In some websites (let's take yahoo mail for example), when we want to register as new user, the site (yahoo) give us a distorted image, and we must enter
string in that distorted image to validate us.
Actually, what is it for?I suggest that's for security (maybe to avoid something like "auto-register-bot"?). Am I correct?
What is the logic behind such a security prevention? How can we implement it using
JSF?
Thanks