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Class: Math Guard


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  Classes of m  >  Math Guard  >  Download  >  Support forum Support forum (1)  >  Blog Blog  >  RSS 1.0 feed RSS 2.0 feed Latest changes  
Name: Math Guard Support forum
Base name: mathguard
Description: CAPTCHA validation using math expressions
Related top rated classes: ,
Version: 0.2
Required PHP version: 3.0
License: GNU General Public License (GPL)
All time users: 489 users
All time rank: 3659
Week users: 1 user
Week rank: 3357
 
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Author

Picture of m
Name: m <e-mail contact>
Published packages: 1 Browse this author's classes Browse this author's classes
Country: Slovak Republic Slovak Republic - PHP jobs in Slovak Republic
Home page: ???
Age: ???
All time rank: 2028
Week rank: 1982

Innovation Award

PHP Programming Innovation award nominee
June 2007
Number 7
 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. Obviously, such images cannot be read by blind users using regular text to speech conversion programs.

This class provides a CAPTCHA alternative that is not based on images, but rather on simple math operations.

This way, blind users can read what is written in the pages and pass the CAPTCHA validation tests giving the correct results to requested operations.

Manuel Lemos

Groups

Group folder image HTML HTML generation and processing 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

Detailed description

This class can be used to perform CAPTCHA validation presenting simple mathematical expressions to the users to make it difficult for robots to pass a form being validated.

It displays a mathematical expression of a sum between two random numbers and asks the user to enter the result in a text form input.

The class generates an hash of the result using a secret prime number that is passed in an hidden form input.

When the user enters the result, the class validates it comparing the hash of the value entered by the user with the hash passed in the hidden input.

Freshmeat project

Math Guard
Project record: mathguard
Popularity score: 22.58
Vitality score: 1.04

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Files

File Role Description
Plain text file ClassMathGuard.php Class Main MathGuard class
Plain text file formhandler.php Example The php script which handles the verification and action
Plain text file index.php Example Main sample Form that has to be protected
HTML file readme.html Doc. Simple readme file with the example description
Download all files: mathguard.tar.gz mathguard.zip
NOTICE: if you are using a download manager program like 'GetRight', please Login before trying to download this archive.

 
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