Haryono, Wasis. “Comparison Encryption of How to Work Caesar Cipher, Hill Cipher, Blowfish and Twofish”. Data Science: Journal of Computing and Applied Informatics 4, no. 2 (July 31, 2020): 100-110. Accessed March 29, 2024. https://talenta.usu.ac.id/JoCAI/article/view/4004.