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A Differential-Linear Attack on 12-Round Serpent

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Progress in Cryptology - INDOCRYPT 2008 (INDOCRYPT 2008)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 5365))

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Abstract

Serpent is an SP Network block cipher submitted to the AES competition and chosen as one of its five finalists. The security of Serpent is widely acknowledged, especially as the best known attack so far is a differential-linear attack on only 11 rounds out of the 32 rounds of the cipher.

In this paper we introduce a more accurate analysis of the differential-linear attack on 11-round Serpent. The analysis involves both theoretical aspects as well as experimental results which suggest that previous attacks had overestimated complexities. Following our findings we are able to suggest an improved 11-round attack with a lower data complexity. Using the new results, we are able to devise the first known attack on 12-round Serpent.

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Author information

Authors and Affiliations

  1. Département d’Informatique, CNRS, INRIA, École Normale Supérieure, 45 rue d’Ulm, 75230, Paris, France

    Orr Dunkelman

  2. Department of Electrical Engineering ESAT/SCD-COSIC Kasteelpark, Katholieke Universiteit Leuven, Arenberg 10, B-3001, Leuven-Heverlee, Belgium

    Sebastiaan Indesteege

  3. Einstein Institute of Mathematics, Hebrew University, Jerusalem, 91904, Israel

    Nathan Keller

Authors
  1. Orr Dunkelman
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  2. Sebastiaan Indesteege
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  3. Nathan Keller
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Editor information

Editors and Affiliations

  1. Dept. of Computer Science and Engineering, Indian Institute of Technology, 721 302, Kharagpur, India

    Dipanwita Roy Chowdhury

  2. K.U. Leuven, ESAT/COSIC Kasteelpark, Arenberg 10, B-3001, Leuven-Heverlee, Belgium

    Vincent Rijmen

  3. Department of Computer Science and Engineering, Indian Institute of Technology, 721 302, Kharagpur, India

    Abhijit Das

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Dunkelman, O., Indesteege, S., Keller, N. (2008). A Differential-Linear Attack on 12-Round Serpent. In: Chowdhury, D.R., Rijmen, V., Das, A. (eds) Progress in Cryptology - INDOCRYPT 2008. INDOCRYPT 2008. Lecture Notes in Computer Science, vol 5365. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89754-5_24

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  • DOI: https://doi.org/10.1007/978-3-540-89754-5_24

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-89753-8

  • Online ISBN: 978-3-540-89754-5

  • eBook Packages: Computer ScienceComputer Science (R0)

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