METAPUF A Challenge Response Pair Generator. Periodicals of Engineering and Natural Sciences, [S. l.], v. 6, n. 2, 2018. DOI: 10.21533/pen.v6.i2.1720. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/1720. Acesso em: 13 jun. 2026.