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Animated CAPTCHA: CAPTCHA validation using animated math expressions

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  Author Author  
Picture of Josh Storz
Name: Josh Storz <contact>
Classes: 1 package by
Country: United States United States
Age: ???
All time rank: 44052 in United States United States
Week rank: 580 Down59 in United States United States Down
Innovation award
Innovation award
Nominee: 1x


  Detailed description   Download Download .zip .tar.gz  
This class can be used to perform CAPTCHA validation presenting to the users simple mathematical expressions as a sequence of animated pictures to make it difficult for robots to pass a form being validated.

It generates an animated GIF image that displays a mathematical expression of a simple operation between two random numbers, like sum, subtraction and multiplication.

The numbers and the operation are stored in session variables for posterior verification.

  Classes of Josh Storz  >  Animated CAPTCHA  >  Download Download .zip .tar.gz  >  Support forum Support forum (3)  >  Blog Blog  >  RSS 1.0 feed RSS 2.0 feed Latest changes  
Name: Animated CAPTCHA
Base name: animatedcaptcha
Description: CAPTCHA validation using animated math expressions
Version: 1.1
PHP version: 4.0
License: GNU Lesser General Public License (LGPL)
All time users: 5889 users
All time rank: 356
Week users: 3 users
Week rank: 614 Down
 
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  Groups  
Group folder image Graphics Colors, images, charts and picture formats View top rated classes
Group folder image Validation Validation algorithms View top rated classes
Group folder image Security Security protection and attack detection View top rated classes


  Innovation Award  
PHP Programming Innovation award nominee
June 2007
Number 6


Prize: One year server license IP to country region city database
CAPTCHA validation is being used everywhere on the Internet to make it difficult for robots to access sites that should be accessed only by real human user beings.

One of the problems is that most solutions are based on images that show validation text that is easy to guess using common OCR (optical character recognition) programs.

This class provides a CAPTCHA alternative that uses animated images. In each animation frame, it is presented a number or the symbol of a simple math operation that the users must solve to pass the validation tests.

This solution raises the difficulty to robots in comparison to other CAPTCHA solutions that are easier to defeat by the current generation of robots.

Manuel Lemos

  User ratings  
RatingsUtility Consistency Documentation Examples Tests Videos Overall Rank
All time: Good (81%) Good (81%) Good (81%) Good (83%) - - Sufficient (65%) 447
Month: Not yet rated by the users

  Pages that reference this package  
Animated Captcha - Image Validation
The easiest way to keep spam bots away...
Animierte Captcha Grafik [php]
Der Entwickler Josh Storz hat eine durchaus Interesannte Captcha-Grafik Entwickelt...
Comment Spam Killer - Class: Animated CAPTCHA (CAPTCHA, validation, ocr, animated GIF) - PHP
This class can be used to perform CAPTCHA validation presenting to the users simple mathematical...

Latest pages that reference packages Latest pages that reference packages


  Applications that use this package  
STAEP Job Postings
security enhancement for job posting form.
Christian Ringtone
captcha in contact form
employee scheduling software
Comment script for each school uses Animated CAPTCHA
Add link image If you know an application of this package, send a message to the author to add a link here.

  Related pages  
Animated Gif Captcha Resources
The official launch page of Animated Gif Captcha

  Files folder image Files  
File Role Description
Files folder imageframes (15 files)
Accessible without login Plain text file example.php Example Working Example
Plain text file GIFEncoder.class.php Class GIFEncoder class
Accessible without login Plain text file index.php Example Main Function - Displays picture & sets session
Plain text file OOP4.php Class OOP4
Plain text file OOP5.php Class OOP5
Accessible without login Plain text file readme.txt Doc. readme

  Files folder image Files  /  frames  
File Role Description
  Accessible without login Image file 0.gif Icon readme
  Accessible without login Image file 1.gif Icon readme
  Accessible without login Image file 2.gif Icon readme
  Accessible without login Image file 3.gif Icon readme
  Accessible without login Image file 4.gif Icon readme
  Accessible without login Image file 5.gif Icon readme
  Accessible without login Image file 6.gif Icon readme
  Accessible without login Image file 7.gif Icon readme
  Accessible without login Image file 8.gif Icon readme
  Accessible without login Image file 9.gif Icon readme
  Accessible without login Image file equals.gif Icon gif frame
  Accessible without login Image file minus.gif Icon gif frame
  Accessible without login Image file plus.gif Icon gif frame
  Accessible without login Image file solve.gif Icon gif frame
  Accessible without login Image file times.gif Icon gif frame

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