The methods and systems described herein provide for secure implementation of external storage providers in an enterprise setting. Specifically, the present invention provides for allowing the secure use of processes that may transmit files to external storage providers or access files from an external storage provider. In some arrangements, process, such as an untrusted process, may request access to a file. A security agent may intercept the request and encrypt the file. The file can then be transmitted to the external storage provider. A user may subsequently request access to the file. A security agent may intercept a message in connection with this request, determine whether the user is authorized to access the file, and decrypt the file.