Camio uses Google Accounts or Facebook for sign-in for both security and convenience.
We especially like Google's advanced sign-in security that
gives you the option to set up 2-step verification.
Facebook Login Approvals also provide added security.
But even more important, you don't have to create yet-another-account to remember.
Camio simply accepts proof from Google or Facebook that you've signed-in, and you share only your email address with Camio.