We just released a new plugin, which extends our service, Loitr, to WordPress blogs.
Loitr enables you to login to your WordPress blog without typing anything. A login attempt just takes scanning the login QR on the login page with the Loitr app(available for Android/iPhone). All the collaborators(editors, authors, subscribers) of your blog can use Loitr once activated. NOTE: Loitr doesn't need to know the login id or password of the collaborators of your blog for it to work.
Since Loitr is 2-Factor(need to know your Loitr app password and have the phone as well) and doesn't need usernames and passwords, it is more secure than the conventional login.
We have just launched and have got a few WordPress blogs using it and it would be great if its of any help to anyone else as well.