What is Captcha

CAPTCHA is an acronym for "Completely Automatic Public Turing Test to Tell Computers and Humans Apart". It is a task, that human can easily solve, but computer not.

It is used as a challenge-response to ensure that the individual submitting information is a human and not an automated process. Typically, a captcha is used with form submissions where authenticated users are not necessary, but you want to prevent spam submissions.

What is Hooto Captcha

hcaptcha is a free, easy-to-use WebService helps enterprises to integrate Captcha into their own business systems. Similar to Google reCaptcha but can be customized and deployment to your private network.

Features

• High Security: using the distorted, bonding, dislocation and random word length, making it difficult to be dismantled, recognition by machine
• High Performance: Based on C/libevent/libgd/memcached, all levels of optimization, upto 500 Requests pre second in single-threaded (120x60 pixels)
• Local Deployment: Similar to Google reCaptcha but can deployment to private network
• Cluster Deployment： Support for large-scale network deployment LVS -> Hooto Captcha Cluster -> Memcached Cluster

Example

Project, WebService API

• https://github.com/eryx/hcaptcha

Reference

• http://www.captcha.ru
• http://www.google.com/recaptcha