[module] CAPTCHA

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A CAPTCHA is a challenge-response test most often placed within web forms to determine whether the user is human. The purpose of CAPTCHA is to block form submissions by spambots, which are automated scripts that post spam content everywhere they can. The CAPTCHA module provides this feature to virtually any user facing web form on a Drupal site.


Required by modules [Drupal7[

A no-brainer, install it, switch it on, and configure it to use Image Captcha (mostly). Easily the easiest of the spam and login protection modules (although its own project page has links to many other similar modules).

If you don't want to annoy your audience when you have your Image CAPTCHA noisy enough to prevent modern automated attacks, I highly recommend you also install Image CAPTCHA Refresh so users can reload and refresh overly difficult challenges.