> How is no password more secure than username+password?

[**It is if you use a shared key**][1]. Here's the way it works, simply explained.

You have a secure key on your computer. The one that you're trying to log in to has a key that matches it. This allows a simple, quick, and secure passwordless login. 

[This link][1] is mostly about remotely logging into a remote server via ssh, without entering a username and password. I do that all the time when I need to ssh into my leased bare-metal server in another state. *Surely, it's possible to do that in your case*.


  [1]: https://www.google.com/search?newwindow=1&safe=active&client=tablet-android-samsung&ei=aVWIW_O3F4z4tAWF7bmACQ&q=ssh%20public%20key%20authentication%20&oq=ssh%20public%20key%20authentication