Cloud computing become an IT fuzzword from past few years. Cloud computing accumulates all the computing resources and manages them by some software. There are billions of users using cloud services synchronously. Users need not to worry about how to buy the servers or software's for a long time perspective instead they can directly use or buy computing resources from the cloud using internet. Users generally worry that the cloud computing providers can misuse their important data present on cloud. The only way is to use some encryption method to hide the authors' plain text such that it cannot be figured out with intrusive eyes.