Zhang, Wenying, Meichun Cao, Jian Guo, and Enes Pasalic. “Improved Security Evaluation of SPN Block Ciphers and Its Applications in the Single-Key Attack on SKINNY”. IACR Transactions on Symmetric Cryptology 2019, no. 4 (January 31, 2020): 171-191. Accessed July 13, 2020. https://tosc.iacr.org/index.php/ToSC/article/view/8461.