CAPTCHA: A TOOL FOR WEB SECURITY
Gurpreet Kaur, Dinesh Rai · International Journal of Technical Research & Science · 2021
Malicious computer programs today have tried to target websites, which have a significant effect on their availability and security.The CAPTCHA is a tool that is an efficient way of solving this problem.CAPTCHA is a full automated public turing test.Many human activities are performed on the Internet every day, such as schooling, commerce, conversations etc.Some hackers write programs to automatically make false registrations, for example when registering in websites, that waste web resources while this may even stop the whole website.Thus, human users should be differentiated from CAPTCHA software systems.CAPTCHA handwritten picture may be a work around.In this paper literature review of CAPTCHA has been done in order to enhance our knowledge about how CAPTCHA can provide web security focusing in particular on handwritten CAPTCHA and audio, video CAPTCHA in general.