Sophos Mobile Encryption is a free iPhone app that gives you access to encrypted files stored in the cloud. Its new version offers today support for Google Drive and generic WebDAV.
The extension of Hypertext Transfer Protocol (HTTP) that facilitates user collaboration, Web Distributed Authoring and Versioning (WebDAV) is a protocol that makes the Web a readable and writable medium.
Η Sophos Mobile Encryption gives you access to encrypted files on your iOS device while files are encrypted with SafeGuard Encryption for Cloud Storage to be safely stored in the cloud. Opening files requires a password. Users can also access encrypted files imported with iTunes.