If you use Dropbox, Google Drive, or Yandex.Disk, then you have no doubt appreciated the convenience of always having all of your important files handy on any device. A file can be shared with friends or coworkers in a second. However some find the data security on these popular services lacking, worrying that unauthorized people might gain access to their files.

Accidentally making your private photographs or pay stubs available to employees of your hosting provider would be a horrifying mistake, for example. To minimize that sort of risk, the data on a server needs to be stored in encrypted form, with only you able to grant access to it. How can you make that happen?