DEWI, Ratna; SARI, Putri Kartika. The Improvement of Flip (2,2) Visual Cryptography Images Using Two Key Images. ComTech: Computer, Mathematics and Engineering Applications, [S. l.], v. 7, n. 3, p. 213–223, 2016. DOI: 10.21512/comtech.v7i3.2501. Disponível em: https://journal.binus.ac.id/index.php/comtech/article/view/2501. Acesso em: 7 jul. 2025.