Secure Authentication Model using Grid based Graphical Images with Three Way Validation

The most common computer authentication method is to use text usernames and passwords which have various drawbacks. For example users tend to pick passwords that can be easily guessed. On the other hand, if a password is hard to guess, then it is often hard to remember. This paper provides additional layer of security to normal textual password by using graphical password for authenticating the user. As graphical passwords are vulnerable to shoulder surfing attack so we will send one-time generated password to users and even send credentials to users authorized email-id. Using the instant messaging service available in internet, user will obtain the One Time Password (OTP)