A Review of Captcha and Graphical Passwords to Enhance Security and Usability to Next Level

Sometimes user will have to go through extra exhaustive steps for registration as well as login as far as security issues are concerns. These registration steps are influenced with some Artificial Intelligence logics and some tedious mathematical calculations which make login process more secure. Though security of particular user is extended to some level it requires some extra jugglery for registration and login which may be a long process for users. Hence there must be system with an easy and effective approach to solve the problem of long process of registration and login which extends security level to next extend. To extend this security to next level new area is in limelight named Captcha as graphical password. Captcha is basically challenge and response technique designed to differentiate humans from automated programs. It contains some tasks which are easy to humans and difficult to bots. Hence new schemes should be explored for registration and login process and simplified with captcha as graphical password schemes. These new schemes must be explored in such a way so that online guessing attacks, shoulder-surfing attacks, relay attacks etc. should get solutions. Hence by using captcha as graphical password schemes, system should be strong enough as far as security is concern.