Data Security in Cloud

Cloud computing is a new computational paradigm that offers an innovative business model for organization to adopt IT without upfront investments. Despite the potential gain achieved from the cloud computing. It is clearly one of today„s most enticing technology area due, at least in part, to its costefficiency and flexibility. Cloud computing moves the application software and database to the large data center where the data management and services may not be fully trustworthy. In this article our major discussion on the cloud data storage security. The security is an important aspect of quality of services. To ensures the correctness of user data in cloud. We propose an effective and flexible distribution scheme two way handshakes based on token management. By utilizing the homomorphic token with distributed verification of erasure-coded data, our scheme achieves the integration of storage correctness insurance and data error localization i.e., the identification of misbehaving server(s).