn't been paying close enough attention to Dhiru's work so wasn't
aware he was already working on some of those.  For those that can be
readily implemented on the GPU (those that exercise an actual hash?)
and don't intersect Dhiru's work, I'd still be interested.  The
FileVault (versions 1 and 2) suggestion is very interesting, as would
perhaps be LUKS.

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