Nancy  Awadallah Awad, 
    Data Security between Challenges and Solutions: Cryptography as a Solution in
Cloud Computing,
    Journal of Engineering and Applied Sciences,
    Volume 14,Issue 15,
    2019,
    Pages 5250-5257,
    ISSN 1816-949x,
    jeasci.2019.5250.5257,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2019.5250.5257)
    Abstract: The benefits of cloud storage which are cost efficiency, resilience, scalability and data high reliability,
due to that all data firms is moving to the cloud that are easy to access from anyplace, anyhow, anytime.
Therefore, the need to protect data has become a necessity against denial of services, unauthorized users and
access. The security and trust issues are still challenges in cloud computing field which should be solved,
secure the storage databases hosted by the cloud provider, the user’s data has to be released to the cloud and
thus, leaves the protection-sphere of the data owner. This study focuses on various threats which are
considered challenges for cloud computing and presents cryptography as a data security solution in cloud
computing. Also, this study presents a framework of a hybrid cryptography algorithm through using DES and
RSA for encryption and decryption phases sequentially.
    Keywords: Cloud computing;data protection;cloud service provider;cryptography;DES;RSA