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Extending the quasidifferential framework: from fixed-key to expected differential probability Permalink

Published in IACR Transactions on Symmetric Cryptology, 2025

In this paper, we extend the quasidifferential framework from Beyne and Rijmen to the related-key setting. Furthermore, we also extend it to compute the EDP of a characteristic. We also propose some practical modeling of those extensions and apply them on SKINNY and the AES.

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SPEEDY: Caught at Last Permalink

Published in Asiacrypt 2025, 2025

We propose the first valid (differential) attack on SPEEDY-7-192 with a time complexity of \(2^{186.36}\). The search of the differential is achievied by chaining one round characteristics whom we selected based on criterias on their shape. The validity of the characteristics (and thereby of the differential) is verified using the quasidiffeential framework. Finally, we searched for the best probabilistically-extended differential and finalized the attack using the KyRiDi tool.

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