Class: OCR CAPTCHA
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| Detailed description | ||
| This class is meant to generate CAPTCHA (Completely Automated Public Turing to tell Computers from Humans Apart) images to test whether the user accessing a site is a real human or an automatic script. The class generate an image with a random key text string printed on it mixed with some noise made of random text characters or line grid. The image is meant to be used in a form so the user reads the key text in the image and must enter it to prove that is a real human. The form also passes an hidden field that contains a public key that is used when the form is submitted to the server to verify whether the key text on the image matches what the user entered. |
| Groups | ||
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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 |
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