Abstract: Cloud computing is new trends in information technology that enables scalable and on-demand access to a shared pool of networking recourses over the internet for efficient services delivering. Cloud computing enables all the existing technologies such as dynamic provision, storages resources and networking virtualization to the user in the form of “pay as you go”. One of the open challenges of the cloud computing is security. Organizations have sensitive information to access cloud computing because of multi-tenancy approach and security. The unauthorized access will lead to loss of the organization reputation and financial loss. In this study, we propose a cloud-based encryption for the documents using the platform of the salesforce.com. The salesforce cloud computing provides a free access to the cloud objects under the user account. We use the configuration of API, WSDL, SOAP, security token and attributes of account object to design and implement a secure system for uploading the organization documents. The results show that the documents can be upload and encrypted easily in a m/sec. The implemented approach shows that the access to the cloud files is denied by unauthorized users. In addition, the multi-tenancy aspect is denied to access the sensitive information due to the encrypted uploaded files using the DES algorithm in this research. Finally, the uploaded files were uploaded in the different format and size. The obtained results show the DES algorithm provide an efficiency with cloud computing due to reducing in time implementation.