M. Adnan Darwish, E. Yafi, A. H. Almasri, and M. F Zuhairi, “Privacy and Security of Cloud Computing: A Comprehensive Review of Techniques and Challenges”, IJET, vol. 7, no. 4.29, pp. 240–247, Nov. 2018, doi: 10.14419/ijet.v7i4.29.26263.