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CAPTCHA - spam protection

Submitted by Lmg on 4. March 2008 - 15:12.
in

added the drupal-module 'CAPTCHA' to prevent automated spambot registrations which accumulated recently. -> CAPTCHA project

"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 from spambots – automated scripts that harvest email address from publicly available web forms."

Image CAPTCHA configuration

Submitted by Lmg on 9. April 2008 - 16:51.
the default font and settings produced hardly (human) readable results, so here's what it took to make the module more user-friendly.
  • copy a nice TTF font to: sites/all/modules/captcha/image_captcha/fonts
    I've chosen "TSCu_Comic" which is a free font that came with my linux installation.
  • goto admin/user/captcha/image_captcha
    • make sure you remove lookalike characters from the list of characters to use (Il|!+t..)
    • set the distortion level to "moderate" or "low" YMMV
    • I also enabled "smooth distortion"
  • further in admin/user/captcha
    check "Omit challenges for a form once the user has successfully responded to a challenge for that form."
there you go, nice spam protection. YAY!