phc-discussions - Re: [PHC] Argon2 string encoding and parallelism

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Message-ID: <CAGiyFdcfgWFO8FU53udXPOvLauWUqTRCag7W2zwo0zOhierdyw@mail.gmail.com>
Date: Sun, 18 Oct 2015 17:39:26 +0000
From: Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Argon2 string encoding and parallelism

So we'll accept a same encoding for instances whose implementations has a
different structure. Unlikely to be an issue I guess.

On Sun, Oct 18, 2015 at 7:37 PM Samuel Neves <sneves@....uc.pt> wrote:

> On 18-10-2015 18:30, Jean-Philippe Aumasson wrote:
> > Just noticed that the string encoding defined by Thomas has a single
> > parallelism parameter whereas Argon2 supports distinct number of lanes
> and
> > number of threads, which can't be encoded with a single parameter. I
> don't
> > think that's a problem though, I don't see many reasons why
> implementations
> > wouldnt have #lane=#threads.
> >
>
> Number of threads is a runtime parameter that doesn't affect output, so it
> doesn't really need to be encoded; it's up to
> the system configuration/implementation to figure out what the optimal
> thread count should be. Lanes, on the other hand,
> must be there.
>

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