Gao, Yuan, Chun Guo, Meiqin Wang, Weijia Wang, and Jiejing Wen. “Beyond-Birthday-Bound Security for 4-Round Linear Substitution-Permutation Networks”. IACR Transactions on Symmetric Cryptology 2020, no. 3 (September 28, 2020): 305–326. Accessed January 18, 2025. https://icscm.ub.rub.de/index.php/ToSC/article/view/8704.