Elimar Ximenes, Emerson Tomaz, and Allysson Araújo. 2025. Strengthening Privacy in Virtual Private Network Authentication: A Research Proposal Exploring Blockchain and Zero-Knowledge Proofs. In Companion Proceedings of the 21st Brazilian Symposium on Information Systems, May 19, 2025, Recife/PE, Brasil. SBC, Porto Alegre, Brasil, 373-378. DOI: https://doi.org/10.5753/sbsi_estendido.2025.246832.