Viet , N.Q. and Cuong, N.M. 2025. 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. 3, 26 (Dec. 2025), 39-49. DOI:https://doi.org/10.54654/isj.v3i26.1158.