Issues and Threats of Cloud Data Storage

Cloud Storage is a subset of Cloud Computing, a new technology that knows a hasty progress in the IT world. Indeed, many providers offer, as a service, plenty of Cloud Storage spaces, especially for mobile's use. Due to the massive use of this means of storage increase issues and threats. Thus, many efforts are dedicated by scientific and researches all over the word to avoid these risks and solve the various security problems that confront Cloud Storage. This Chapter is a modest contribution to the ongoing efforts. It will be focused on the Cloud Storage security. At first, we will try to describe the data life cycle and to giving meanwhile the security measures and methods for each cycle. Then, we will present some new approaches that protect data in Cloud. Finally, we will propose and discuss a new secure architecture based on three layers.