The Joomla 2.5 application comes with a preinstalled ReCaptcha plugin. Using it allows to protect the Joomla registration and contact forms from spam bots.
The plugin can be managed from the Joomla 2.5 admin area -> Extensions -> Extension Manager -> Plug-in Manager ->Captcha - ReCaptcha.
Get the API keys from http://google.com/recaptcha and enter them in the Public and Private Key fields. Save the configuration.
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