Differential Attacks Against SPN: A Thorough Analysis

Anne Canteaut 1, * Joëlle Roué 1
* Auteur correspondant
Abstract : This work aims at determining when the two-round maximum expected differential probability in an SPN with an MDS diffusion layer is achieved by a differential having the fewest possible active Sboxes. This question arises from the fact that minimum-weight differentials include the best differentials for the AES and several variants. However, we exhibit some SPN for which the two-round MEDP is achieved by some differentials involving a number of active Sboxes which exceeds the branch number of the linear layer. On the other hand, we also prove that, for some particular families of Sboxes, the two-round MEDP is always achieved for minimum-weight differentials.
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Codes, Cryptology, and Information Security - C2SI 2015, May 2015, Rabat, Morocco. Springer, 9084, pp.45-62, 2015, Lecture Notes in Computer Science. 〈10.1007/978-3-319-18681-8_4〉
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Anne Canteaut, Joëlle Roué. Differential Attacks Against SPN: A Thorough Analysis. Codes, Cryptology, and Information Security - C2SI 2015, May 2015, Rabat, Morocco. Springer, 9084, pp.45-62, 2015, Lecture Notes in Computer Science. 〈10.1007/978-3-319-18681-8_4〉. 〈hal-01237293〉

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