Guo, Zhiyuan, Renzhang Liu, Si Gao, Wenling Wu, and Dongdai Lin. 2017. “Direct Construction of Optimal Rotational-XOR Diffusion Primitives”. IACR Transactions on Symmetric Cryptology 2017 (4):169-87. https://doi.org/10.13154/tosc.v2017.i4.169-187.