HKCaptcha is a PHP script for Security Systems scripts design by lagom.nl.
It runs on following operating system: Windows / Linux / Mac OS / BSD / Solaris. HKCaptcha is yet another captcha implementation in PHP.
Publisher review: HKCaptcha is yet another captcha implementation in PHP. HKCaptcha is yet another captcha implementation in PHP. This one is written with the current state of captcha-defeating research (as of 2007) in mind. Apart from a mathematical letter distortion algorithm that is more than just rotating the letters (just like on the big websites such as Google and Yahoo), the clutter is designed to make segmentation of the image into separate letter glyphs hard to do automatically. Finally, the images contain the name of the originating website to discourage re-using them on porn sites. The PHP script 'captcha-image.php' will generate a PNG with a distorted five-letter code. The code is stored into the PHP session variable $_SESSION['captcha_string']; The distortion algorithm is computationally intensive and PHP is not exactly suited for that job. It may take a second or so of CPU time to generate an image. This should not be a problem on small sites. Operating system: Windows / Linux / Mac OS / BSD / Solaris
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HKCaptcha script details 
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