Xiang, Zejun, Xiangyoung Zeng, Da Lin, Zhenzhen Bao, and Shasha Zhang. “Optimizing Implementations of Linear Layers”. IACR Transactions on Symmetric Cryptology 2020, no. 2 (July 24, 2020): 120-145. Accessed August 8, 2020. https://tosc.iacr.org/index.php/ToSC/article/view/8671.