phc-discussions - Catena 2.0

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Date: Fri, 10 Oct 2014 17:08:01 +0200
From: Jakob Wenzel <jakob.wenzel@...-weimar.de>
To: discussions@...sword-hashing.net
Subject: Catena 2.0

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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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Download attachment "catena-v2.0.pdf" of type "application/pdf" (547434 bytes)