Banik, S., F. Balli, F. Regazzoni, and S. Vaudenay. “Swap and Rotate: Lightweight Linear Layers for SPN-Based Blockciphers”. IACR Transactions on Symmetric Cryptology, vol. 2020, no. 1, May 2020, pp. 185-32, doi:10.13154/tosc.v2020.i1.185-232.