phc-discussions - Re: [PHC] Catena 2.0

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Message-ID: <CAGiyFdfC=OfEd7mgdAuW9wezktuBAkm6F7mgzY08z9enq1Wzzw@mail.gmail.com>
Date: Mon, 13 Oct 2014 14:18:27 +0200
From: Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Catena 2.0

Should we update the PHC submission accordingly? if so, please send us
a revised submission package.

Thank you,



On Fri, Oct 10, 2014 at 5:08 PM, Jakob Wenzel
<jakob.wenzel@...-weimar.de> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi all,
>
> please find attached Version 2.0 of Catena. The reason why we changed
> the version number from 1.1 to 2.0 is that we had find an alternative
> to the underlying graph-based structure (lambda-bit-reversal graph)
> (due to the cryptanalysis by Dmitry and Alex [mailinglist: August 6
> 2014]).
>
> In the following you can find the changelog from Version 1.1 to
> Version 2.0:
>
>   - removed the flawed proof for $\lambda$-memory-hardness of the
>     $(G,\lambda)$-bit-reversal hashing operation
>
>   - Catena is now designated as a password-scrambling framework (PSF)
>     instead of a pure password scrambler
>
>   - introducing the name Catena-BRG: Catena instantiated with the
>     memory-hard $(G,\lambda)$-bit-reversal hashing operation
>
>   - introducing a new instance Catena-DBG: Catena instantiated with the
>     $\lambda$-memory-hard $(G,\lambda)$-double butterfly hashing
>     operation
>
>   - new recommendations for the usage of Catena-BRG and Catena-DBG
>     depending on the required memory-hardness
>
>   - set version ID to 0xFF for Catena-BRG
>   - set version ID to 0xFE for Catena-DBG
>
> The current version is also available on:
> http://www.uni-weimar.de/de/medien/professuren/mediensicherheit/research/catena/
>
> The current reference implementation is available on:
> https://github.com/cforler/catena
>
> Best regards,
> The Catena Design Team
>
>
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