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Communication Dans Un Congrès Année : 2023

Differential Meet-In-The-Middle Cryptanalysis

Résumé

In this paper we introduce the differential meet-in-the-middle framework, a new cryptanalysis technique for symmetric primitives. Our new cryptanalysis method combines techniques from both meet-in-themiddle and differential cryptanalysis. As such, the introduced technique can be seen as a way of extending meet-in-the-middle attacks and their variants but also as a new way to perform the key recovery part in differential attacks. We apply our approach to SKINNY-128-384 in the single-key model and to AES-256 in the related-key model. Our attack on SKINNY-128-384 permits to break 25 out of the 56 rounds of this variant and improves by two rounds the previous best known attacks. For AES-256 we attack 12 rounds by considering two related keys, thus outperforming the previous best related-key attack on AES-256 with only two related keys by 2 rounds.
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Dates et versions

hal-04276899 , version 1 (23-10-2023)
hal-04276899 , version 2 (09-11-2023)

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Christina Boura, Nicolas David, Patrick Derbez, Gregor Leander, María Naya-Plasencia. Differential Meet-In-The-Middle Cryptanalysis. CRYPTO 2023 - 43rd International Cryptology Conference, Aug 2023, Santa Barabara, United States. pp.240-272, ⟨10.1007/978-3-031-38548-3_9⟩. ⟨hal-04276899v2⟩
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