Animated CAPTCHA
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Innovation award Nominee: 1x | |||||||||||||||||||
This class can be used to perform CAPTCHA validation presenting to the users simple mathematical expressions as a sequence of animated pictures to make it difficult for robots to pass a form being validated.
It generates an animated GIF image that displays a mathematical expression of a simple operation between two random numbers, like sum, subtraction and multiplication.
The numbers and the operation are stored in session variables for posterior verification.
It generates an animated GIF image that displays a mathematical expression of a simple operation between two random numbers, like sum, subtraction and multiplication.
The numbers and the operation are stored in session variables for posterior verification.
| Classes of Josh Storz | > | Animated CAPTCHA | > | Download .zip .tar.gz | > |  Support forum (3) |
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Graphics | Colors, images, charts and picture formats | View top rated classes |
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Validation | Validation algorithms | View top rated classes |
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Security | Security protection and attack detection | View top rated classes |
| Innovation Award | ||
 June 2007 Number 6 Prize: One year server license IP to country region city database |
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 that show validation text that is easy to guess using common OCR (optical character recognition) programs. This class provides a CAPTCHA alternative that uses animated images. In each animation frame, it is presented a number or the symbol of a simple math operation that the users must solve to pass the validation tests. This solution raises the difficulty to robots in comparison to other CAPTCHA solutions that are easier to defeat by the current generation of robots. Manuel Lemos |
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| Trackback links | ||
| Link | Description |
|---|---|
| Animated Captcha - Image Validation | The easiest way to keep spam bots away... |
| Animierte Captcha Grafik [php] | Der Entwickler Josh Storz hat eine durchaus Interesannte Captcha-Grafik Entwickelt... |
| Comment Spam Killer - Class: Animated CAPTCHA (CAPTCHA, validation, ocr, animated GIF) - PHP | This class can be used to perform CAPTCHA validation presenting to the users simple mathematical... |
| Applications that use this class | ||
| Link | Description |
|---|---|
| STAEP Job Postings | security enhancement for job posting form. |
| Christian Ringtone | captcha in contact form |
| employee scheduling software | Comment script for each school uses Animated CAPTCHA |
If you know an application of this package, send a message to the author to add a link here.| Related links | ||
| Link | Description |
|---|---|
| Animated Gif Captcha Resources | The official launch page of Animated Gif Captcha |
| Files |
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| File | Role | Description | ||
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| frames (15 files) |
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 example.php |
Example | Working Example | ||
| GIFEncoder.class.php |
Class | GIFEncoder class | ||
| index.php |
Example | Main Function - Displays picture & sets session | ||
| OOP4.php |
Class | OOP4 | ||
| OOP5.php |
Class | OOP5 | ||
| readme.txt |
Doc. | readme | ||
| Files | / | frames |
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| File | Role | Description |
|---|---|---|
 0.gif |
Icon | readme |
| 1.gif |
Icon | readme |
| 2.gif |
Icon | readme |
| 3.gif |
Icon | readme |
| 4.gif |
Icon | readme |
| 5.gif |
Icon | readme |
| 6.gif |
Icon | readme |
| 7.gif |
Icon | readme |
| 8.gif |
Icon | readme |
| 9.gif |
Icon | readme |
| equals.gif |
Icon | gif frame |
| minus.gif |
Icon | gif frame |
| plus.gif |
Icon | gif frame |
| solve.gif |
Icon | gif frame |
| times.gif |
Icon | gif frame |
| Download all files: animatedcaptcha.tar.gz animatedcaptcha.zip |
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