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Date: Mon, 07 Sep 2015 10:39:23 +0000
From: Jean-Philippe Aumasson <>
To: Dmitry Khovratovich <>,
Subject: Re: [PHC] Interest in specification of modular crypt format

Definitely needed. Any help welcome :-)

@Dmitry: were you planning to add this to the A2 specs?

On Sun 6 Sep 2015 at 20:40 Thomas Pornin <> wrote:

> On Sun, Sep 06, 2015 at 05:20:10PM +0100, Hugo Landau wrote:
> > Now that a winner has been announced, I wondered if the PHC has any
> > interest in specifying a modular crypt format to supplement the final
> > specification for Argon2?
> My opinion is that such a specification should really exist, and,
> preferably, be included right into the "official specification" (maybe
> as an appendix) and into the reference implementation(s) as well.
> Lack of a definite, standard format indeed always leads to a plethora
> of incompatible formats that cause severe headaches down the line
> (e.g. when switching implementations but reusing an existing database
> of hashed passwords).
> If the Argon2 authors do not have time for that, I can contribute the
> specification and code if needed (I have not written anything to that
> effect yet for Argon2, but I did for Makwa, so I believe I can do that
> job properly).
>         --Thomas Pornin

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