J Cryptol https://doi.org/10.1007/s00145-018-9297-9 Colin Chaigneau UVSQ, Versailles, France Colin.Chaigneau@uvsq.fr Thomas Fuhr ANSSI Crypto Lab, Paris 07 SP, France Thomas.Fuhr@ssi.gouv.fr Henri Gilbert UVSQ, Versailles, France ANSSI Crypto Lab, Paris 07 SP, France Henri.Gilbert@ssi.gouv.fr Jérémy Jean · Jean-René Reinhard ANSSI Crypto Lab, Paris 07 SP, France Jean.Jeremy@gmail.com; Jeremy.Jean@ssi.gouv.fr Jean-Rene.Reinhard@ssi.gouv.fr Communicated by Vincent Rijmen. Received 4 October 2017 / Revised 25 April 2018 Abstract. NORX is an authenticated encryption scheme with associated data that was selected, along with 14 other primitives, for the third phase of the ongoing CAESAR competition. It is based on the sponge construction and relies on a simple permutation that allows efﬁcient and versatile implementations. Thanks to research on the security of the sponge construction, the design of NORX, whose permutation is inspired from the permutations used in BLAKE and ChaCha, has evolved throughout three main versions (v1.0, v2.0 and v3.0). The main result of this paper is a cryptanalysis of the fullNORX v2.0 that successfully passed, in 2016, the second round of the CAESAR competition. We exhibit a strong symmetry preservation property of the underlying sponge permutation and show that this property can be turned into an attack on the full primitive. This attack 66 130 yields
Journal of Cryptology – Springer Journals
Published: Jun 6, 2018
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