Evaluation of New Models of Data Security in Cloud Computing

Cloud computing is a processing model that has been of interest to researchers for reasons of flexibility, rapid deployment and low cost and also provides shared use of services in a network environment without the need to the ownership right and direct management of resource. Due to the storage and retrieving data of cloud services users, data security is one of the major challenges of the cloud computing. Several data security models in the cloud have been proposed to deal with these challenges, which we have evaluated some of them. The results of evaluations show that the combined data security model has the most security when the data in addition to encryption is also classified and indexed. Also the level- based model tries to secure the data in the cloud by data division into two levels and double authentication. The data security Business model with attention to the independent activity of cloud services, has also lower overhead than other data security models.