Boxcryptor

Boxcryptor encrypts your data on your device before it is synchronized to the cloud. Thereby, the highest possible protection of your data is guaranteed. The software can be used with Dropbox, Google Drive, Microsoft OneDrive, and many more cloud providers. You keep full control of the content in your cloud, since it is encrypted with leading AES-256 and RSA encryption before synchronization. Because of the zero knowledge standard, even we at Boxcryptor cannot access your data.