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From Distinguishers to Key Recovery: Improved Related-Key Attacks on Even-Mansour

  • Pierre Karpman
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9290)

Abstract

We show that a distinguishing attack in the related key model on an Even-Mansour block cipher can readily be converted into an extremely efficient key recovery attack. Concerned ciphers include in particular all iterated Even-Mansour schemes with independent keys. We apply this observation to the Caesar candidate Prøst-OTR and are able to recover the whole key with a number of requests linear in its size. This improves on recent forgery attacks in a similar setting.

Keywords

Even-Mansour Related-key attacks Prøst-OTR 

Notes

Acknowledgements

I am grateful to Jérémy Jean, Brice Minaud and the anonymous reviewers for their comments on this work.

Supplementary material

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.InriaSaclayFrance
  2. 2.Nanyang Technological UniversitySingaporeSingapore

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