Xu, Zhichao, Hong Xu, Lin Tan, and Wenfeng Qi. “Differential-Linear Cryptanalysis of Reduced Round ChaCha”.
IACR Transactions on Symmetric Cryptology 2024, no. 2 (June 18, 2024): 166–189. Accessed May 22, 2025.
https://tosc.iacr.org/index.php/ToSC/article/view/11626.