Security of data in cloud is one of the major issues which acts as an obstacle in the implementation of cloud computing. Cloud storage is an important part of cloud computing, which is used to achieve the target of storing data in the cloud. This paper proposes a highly active and efficient cloud security model. The authors' cloud security model plans to keep the most critical data security in cloud computing at different levels. The different levels are: user level, cloud service provider level, third party level and network intruder level. Data is protected against all level.