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Improved Attacks on Extended Generalized Feistel Networks

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Cryptology and Network Security (CANS 2016)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 10052))

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Abstract

In SAC 2013, Berger et al. defined Extended Generalized Feistel Networks (EGFN) and analyzed their security. They proposed designs with 8 or 16 branches. This class of schemes is well-suited for cryptographic applications. Using the minimal number of active S-boxes, the authors showed that for 64-bits messages divided into 8 branches, at least seven rounds are needed for security against differential and linear cyptanalysis. They proved that 10 rounds are required against integral attacks and 9 rounds against impossible differential attacks. In this paper, we propose a method that allows to attack up to 18 rounds the design with 8 branches. We also mention the results for the 16-branch design.

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Author information

Authors and Affiliations

  1. Department of Mathematics, University of Cergy-Pontoise, CNRS UMR 8088, 2 Avenue Adolphe Chauvin, 95011, Cergy-Pontoise Cedex, France

    Valérie Nachef, Nicolas Marrière & Emmanuel Volte

Authors
  1. Valérie Nachef
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  2. Nicolas Marrière
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  3. Emmanuel Volte
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Corresponding author

Correspondence to Valérie Nachef .

Editor information

Editors and Affiliations

  1. Università degli Studi di Milano, Crema, Italy

    Sara Foresti

  2. Università degli Studi di Salerno, Fisciano, Italy

    Giuseppe Persiano

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Nachef, V., Marrière, N., Volte, E. (2016). Improved Attacks on Extended Generalized Feistel Networks. In: Foresti, S., Persiano, G. (eds) Cryptology and Network Security. CANS 2016. Lecture Notes in Computer Science(), vol 10052. Springer, Cham. https://doi.org/10.1007/978-3-319-48965-0_35

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  • DOI: https://doi.org/10.1007/978-3-319-48965-0_35

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-48964-3

  • Online ISBN: 978-3-319-48965-0

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