, S. S. D. P. B. E-CAPTCHA: A Two Way Graphical Password based Hard AI Problem. International Journal on Recent and Innovation Trends in Computing and Communication, [S. l.], v. 5, n. 6, p. 418 –, 2017. DOI: 10.17762/ijritcc.v5i6.788. Disponível em: https://ijritcc.org/index.php/ijritcc/article/view/788. Acesso em: 9 may. 2024.