A comparative analysis on cloud data security

Cloud computing a distributed network for sharing data over internet, serves as an online data backup with scalability. The paper describes various categories of clouds depending on the usage of cloud and also on the services provided by the cloud. Data security is one of the major challenges faced by cloud providers and cloud users. Cryptography is suggested as the appropriate solution for securing the cloud data. Review on some of the existing cryptographic methods for securing the data stored in the cloud is also included in this paper. The data owners can upload data on to the cloud; can also create permissions on the uploaded data to control its access by various types of users. Cryptographic techniques incorporated along with the traditional access control policies really enhances the security of data. The analysis on the review points to the insider threats in cloud security as one of the greatest issue in cloud computing.