Sarkar, Sumanta, and Habeeb Syed. “Lightweight Diffusion Layer: Importance of Toeplitz Matrices”.
IACR Transactions on Symmetric Cryptology
, vol. 2016, no. 1, Dec. 2016, pp. 95-113,
https://doi.org/10.13154/tosc.v2016.i1.95-113
.