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Title:
A note on a recent attack against SPEEDY-7-192
Authors: Christina Boura, Patrick Derbez, Baptiste Germon, Rachelle Heim Boissier, María Naya-Plasencia
Abstract:Recently, two independent differential attacks on SPEEDY-7-192 were proposed by Boura et al. and by Beyne and Neyt. Both works present, for the first time, a valid differential attack on SPEEDY-7-192 with time complexities of 2^{186.36} and 2^{185} respectively. In this note, by extending the search space for 1-round trails, we propose a new differential attack on SPEEDY-7-192 with both data and time complexity of 2^{174.80}. This improves upon both previous attacks by more than a factor of 2^{10}.
ePrint: https://eprint.iacr.org/2025/1265
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