Wei, Yongzhuang, Tao Ye, Wenling Wu, and Enes Pasalic. 2018. “Generalized Nonlinear Invariant Attack and a New Design Criterion for Round Constants”. IACR Transactions on Symmetric Cryptology 2018 (4):62-79. https://doi.org/10.13154/tosc.v2018.i4.62-79.