REVIEW ON CAPTCHA
Keywords:
CAPTCHA securityAbstract
CAPTCHA is stands for “Completely Automated Public Turing test tell Computers and
Apart.”Actually Captcha is used as a simple Puzzle hurdle which restricted various automated programs to
sing-up E-mail accounts, it is challenges a particular automated program, which is trying to access some
private zone.Actually CAPTCHA is simply some visual test or some simple puzzle. Any human can crack this
challenge easily so this CAPTCHA basically distinguishes human and automated programs to do violation of
some Private area. The CPTCHA tests include some code in form of some images,letters,and alphabates.