KUMAR, Vipin; BARVE, Atul. A Survey on Existing CAPTCHA Techniques and Proposed Gaming CAPTCHA for Better Security Analysis. International Journal of Computer Sciences and Engineering, [S. l.], v. 5, n. 1, p. 101–106, 2025. Disponível em: https://ijcse.isroset.org/index.php/j/article/view/1341. Acesso em: 2 feb. 2026.