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Meet-in-the-Middle Attack on Reduced Versions of the Camellia Block Cipher

Abstract : The Camellia block cipher has a 128-bit block length and a user key of 128, 192 or 256 bits long, which employs a total of 18 rounds for a 128-bit key and 24 rounds for a 192 or 256-bit key. It is a Japanese CRYPTREC-recommended e-government cipher, a European NESSIE selected cipher, and an ISO international standard. In this paper, we describe a few 5 and 6-round properties of Camellia and finally use them to give meet-in-the-middle attacks on 10-round Camellia under 128 key bits, 11-round Camellia under 192 key bits and 12-round Camellia under 256 key bits, all of which include the FL/FL −1 functions but do not include whitening operations.
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https://hal.inria.fr/hal-01094330
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Jiqiang Lu, Yongshuang Wei, Enes Pasalic, Pierre-Alain Fouque. Meet-in-the-Middle Attack on Reduced Versions of the Camellia Block Cipher. Advances in Information and Computer Security - 7th International Workshop on Security, 2012, Nov 2012, Fukuoka, Japan. pp.18, ⟨10.1007/978-3-642-34117-5_13⟩. ⟨hal-01094330⟩

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