phc-discussions - Re: [PHC] Catfish and public key hash

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Date: Thu, 3 Apr 2014 04:06:13 -0500 (CDT)
From: Steve Thomas <steve@...tu.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Catfish and public key hash

> On April 2, 2014 at 6:36 PM mjunior@...c.usp.br wrote:
>
>  Hi there
>
>  I would say that if the attacker needs more than 2x the amount of memory used
>by the defender to get less than a 2x speed-up, then the attacker is wasting
>resources: he/she could simply use two cores to get the same throughput...
>Unless the attacker model considers a limitation in number of cores, which does
>not seem to be the most common case.
>

But it's "free" if I have 8 GiB of ram and 4 cores and the settings are such
that I need 64 MiB/guess then I have 7.75 GiB doing nothing. Anyway this is
a non-issue if they just change it from (x is the output of Keccak):

g ** x (mod N)
to
x ** e (mod N)