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Graphical password authentication


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  • 1. Presented by: Anilaja CSE
  • 2.  What is PASSWORD? PASSWORD is a secret word or string of characters that is used for user authentication to prove his identity and gain access to resources.  Uses of Password:  Logging into accounts.  Retrieving emails.  Accessing applications.  Networks.  Websites  Databases
  • 3. Authentication is a process of conformation of a persons identity. Types:  Token based authentication  key cards, band cards, smart card, …  Biometric based authentication  Fingerprints, iris scan, facial recognition, …  Knowledge based authentication  text-based passwords, picture-based passwords, …  most widely used authentication techniques
  • 4.  Text password is a secret word or string of characters that is used for user authentication to prove his identity and gain access to resources.  Difficulty of remembering passwords  easy to remember -> easy to guess  hard to guess -> hard to remember
  • 5. 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 sometimes called graphical user authentication (GUA). An example of a graphical password uses an image on the screen and lets the user choose a few click points; these click points are the "password", and the user has to click closely to these points again in order to log in.
  • 6.  Recall Based Techniques A user is asked to reproduce something that he created or selected earlier during the registration stage  Recognition Based Techniques A user is presented with a set of images and the user passes the authentication by recognizing and identifying the images he selected during the registration stage.  Cued-recall Technique An extra cue is provided to users to remember and target specific locations within a presented image.
  • 7.  Draw-A-Secret (DAS) Scheme User draws a simple picture on a 2D grid, the coordinates of the grids occupied by the picture are stored in the order of drawing Redrawing has to touch the same grids in the same sequence in authentication. User studies showed the drawing sequences is hard to remember.
  • 8.  Signature scheme Here authentication is conducted by having the user drawing their signature using a mouse.
  • 9.  Pass Point Scheme User click on any place on an image to create a password. A tolerance around each chosen pixel is calculated. In order to be authenticated, user must click within the tolerances in the correct sequence.
  • 10. B-DAS Scheme Grid Selection Scheme
  • 11.  Dhamija and Perrig Scheme Pick several pictures out of many choices, identify them later in authentication.
  • 12.  Sobrado and Birget Scheme System display a number of pass-objects (pre-selected by user) among many other objects, user click inside the convex hull bounded by pass-objects.
  • 13.  Pass face scheme: In this technique human faces are used as password.
  • 14.  Other Schemes Select a sequence of images as password
  • 15.  Graphical password schemes provide a way of making more human-friendly passwords while increasing the level of security.  Here the security of the system is very high.  Dictionary attacks and brute force search are infeasible.
  • 16.  Password registration and log-in process take too long.  Require much more storage space than text based passwords.  Shoulder Surfing .