International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Did Filiol Break AES ?

Nicolas T. Courtois
Robert T. Johnson
Pascal Junod
Thomas Pornin
Michael Scott
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Abstract: On January 8th 2003, Eric Filiol published on the eprint a paper ( in which he claims that AES can be broken by a very simple and very fast ciphertext-only attack. If such an attack existed, it would be the biggest discovery in code-breaking since some 10 or more years. Unfortunately the result is very hard to believe. In this paper we present the results of computer simulations done by several independent people, with independently written code. Nobody has confirmed a single anomaly in AES, even for much weaker versions of the bias claimed by the author. We also studied the source code provided by the author to realize that the first version had various issues and bugs, and the latest version still does not confirm the claimed result on AES.
  title={Did Filiol Break AES ?},
  booktitle={IACR Eprint archive},
  keywords={secret-key cryptography / block ciphers, AES, boolean functions, linear cryptanalysis, ciphertext-only attacks, stream ciphers},
  note={ 12255 received 4 Feb 2003, last revised 22 Jul 2003},
  author={Nicolas T. Courtois and Robert T. Johnson and Pascal Junod and Thomas Pornin and Michael Scott},