Luong, Tran Thi, Trương Minh Phuong, Nguyen Van Long, and Nguyen Nam Khanh. “Enhancing SPN Ciphers: Dynamic Substitution-Key Addition Layers via Binary Block Circulant Matrices”. Journal of Science and Technology on Information security 1, no. 24 (June 30, 2025): 12-29. Accessed September 29, 2025. https://isj.vn/index.php/journal_STIS/article/view/1100.