Graphical Password Authentication

Abstract : A graphical password is an authentication system that works by having the user select from images, in a specific order, presented in a graphical user interface (GUI). For this reason, the graphical-password approach is called graphical user authentication (GUA). The most common computer authentication method is to use alphanumerical usernames and passwords. This method has been shown to have significant disadvantages. For e.g, users tend to choose passwords that can be easily guessed. On the other hand, if a password is difficult to guess, then it is often difficult to remember. To overcome this problem of low security, Authentication methods are developed by researchers that use images as password. In this research paper, we conduct a comprehensive survey of the existing graphical password techniques and provide a possible theory of our own. Graphical password schemes have been proposed as a possible alternative to text-based schemes, by the fact that humans can remember pictures better than text; Pictures are generally easier to be remembered or recognized than text.
 EXISTING SYSTEM :
 ? In this research paper, we conduct a comprehensive survey of the existing graphical password techniques and provide a possible theory of our own. ? Graphical password schemes can be divided into three major categories based on the type of activity required to remember the password: recognition, recall, and cued recall. ? Recognition is the easiest for human memory whereas pure recall is most difficult since the information must be accessed from memory with no triggers.
 DISADVANTAGE :
 ? It avoids the well known hot spot problem of the old graphical password authentication systems. ? One of the best password authentication systems was text based or alphanumerical based password has several problems. ? One of the main problem with text based password is it was ridicules to remember several text password for different account. ? To overcome the disadvantage of the pass point authentication system the cued click point is invented.
 PROPOSED SYSTEM :
 • Several techniques have been proposed to reduce the limitations of alphanumerical password. • One proposed solution is to use an easy to remember long phrases (passphrase) rather than a single word. • In the proposed system, a user freely chooses a picture, POIs and corresponding words. • The user then chooses several point-of-interest (POI) regions in the picture. Each POI is described by a circle (center and radius).
 ADVANTAGE :
 ? Cued click point is very efficient to user to remember and recognize the password with the help of smart GUI. ? The human brain is very efficient to remember the graphical passwords than of the text based passwords. ? Graphical passwords schemes provide a way of making more human friendly passwords. ? Here the security of the system is very high. ? Dictionary attacks and brute force search are infeasible.

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