Web Applications > MyCaptcha Challenge-Response Test
A Captcha is a challenge-response used in web forms to ensure the user is human, and not a web bot.
I originally developed MyCaptcha for GreenCard Immigration USA. The "Refer an Associate" page contains an email form for visitors to email a comment and the site's URL to a friend.
MyCaptcha's encryption and algorithm can be customized for each web page in a site, and for different web sites.