المجلة الدولية للعلوم والتقنية

In the Cloud Computing environment, it becomes an essential issue to protect and secure data. Since data is located in different places, its privacy and security means becoming the two main factors of user’s concern. However, Cloud Computing is promising and efficient; there are many challenges for data security that should be considered by the cloud user. This paper illustrates these challenges, the strategies followed to secure data and the techniques used to protect data transmission over the cloud. In addition to that, Mobile Cloud Computing Issues will be considered too.