How Does CAPTCHA Work

A CAPTCHA is a type of challenge-response Recaptcha V2 system designed to differentiate humans from robotic computer programs. CAPTCHAs are used as security checks to deter spammers and hackers from using forms on web pages to insert malicious or frivolous code.To solve the problem, Andrei Broder, formerly AltaVista's chief scientist, developed an algorithm that randomly generated an image of printed text.

Quite simply, CAPTCHA works by asking end users to perform some task that a software bot cannot do. If the user can do the task correctly, it provides authentication to the service that the user is a human being and not a spambot and allows the user to continue.The need for CAPTCHAs began as far back as 1997. At that time, the internet search engine AltaVista was looking for a way to block automated URL submissions to the platform that were skewing the search engine's ranking algorithms.