Cloud computing is a collection of technologies that have come together with the use of internet, it will serve the customer’s or user’s. While user’s store their data in the cloud it is important that the data should be in a secure manner. For maintaining the data securely we have proposed a scheme which consists of three entities those are users, TPA and the cloud server. Here in the place of cloud server we have used Dropbox. By implementing this concept we will be able to provide security for the data which is stored in the cloud server from the un-authorized access. This concept is applicable for accessing data either in distributed environment or can run the application concurrently by number of cloud users. The main objective is to store the data in the public cloud in an encrypted form rather than in a plain text manner for maintaining data security and confidentiality
