Re: [Cfrg] scrypt password-based key derivation function

Simon Josefsson <simon@josefsson.org> Fri, 11 December 2015 10:23 UTC

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From: Simon Josefsson <simon@josefsson.org>
To: Hanno =?iso-8859-1?Q?B=F6ck?= <hanno@hboeck.de>
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Date: Fri, 11 Dec 2015 11:22:59 +0100
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Subject: Re: [Cfrg] scrypt password-based key derivation function
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Hanno Böck <hanno@hboeck.de> writes:

> Hi,
>
> On Thu, 10 Dec 2015 13:19:51 +0000
> Stephen Farrell <stephen.farrell@cs.tcd.ie> wrote:
>
>> Just a heads-up that this is currently up for IESG approval
>> on the January 7th telechat. If someone had a chance to take
>> a peek in the meantime that'd be great as there were a few
>> changes and clarifications done but hopefully nothing bad:-)
>
> I see that this was originally submitted in 2012.
>
> These days we have argon2 and from what I'm aware scrypt and argon2
> have very similar goals. However argon2 is the winner of a
> competition.
>
> So is it really appropriate to still have an rfc for scrypt? It seems
> that whereever scrypt is considered to be used argon2 can replace it.
> And having more choices with almost the same goals only adds unneeded
> complexity.

At this point, publishing the scrypt document is about documenting
reality.  Scrypt is already widely deployed used on the Internet.  That
is why I believe it is useful to publish this.  I agree it is better to
promote Argon2 going forward -- and that work is in progress -- but I
believe there will be years until it reaches the same deployment level
as scrypt.  Argon2 was finalized only on the last months.

/Simon