Description of RailsCaptcha.

My version of SimpleCaptcha

Repackaged visualCaptcha's backend service, including translation and minor modification. Mainly for private use. Everything still belongs to original author: emotionLoop.

Simple lib to generate a math_captcha to prevent spammers in form. Supports localization.

Quick little arithmetic plain-text captcha

create captcha for api based project

This version include two important page 'Contact' and 'Register' with the 'Math-Captcha' method submit for prevent hacker attack.

MVC based Math, Logic Captcha

Integrate the AreYouAHuman.com CAPTCHA alternative human verification into your Ruby/Rails application

This is mt first gem

A simple image captcha gem

dongsx

This gem enable to use Captchme. Anti spam, Monetize captcha and Audience qualification

A smart captcha library

RedisCaptcha provides simple captcha that can be read by human.

这是一个验证码生成器。基于rucaptcha。本人只是将他的源码拉下来。为我的网站进行适配。因为我不使用sesion.id

you will get arithmatic sum with answer you just have to compare with ur user in controller

NO LONGER MAINTAINED AND NOT RECOMMENDED, AS BOTS ARE ABLE TO RESOLVE CAPTCHAS BETTER THAN HUMANS. Based on Login Attempts check if captcha is necessary. It stores a permanent cookie and uses a table for tracking login requests.

Captcha based on encyrpting and decrypting user data by mathematical operation

This plugin adds helpers for the YinXiangMa CAPTCHA API