phc-discussions - Re: [PHC] pufferfish

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Date: Thu, 27 Mar 2014 21:35:34 -0400
From: Bill Cox <waywardgeek@...il.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] pufferfish

On Thu, Mar 27, 2014 at 9:09 PM, Bill Cox <waywardgeek@...il.com> wrote:
> On Thu, Mar 27, 2014 at 8:55 PM, Jeremi Gosney <epixoip@...dshell.nl> wrote:
>> On 3/27/2014 5:52 PM, Bill Cox wrote:
>>> On Thu, Mar 27, 2014 at 8:22 PM, Solar Designer <solar@...nwall.com> wrote:
>>>> I had actually considered revising the original bcrypt to introduce that
>>>> "outer loop", and I felt that it could be done without it appearing as
>>>> an extra loop.  bcrypt already has its 2^cost loop - that one loop could
>>>> be revised to move the 4 KiB region across a larger arena and to XOR (or
>>>> whatever) it with random 4 KiB regions in the already-written portion of
>>>> the arena.
>>>>
>>>> Alexander
>>> +1 for this solution.  That would make PufferFish competitive.
>>>
>>> Bill
>>
>>
>> Implying it's not competitive...
>
> Sorry... Even among geeks, I seem socially impaired.
>
> I like PufferFish the way it is, but as Alexander pointed out, when
> you bust out of L1 cache, performance drops.  When you bust out of L3
> into DRAM, if I read the code correctly, performance will drop a ton.
> I'd be a hypocrite for not suggesting that you take his advice and
> implement the wandering 4KiB window in the 2^cost loop.  Over half of
> my submission is built on ideas he suggested.  I just hope there can
> be some way for him to formally "win" regardless of which submission
> built on his ideas wins.
>
> I give myself credit for knowing good ideas when I see them.  The
> wandering 4KiB window seems like a winner to me.
>
> Bill

On the other hand, taking Alexander's advice is how I managed to PO my
boss and fail to sleep for more than about 4 hours a night for three
months.  PufferFish is good.

Bill