the entire directory only in Abuse/CAPTCHA

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See also:

• Computers: Internet: Abuse (85)
• Computers: Internet: Abuse: Comment Spam (15)
• Computers: Internet: E-mail: Spam: Preventing (63)

This category in other languages:

• Russian (4)

• 3DCaptcha - Open source system that uses spatial cognition abilities of humans to differentiate them from machines.
• CAPTCHA: Telling Humans and Computers Apart Automatically - Includes demonstrations, research papers, and news.
• Captcha Creator - PHP Captcha Script that generates unique captcha images to stop automated submissions, highly customizable, easy to install and configure.
• Inaccessibility of CAPTCHA - A W3C Working Group Note explaining how CAPTCHAs can present a major obstacle to users who have limited vision or a learning disability such as dyslexia. This document examines a number of potential solutions and alternative systems.
• JCaptcha - An open source Java framework for captcha definition and site integration. Project information, documentation, issue tracker, and download.
• Securimage - Open source PHP script for generating image CAPTCHAs with audio alternatives. Includes documentation, a gallery and an online demonstration. [LGPL]
• TheCAPTCHA - Offers a free and open source PHP script to reduce spam, also contains a detailed article about CAPTCHAs.
• Wikipedia: CAPTCHA - Explains how captcha features can keep spammers from signing up for certain accounts online, such as email or weblogs. Explains how the system can be circumvented as well.
• reCAPTCHA - A captcha system that uses successful decodings to helps digitise books for online use. Background, and details on how to incorporate into a site. Source code in several languages, and plugins for popular blogging and CMS software.
• What’s Up CAPTCHA? A CAPTCHA Based On Image Orientation - Paper by Rich Gossweiler, Maryam Kamvar, and Shumeet Baluja describing an investigation into a new type of CAPTCHA based on asking users to say which way up an image should be. [PDF] (April 01, 2009)

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