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Class: Math Guard


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  • Supplied by:

    Picture of m
    Name: m <e-mail contact>
    Published packages: 1
    Country: Slovak Republic Slovak Republic - PHP jobs in Slovak Republic
    Home page: ???
    Age: ???
    All time rank: 1827
    Week rank: 1649

    Browse this author's classes

  • 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: 69.22 (0.11%)
    Popularity rank: 33,585 (PHP Classes: 244)
    Vitality score: 1.16 (0.00%)
    Rating: Not yet rated Please rate this class in Freshmeat

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  • Applications that use this class:

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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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