Improving impossible-differential attacks against Rijndael-160 and Rijndael-224 Marine Minier To cite this version: Marine Minier. Improving impossible-differential attacks against Rijndael-160 and Rijndael-224. De- signs, Codes and Cryptography, Springer Verlag, 2017, 82 (1-2), pp.117 - 129. 10.1007/s10623-016- 0206-7. hal-01593371 HAL Id: hal-01593371 https://hal.inria.fr/hal-01593371 Submitted on 28 Nov 2017 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Improving Impossible Dierential Attacks against Rijndael-160 and Rijndael-224? Marine Minier Université de Lyon, INRIA INSA-Lyon, CITI, F-69621, Villeurbanne, France
[email protected] Abstract. Impossible dierential attacks are a very ecient form of cryptanalysis against block ciphers. In this paper, we improve the existing impossible dierential attacks against Rijndael-160 and Rijndael-224. Keywords: Rijndael, impossible dierential attack, cryptanalysis, block ciphers. 1 Introduction Impossible dierential attack introduced in [1] is a powerful cryptanalytic method against block ciphers. Classically, impossible dierential attacks take advantage of dierentials which never occur for the studied permutations. From an impos- sible dierential path, the idea is then to test if a key could verify or not the path, if yes the attacker could discard the tested key.