Kohana Captcha Library

Captchas are used to protect your site by showing something that a computer can't recognize but a human can. They are usually placed on your registration page but they can be placed anywhere you want to make reasonably sure you are dealing with a person and not a bot.

Kohana's Captcha library can currently generates basic, alpha, word, math, riddle captchas. Captcha configuration is defined in groups which allows you to easily switch between different Captcha settings for different forms on your website.