Cillero, IvánSoler, DavidDafonte, CarlosFernández Veiga, ManuelFernández Vilas, AnaNóvoa, Francisco2026-09-102026-09-102025Cillero, I., Soler, D., Dafonte, C., Fernández-Veiga, M., Fernández-Vilas, A., & Nóvoa, F. J. (2026). Development of an Instant Messaging Application Based on MLS using QRNG-Generated Keys. In Proceedings XoveTIC 2025: Impulsando el talento científico (pp. 317-324). Servizo de Publicacións UDC. https://doi.org/10.17979/spu.23.c51978-84-9749-925-5https://hdl.handle.net/2183/49198Presentado en: VIII Congreso Xove TIC: impulsando el talento científico. Octubre, 2025, A Coruña.[Abstract] Nowadays, instant messaging applications have become the main channel of communication between people. In response to demands of privacy by users, some applications have begun to incorporate end-to-end encryption to protect conversations. The Messaging Layer Security (MLS) is a recent protocol that offers end-to-end encryption designed for groups, providing both efficiency and security. In this work we develop a messaging application that uses MLS as the basis for secure communications between users. The application will use a peer-to-peer network to prevent messages from passing through servers that could store them and try to decrypt them. Furthermore, the cryptographic keys used will be generated by a Quantum Random Number Generator and accessed through an Entropy-as-a-Service platform.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Messaging layer security (MLS)End-to-end encryptionQuantum random number generator (QRNG)Peer-to-peer networksSecure messagingconference outputopen access10.17979/spu.23.c51