Impact of Background Images on the DAS (Draw- A- Secret) Graphical Password Authentication Scheme

The basic idea of DrawA Secret technique is that a user is asked to draw a simple picture on a 2D grid. The coordinates of the grid, occupied by the picture are stored in the order of the drawing. During authentication, the user is asked to re-draw the picture. If the drawing touches the same grids in the same sequence, then the user is authenticated. But sometimes user fails to recall his/her password during the registration process. In the proposed work we are applying A Background image with das scheme to increase the remembrance of passwords. The basic idea behind the scheme is that the human nature that he or she can recognize pictures easily then the 2 d grids. General Terms Back ground images, Graphical password, Draw-aSecret, Authentication 1-INTRODUCTION It is very commonly existence of alphanumeric passwords for use authentication as it was not so much secure for the users so the enhancement occurred in the form of graphical passwords. Many people find it difficult to remember password, and they tend to choose easily passwords. Many of the decencies of textual passwords arise from the limitation of human memory[4].Graphical password can be categorized in to two parts that is recognition based and recall based.[1]. Das scheme comes under the recall based technique in which user’s password is free-from drawing from produced on an NXN grid. This technique is alphabet independent [2]. Das has some features like it has the larger password space larger than the textual schemes. Second advantage is that it is not only use for user authentication but the technique can also be used for the cryptographic key generation. In this paper we are presenting the new approach for the DAS with the help of background image. The implementation of background image will be useful for the users to remember their passwords generated by the DAS technique, a user will first choose a background image to be overlaid by the grid, and then draw their secret as in DAS. Background image would encourage users to choose more complicated passwords, which are usually less [8]. Vulnerable to dictionary and other guess attacks also this will help user to memorize their passwords. In our study result shows that user using background images for DAS can set less predictable but more complicated passwords for attackers. Background images also improved password memorability. 1.