Two factor authentication for SSH with a YubiKey

I got a YubiKey (which is a USB device that can do one-time passwords
using a few different methods), and wanted to use it with SSH instead of
just a password. 

So with an evening of playing, I got it working. This also allows for a
second method as a backup in case you lose the yubikey. I have it
working with the Google Authenticator app on Android.

http://www.kallisti.net.nz/blog/2013/09/yubikey-logins-with-ssh/

Robin.

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