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Joomla! 1.5 Top Extensions Cookbook by Suhreed Sarkar

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Using Captcha on a user registration form

The default registration form in Joomla! doesn't provide any means to check whether the registrant is a human or a bot. Introducing a check for humans such as placing a cryptic image or a math challenge—can prevent automated registration by bots. Using Captcha for registration forms can enhance security by preventing such automated registrations. In this recipe, I am going to show you how to enhance the security of your registration form by adding Captcha to Joomla! 1.5.

Getting ready...

AlphaRegistration is a popular extension that allows Captcha images to be shown on registration forms. Download this freely available extension from http://www.alphaplug.com/index.php/downloads.html?func=showdown&id=22 ...

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