VIET , N. Q.; CUONG, N. M. Proposal of an End-to-End Encrypted Chat System with Digital Signature and Vietnamese Character Support Based on Elliptic Curve. Journal of Science and Technology on Information security, [S. l.], v. 3, n. 26, p. 39-49, 2025. DOI: 10.54654/isj.v3i26.1158. Disponível em: https://isj.vn/index.php/journal_STIS/article/view/1158. Acesso em: 11 feb. 2026.