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On the Indifferentiability of Fugue and Luffa

  • Rishiraj Bhattacharyya
  • Avradip Mandal
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6715)

Abstract

Indifferentiability is currently considered to be an important security notion for a cryptographic hash function to instantiate Random Oracles in different security proofs. In this paper, we prove indifferentiability of Fugue and Luffa, two SHA3 second round candidates. We also analyze the indifferentiability of a modified Luffa mode replacing multiple small permutations by a single large permutation.

Our technique is quite general and can be applicable to any sponge based design which uses affine function for message insertion. To the best of our knowledge, our result for Luffa is the first indifferentiability analysis of a mode of operation based on variable (more than two) number of small permutations.

Keywords

Hash function Indifferentiability Fugue Luffa 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Rishiraj Bhattacharyya
    • 1
  • Avradip Mandal
    • 2
  1. 1.Cryptology Research Group, Applied Statistics UnitIndian Statistical InstituteKolkataIndia
  2. 2.Université du LuxembourgLuxembourg

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