Muhammad Usman Ashraf 2021. A Survey on Data Security in Cloud Computing Using Blockchain: Challenges, Existing-State-Of-The-Art Methods, And Future Directions. Lahore Garrison University Research Journal of Computer Science and Information Technology. 5, 3 (Sep. 2021), 15-30. DOI:https://doi.org/10.54692/lgurjcsit.2021.0503213.