The reCAPTCHA MediaWiki plugin uses a CAPTCHA to prevent spam. Here is how to add reCAPTCHA to MediaWiki:
1.Download the zip file.(note that this plugin only works with MediaWiki 1.8 or newer)..
2.Unzip the MediaWiki extension.
3.Enter the public and private keys in LocalSettings.php. (If you haven't done so, you must sign up for reCAPTCHA keys here.) If you are running wikis for multiple domains, you have to repeat these steps for each wiki. reCAPTCHA keys are tied to a specific domain, so you may need multiple key pairs.
4.That's it! You should have CAPTCHAs now!
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