Cloud computing is a revolutionary computing pattern, which enables flexible, on-demand, and low-cost usage of computing possessions, but the data is outsourced to some cloud servers, and various privacy concerns appear from it. Various schemes based on the attribute-based encryption have been proposed to secure the cloud storage. However, most work focuses on the data contents privacy and the entrance organize, while less attention is paid to the privilege control and the identity privacy. In our proposed we offer complete user security and data security. Encryption / Decryption algorithms are used for data security, for user the password is automatically generated by the system. If the user wants to upload the data the authority will send a 16 bit private key to the data owner. After putting this key data owner can upload his documents to the cloud, drop box is a public cloud here we are used.