Abstract
: In the cloud environment, resources, servers and users are shared among all of the individuals. So it is difficult for cloud providers to ensure file safety. Consequently if an intruder, use and misuse the data, it is basically very easy to destroy. Cloud computing security key issues are which focuses on the development of cloud computing security solutions encyclopedia This thesis using Blowfish algorithm and hash data security, authentication, and integrity of files is able to solve problems on the cloud secure file exchange is present in reducing cloud. Cryptography algorithms improve data security. In our system, we enhanced symmetrical, asymmetrical and hash algorithms, which provide better results for unified performance standards.