A Captcha is a challenge-response image or text field that is usually placed at the end of forms to ensure that submissions are not from bots. For more information, please refer to our php captcha scripts post.
Normally, you see Match Captcha with HTML elements and calculating result. We now build captcha that shows the mathematical question as images.
So that no programs can read the images equations.
Please checkout the DEMO
BigBear Defence is simple to use for users with small knowledge of HTML and PHP. Settings are in separate files and all files needed are collected in a sub directory to keep it clean.
Settings files allow changing colors, font, effects and size of font and image.
SPEEDCOIN CAPTCHA - PROTECTING AGAINST SPAM, PROTECTING YOUR FILES FROM DIRECT DOWNLOADS AND MONETISE YOUR WEBSITE. IT IS FREE! INSTALL CAPTCHA ON YOUR WEBSITE.
It is a simple PHP/MySQL script which you can easily integrate into your own website in minutes - download archive, read file readme.txt, edit file speedcoin_config.php and place on each of your webpages simple code.
Speedcoin Captcha will provide you with FREE Speedcoins (internet currency) each time a visitor of your website uses Speedcoin captcha on your website. You can use the Speedcoin captcha on the new user registration page of your website or on other pages where your website member needs to fill in web forms on your website, file downloads protection. Later you can convert to Bitcoins on Coinaccel exchange, etc.
A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot. We need to add CAPTCHA validation on common form like contact us, enquiry
Preventing Comment Spam in Blogs.
Most bloggers are familiar with programs that submit bogus comments, usually for the purpose of raising search engine ranks of some website (e.g., “buy penny stocks here”). This is called comment spam. By using a CAPTCHA, only humans can enter comments on a blog. There is no need to make users sign up before they enter a comment, and no legitimate comments are ever lost!
Drawings are universal way to represent real life objects. Even if they are distorted, they can be understood by children . But computers cannot recognize them as entities abstraction. This project is based on that concept, showing distorted drawings in a table and ask to select the correspondent images
PHP SHOW Monitor
How to use：
1. visit m.php once is ok!
2. it is not necessary to keep it all the time!
3. the log is under Root directory
it is free and simple but good for you to monitor your website.
EM Captcha - Visual PHP captcha class from EM-Creations.co.uk
EM Captcha is a simple and easy to implement PHP captcha class.
PHP version 5.4.0 or above
GD Image Library and SQLite3 PHP Extentions
Advanced CAPTCHA class which does not require any image processing extensions (GD/ImageMagick/etc). Developed to be readable by humans and resistant to OCR software. It generates black-and-white images with few distorted letters and noise. Checking algorithm is case-insensitive. It has very simple API (documentation is available on download page) which makes it easy to implement it on new and existing websites.
Ever get tired of the old troublesome words you need to type always? Well with zCaptcha you just simply click on the image that you think is best suited for.
It may sound simple but in fact its a powerful anti-bot captcha with over 3000 possible results. zCaptcha also comes with the property of anti-OCR (Optical character recognition). zCaptcha also has many different soft effects that users will enjoy using.
The zCaptcha is can be fully customized to fit your needs. You can change just about anything. You can add new images/icons without any hassle. The description for the images is a single variable which can be written in any language. You can also manage where your users will get redirected to if they input the correct answer.
Challenger is simple, easy to use and secure captcha verification handling script. It can serve images containing text and/or mathematical equation and/or UTF -8 encoded string and/or photo. It works with any PHP version and is cross-browser compatible. The package comes with multiple example source code and a cool modern form.
HELLOCAPTCHA announces the new generation of CAPTCHAs (wikipedia.org/wiki/CAPTCHA). We are proud to introduce the most effective technology for human tests. Our CAPTCHAs are combining the most recent results of computer science and art. Our CAPTCHAs are more readable, more secure and are nice. We provide our technology via a free web service with an embedding code.
This is one of the easiest CAPTCHA scripts you will ever use. While it doesn’t obscure the text, it will serve its purpose well for many people who need a low-level CAPTCHA solution. This script requires little-to-no setup. The only dependency is the PHP GD library.
It can be as simple as this to use, but it is also configurable:
More details and an example on our website.
We all know that todays captchas generate string that most of times are hard to read from eye of human and this requires that the page must reload (refresh) to generate new captcha string, and after refreshing page you may lost some of information you’ve already wrote in the input fields, meanwhile this creates frustration to you as user.
For this reason SoundCaptcha offers the second chance, possibility to hear captcha token via voice speaker then type it on the captcha input field, and this increases the probability that user will type the correct required “token”.
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