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UID:7595@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20170323T110000
DTEND;TZID=Europe/Paris:20170323T120000
DTSTAMP:20241120T204419Z
URL:https://www.i2m.univ-amu.fr/evenements/innovations-in-permutation-base
 d-encryption-and-or-authentication-reporte/
SUMMARY:Joan Daemen (Radboud University Nijmegen): Innovations in permutati
 on-based encryption and/or authentication (REPORTÉ)
DESCRIPTION:Joan Daemen: Imagine there's no block ciphers\, it's easy if yo
 u try:-)\n\nThe SHA-3 competition has revealed that a fixed-length permuta
 tion is an excellent building block for hashing by means of the sponge. By
  including a key in the input this can readily be used for message authent
 ication (MAC) and by exploiting the arbitrarily long sponge output for str
 eam encryption. The duplex variant of sponge widens the spectrum to\, amon
 g other\, authenticated encryption and reseedable pseudorandom generation.
 \n\nUp to a few years ago\, it was widely believed that\, for the same lev
 el of security\, block-cipher-based modes would be more efficient than per
 mutation-based modes. This picture has recently changed thanks to new stro
 ng generic security bounds for a keyed duplex variant that allows full-sta
 te absorbing. However\, the sponge/duplex modes have the disadvantage that
  they are inherently serial and exploiting parallelism requires building a
 n additional mode layer on top. We address this concern with Farfalle\, a 
 new construction that is a parallel keyed sponge variant. Its structure st
 rongly relaxes the cryptographic requirements for the underlying permutati
 on in comparison with keyed sponge or Even-Mansour and hence it has great 
 potential for high-speed crypto. Farfalle builds a pseudorandom function (
 PRF) with arbitrary-length input and output that can readily be used for s
 tream encryption and MAC. We realize session-based authenticated encryptio
 n\, synthentic IV authentication encryption and a wide block cipher by the
  application of some amazingly simple PRF-based modes. In the talk\, I wil
 l give an overview of these recent innovations in permutation-based crypto
 .\n\nAll this is joint work with Guido Bertoni\, Michaël Peeters\, Gilles
  Van Assche and Ronny Van Keer.\n\n\n
ATTACH;FMTTYPE=image/jpeg:https://www.i2m.univ-amu.fr/wp-content/uploads/2
 020/01/Joan_Daemen.jpg
CATEGORIES:Séminaire,Arithmétique et Théorie de l’Information
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