Created by Fabiano 'Wundo' Sant'Ana, The CAPTCHA module is great for stopping spam posts and automated account creation on a Drupal site. It gives you the ability to set a CAPTCHA on any Drupal form, which has come in handy on this site as I have been receiving emails similar to this recently:
W09zxA <a href="http://khffvokqjfyd.com/">khffvokqjfyd</a>,
[url=http://comysmauwhce.com/]comysmauwhce[/url],
[link=http://ccfthzcigekg.com/]ccfthzcigekg[/link],
http://eiwvpmvppwhs.com/
Looks like some one is testing their blog spam script. Anyway the CAPTCHA module helps stop this by requiring users to enter either the alphanumerics displayed in a picture or by asking a question such as
'What is the fifth word in the phrase "yasev iko epeha huvo usa"?:'.
The image-based CAPTCHA has a variety for options as to what it shows. You can set the following:
- Characters to use
- Length of the code
- Font (you need to upload a .ttf file to use a custom font)
- Font Size
- Character spacing
- Distortion Level
- Smooth distortion
- Double Vision
- Add salt and pepper noise
- Add line noise
- Noise Level
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