A ‘Captcha’ is a response test used on computers to verify whether the user is human. The most commonly used captcha requires the user to type/input the letters and numbers displayed on a distorted kind of image. This is because of the fact that only humans cannot extract letters or numbers from an image and not the robots/ computer. Captcha has now become an essential part of every website because of the increase in spamming day to day. As already known, spammers create special scripts that automatically crawl within web pages and are capable of submitting forms automatically. Captcha serves as an effective tool in countering with this kind of spamming.
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