Use: prevent non-human interaction, to fill out and submit the form automatically (hacking).
Options:
Most options are used to determine how the captcha field should be displayed, the size, color, font and background.
There are however a few settings that are very specific to Captcha
- Noise factor: to prevent attackers from deciphering the captcha , background noise can be added.
- Line factor: lines are added to the Captcha image
- Warp factor: the level of distortion applied to the Captcha text to prevent an OCR (optical Character recognition) application to read it
