Development of a Web-Based TOEFL E-Certificate System with QR Code Verification and AES–SHA-256 Security Framework. Journal of Information Systems and Technology, [S. l.], v. 2, n. 1, p. 58–73, 2026. DOI: 10.64845/jistech.v2i1.316. Disponível em: https://athallahpublishing.com/index.php/jistech/article/view/316. Acesso em: 19 may. 2026.