Shareef, Omar Salah F., and Ali Makki Sagheer. “Using Role-Based to Implement Certificate Authority Management for Big Data”. Journal of Al-Qadisiyah for Computer Science and Mathematics 11, no. 4 (September 29, 2019): Comp Page 27– 36. Accessed November 13, 2024. https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/626.