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Custom CAPTCHA
This class can be used to display images for CAPTCHA validation.
It can display an image with a random text that the user needs to read and enter in a form to authorize the access to resources to real human users. The text is rendered over a given obfuscation image. The length, font and size of the text is configurable.
The validation text is stored in a session variable for posterior validation.
The validation image format can be either GIF, JPEG or PNG.
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