This project provides the SimpleCaptcha class. The images are similar to google captchas. Basic example: session_start();
$captcha = new SimpleCaptcha();
// Change configuration...
//$captcha->wordsFile …
This project is meant to be simple yet powerful enough to withstand most of the spam bots and other automated attacks. First of all let me say that this project meets Image and Script Security requirements …
3DCaptcha is an easy to use captcha written in PHP. It features: A new approach to captchas, using human's 3D spatial cognition abilities to differentiate from a machine. It uses a markov-chain to generate …
CAPTCHA is an acronym for Completely Automated Public Turing Test to Tell Computers and Humans Apart. As the name suggests, it's a kind of test that can reliably determine is the solver human, allowing …
Securimage is an open-source free PHP CAPTCHA script for generating complex images and CAPTCHA codes to protect forms from spam and abuse. It can be easily added into existing forms on your website to …
By default, Kaptcha is very easy to setup and use and the default output produces a captcha that should be fairly hard to bust. The captcha's it produces by default look very similar to the one above. …
SimpleCaptcha is a Java library for generating CAPTCHA challenge/answer pairs. SimpleCaptcha is intended to be easy to implement and use sensible defaults, while providing easily-accesssible hooks for …
A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used …
Ajax Fancy Captcha is a jQuery plugin that helps you protect your web pages from bots and spammers. We are introducing you to a new, intuitive way of completing “verify humanity” tasks. In order to do …
The Captchacker Project: Captcha Breaking using Support Vector Machines The Captchacker Project exploits the potential of Support Vector Machines to break visual captchas. We define “simulation-based” …
JCAPTCHA stands for Java Completely Automated Public Test to tell Computers and Humans Apart The open source java framework for captcha definition and integration
