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Differential Cryptanalysis of Round-Reduced PRINTcipher: Computing Roots of Permutations

  • Mohamed Ahmed Abdelraheem
  • Gregor Leander
  • Erik Zenner
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6733)

Abstract

At CHES 2010, the new block cipher PRINTcipher was presented. In addition to using an xor round key as is common practice for round-based block ciphers, PRINTcipher also uses key-dependent permutations. While this seems to make differential cryptanalysis difficult due to the unknown bit permutations, we show in this paper that this is not the case. We present two differential attacks that successfully break about half of the rounds of PRINTcipher, thereby giving the first cryptanalytic result on the cipher.

In addition, one of the attacks is of independent interest, since it uses a mechanism to compute roots of permutations. If an attacker knows the many-round permutation π r, the algorithm can be used to compute the underlying single-round permutation π. This technique is thus relevant for all iterative ciphers that deploy key-dependent permutations. In the case of PRINTcipher, it can be used to show that the linear layer adds little to the security against differential attacks.

Keywords

symmetric cryptography block cipher differential cryptanalysis permutations 

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Copyright information

© International Association for Cryptologic Research 2011

Authors and Affiliations

  • Mohamed Ahmed Abdelraheem
    • 1
  • Gregor Leander
    • 1
  • Erik Zenner
    • 1
  1. 1.Technical University of DenmarkKgs. LyngbyDenmark

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