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Title:
BBB PRP Security of the Lai-Massey Mode
Authors: Ritam Bhaumik, Mohammad Amin Raeisi
Abstract:In spite of being a popular technique for designing block ciphers, Lai-Massey networks have received considerably less attention from a security analysis point-of-view than Feistel networks and Substitution-Permutation networks. In this paper we study the beyond-birthday-bound (BBB) security of Lai-Massey networks with independent random round functions against chosen-plaintext adversaries. Concretely, we show that five rounds are necessary and sufficient to achieve BBB security.
ePrint: https://eprint.iacr.org/2023/1834
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