A DETAILED EXPLANATION OF THE CAPTCHA TO IMPROVE SECURITY.

This paper proposes the latest attacks which are been done in the internet. It explains how these various attacks can be stopped by using various techniques of captcha. There are various types of captcha available nowadays. This paper explains how we can improve the internet security by using the advance captcha. There are two types of captcha which we have seen they are: Numerical captcha and image captcha. In this paper we explain about the advance version of captcha like the motion graphical captcha, pictorial captcha. These captcha can be used for various purposes. It can be used for email verification, bank details verification and even for other payment options. These captcha increases the security from getting the websites hacked.