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Class: ASCII CAPTCHA


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  • Supplied by:

    Picture of Debug
    Name: Debug <e-mail contact>
    Published packages: 3
    Country: United States United States - PHP jobs in United States
    Home page: ???
    Age: 18
    All time rank: 741
    Week rank: 221

    Browse this author's classes

  • Innovation Award:

    PHP Programming Innovation award nominee
    May 2008
    Number 2
    		 CAPTCHA validation is a way to make it more difficult the use of robot scripts to impersonate real users accessing sites.

    Many techniques have been developed to implement different variants of CAPTCHA validation, but some can easily be defeated with more sophisticated robots.

    This class provides different approach by using text rendered as ASCII art instead of using the usual obfuscated images. This way, existing CAPTCHA breaking robots would need to be adapted to bypass this solution.

    Manuel Lemos

  • Groups:

    Group folder image Text processing Manipulating and validating text data 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, display text letters using ASCII art fonts.

    It generates a CAPTCHA validation text string with random letters and then renders that text as an ASCII art string with multiple lines that represent the validation text with some distortion and noise characters.

    The random validation text and the rendered text are returned as strings.

  • User ratings:

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    All time:
    Good (92.9%)
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    Sufficient (79.2%)
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    Sufficient (62.9%)
    423
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  • Trackback links:

    Link Description
    Ca(p)tch(a) me Captchas sind eine feine Sache...
    Latest blog trackback links Latest blog trackback links

  • Applications that use this class:

    No application links were specified for this class.
    Add link image If you know an application of this package, send a message to the author to add a link here.

  • Files:

    File Role Description
    Plain text file documentation.html Doc. Documentation
    Plain text file ascii_captcha.class.php Class The main ASCII CAPTCHA class
    HTML file example.html Output Example code and output
    Download all files: ascii_captcha.tar.gz ascii_captcha.zip
    NOTICE: if you are using a download manager program like 'GetRight', please Login before trying to download this archive.

 
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