Class: Another CAPTCHA project (CAPTCHA, Manuel Lemos, lemos, screenshot)

Screenshots:

File	Role	Description
`captcha.gif`	Screen	Example CAPTCHA image
`Captcha_volume2.gif`	Screen	Captcha vol.2 class screenshot

Supplied by:

Name:	László Zsidi `<e-mail contact>`
Published packages:	9
Country:	Hungary - PHP jobs in Hungary
Home page:	`http://forum.gifs.hu/`
Age:	34
All time rank:	91
Week rank:	38

Browse this author's classes

Innovation Award:

October 2006
Winner

CAPTCHA validation has become a widely adopted method to prevent that people use robot scripts to abuse from Web site content or services.

It uses images with fuzzy text to make it more difficult for robots that attempt to automatically read the text that is written. Meanwhile, several techniques have been developed to discover the text in the CAPTCHA validation images.

This class provides a more advanced solution that employs animated images to render the verification text.

It raises the bar in terms of the difficulty that it imposes to robots, as the actual text is never completely displayed in each of the animated image frames.

Manuel Lemos

Groups:

Graphics	Colors, images, charts and picture formats	View top rated classes
Validation	Validation algorithms	View top rated classes
Security	Security protection and attack detection	View top rated classes

Detailed description:

This package can be used to perform human user validation using CAPTCHA images (Completely Automated Public Turing to tell Computers from Humans Apart).

It generates a sequence of animated images, assembled with in a GIF animation file, to make it more difficult to break by robots because the validation text does not completely appear in each of the animation images.

The text length, color and font are configurable.

User ratings:

Ratings	Utility	Consistency	Documentation	Examples	Tests	Videos	Overall	Rank
All time:	`Good (87.5%)`	`Sufficient (72.9%)`	`-`	`Sufficient (75.0%)`	`-`	`-`	`Not sure (58.5%)`	687
Month:	Not yet rated by the users

Packages needed by this class:

Class	Dependency	Why it is needed
GIF images into animated GIF with native PHP class	Required	Generating single animation

Trackback links:

Link	Description
Animated CAPTCHA in PHP	Found an easy way to create animated CAPTCHAs in PHP...
Animierte CAPTCHAS? Ein Ungar macht es möglich: Another CAPTCHA project	CAPTCHAS gibt es ja überall, und darunter gibt es wiederum schöne und weniger schöne...

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Applications that use this class:

No application links were specified for this class.

If you know an application of this package, send a message to the author to add a link here.

Related links:

Link	Description
Demo pages	CAPTCHA 2 demo page
Demo pages	CAPTCHA 3 demo page
Demo pages	CAPTCHA 4 demo page
Donate Page	Donate to development
Download page	Download originaly tested and packed CAPTCHA generators

Files:

File	Role	Description
`Captcha.class.php`	Class	animated CAPTCHA creator class
`captcha.php`	Example	CAPTCHA image resource file
`captcha`
`captcha_files.txt`	Data	CAPTCHA real files holder directory
`Captcha2.class.php`	Class	Captcha.class.php - Volume 2
`fonts`
`fonts.txt`	Data	Truetype fonts holder directory
`index.php`	Example	Example index file

Download all files: animated_captcha.tar.gz animated_captcha.zip

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Class: Another CAPTCHA project

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