» Demo
Captchas are to differentiate between human users and bots. Therefore we fish for abilities of human beings which can't simulate by a programm in a simple way. One of these abilities is to distinguish some body parts from others. Thats the strategy of this captcha. You can customize it to use variable count of pictures to increase security. Supplementary the script dislocates the picture and randomizes the compression factor everytime a new captcha is generated. The script is implemented as a server side imagemap, so you can use this captcha like a submit button in common forms.
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