Ussatova, O., Makilenov, S., Mukaddas, A., Amanzholova, S., Begimbayeva, Y. and Ussatov, N. 2023. Enhancing healthcare data security: a two-step authentication scheme with cloud technology and blockchain. Eastern-European Journal of Enterprise Technologies. 6, 2 (126) (Dec. 2023), 6–16. DOI:https://doi.org/10.15587/1729-4061.2023.289325.