Maulani, Giandari, Gunawan Gunawan, Leli Leli, Efa Ayu Nabila, and Windy Yestina Sari. 2021. “Digital Certificate Authority With Blockchain Cybersecurity in Education”. International Journal of Cyber ​​and IT Service Management (IJCITSM) 1 (1):136-50. https://doi.org/10.34306/ijcitsm.v1i1.40.