Innovation Award
June 2007
Number 6 |
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 |
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.
| Ratings | Utility |
Consistency |
Documentation |
Examples |
Tests |
Videos |
Overall |
Rank |
| All time: |
Good (85.0%) |
Good (86.7%) |
Good (85.0%) |
Good (86.7%) |
- |
- |
Sufficient (68.3%) |
230 |
| Month: |
Not yet rated by the users |
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