Hardened WordPress with Yubikey

I was getting bored of seeing too much automated hack-in attempts to my WordPress. I know my password is hard to guess but still I felt unsure. So I installed few WordPress plugins: Limit Login Attempts and Yubikey-plugin (which I already own).
Now all login attempts require to know my username, password and 3rd party random code which is generated by my Yubikey (see www.yubico.com).

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