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Class: ASCII CAPTCHA

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  Classes of Debug  >  ASCII CAPTCHA  >  Download .tar.gz .zip  >  Support forum Support forum (3)  >  Blog Blog  >  RSS 1.0 feed RSS 2.0 feed Latest changes  
Name: ASCII CAPTCHA
Support forum Support forum
Base name: ascii_captcha
Description: CAPTCHA validation using ASCII art text
Related classes: , , , , , , ,
Version: -
PHP version: 3.0
License: The PHP License
All time users: 2952 users
All time rank: 1010
Week users: 2 users
Week rank: 1677
Picture of Debug
Author: Debug <e-mail contact>
Packages: 4 Browse this author's classes Browse this author's classes
Country: United States United States - PHP jobs in United States
Age: 22
All time rank: 46754 in United States United States
Week rank: 715 Down75 in United States United States Down
Innovation award
Innovation award
Nominee: 4x


  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.

 

  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

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  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

  User ratings  
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All time:
Sufficient (79.2%)
Sufficient (79.2%)
Sufficient (75.0%)
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Not sure (55.0%)
1152
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  Trackback links  
Link Description
Ca(p)tch(a) me Captchas sind eine feine Sache...
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  Applications that use this class  
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  Files folder image 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
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