Simple and Secure – Fantastic

Rather than remembering a username/password combination this plugin allows you to log into your website using your smartphone and an onscreen QR code served by the WordPress plugin. Point your phone at the website login page and you’re in.
Account setup with RapID-SL is straightforward – after that all the security is taken care of by them.
There seem to be plenty of options to specify which of your users use the RapID login so for example admins can use RapID-SL to log in while casual commenters can log in with the usual password/username method.
I have several WordPress sites. The phone app stores the credentials for each of them and allows me to log in to each with its own secure encryption.
This is how my bank account login should work!