More and more botnets based brute-force login attempts are seen lately (2013).

To add a captcha for the admin login form you can do the following :

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• Active the Captcha Code plugin.

https://help.squat.net//captcha-admin-login/Login-Captcha-0.png

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• Check whether you can configure it right away.

If you get the frontpage or get logged you might need to temporarily disable a firewall plugin,
and enable the firewall plugin again after configuring the Captcha Code plugin.

https://help.squat.net//captcha-admin-login/Login-Captcha-4.png
https://help.squat.net//captcha-admin-login/Login-Captcha-5.png

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• Configure the Captcha Code plugin. It makes sense to enable only the admin login part
  and not for comment forms, to prevent possibly problems with other captcha or anti-spam plugins
  for comment forms.

https://help.squat.net//captcha-admin-login/Login-Captcha-1.png

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• After saving your changes, log out, and you should see something like this :