We see the popular "captcha" security mechanism often - wavy letters websites ask us to type into a box. It's used by web pages and newsletter sign-up forms to prevent computer robots from hacking ...

How do you let people create user accounts or post comments on your Web site without letting spam bots in? Simple — make your users prove they’re human. Many Web sites use CAPTCHA (Completely ...

Apple took several steps toward a password-free future at its Worldwide Developer Conference, but another component of its strategy will be to replace CAPTCHA (Completely Automated Public Turing Test ...