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graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
graphical password authentication
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graphical password authentication

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  • 1.
    • Presented by:
    • M.Bhargavi
    • 08Q61A0558
  • 2.
    • Introduction
    • Overview of the Authentication Methods
    • The survey
      • Recognition Based Techniques
      • Recall Based Techniques
    • Discusssion
      • Security
      • Usability
    • Conclusion
  • 3.
    • How about text-based passwords ?
      • Difficulty of remembering passwords
        • easy to remember -> easy to guess
        • hard to guess -> hard to remember
      • Users tend to write passwords down or use the same passwords for different accounts
    • An alternative: Graphical Passwords
      • Psychological studies: Human can remember pictures better than text
  • 4.
    • If the number of possible pictures is sufficiently large, the possible password space may exceed that of text-based schemes, thus offer better resistance to dictionary attacks .
    • can be used to:
      • workstation
      • web log-in application
      • ATM machines
      • mobile devices
  • 5.
    • Conduct a comprehensive survey of the existing graphical password techniques
    • Discuss the strengths and limitations of each method
    • Point out future research directions
  • 6.
    • 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 techeniques
  • 7.
    • 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
    • Recall Based Techniques
      • A user is asked to reproduce something that he created or selected earlier during the registration stage
  • 8.
    • Dhamija and Perrig Scheme
      • Pick several pictures out of many choices, identify them later
      • in authentication.
      • using Hash Visualization, which,
      • given a seed, automatically
      • generate a set of pictures
      • take longer to create graphical
      • passwords
      • password space: N!/K! (N-K)!
      • ( N-total number of pictures; K-number of pictures selected as passwords)
  • 9.
    • 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.
      • authors suggeated using 1000
      • objects, which makes the display
      • very crowed and the objects almost
      • indistinguishable.
      • password space: N!/K! (N-K)!
      • ( N-total number of picture objects; K-number of pre-registered objects)
  • 10.
    • Other Schemes
      • Using human faces as password
      • Select a sequence of images as password
  • 11.
    • 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
  • 12.
    • “ PassPoint” 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 correct sequence.
    • can be hard to remember the
    • sequences
    • Password Space: N^K
    • ( N -the number of pixels or smallest
    • units of a picture, K - the number of
    • Point to be clicked on )
  • 13.
    • Other Schemes
    Grid Selection Scheme Signature Scheme
  • 14. Using distorted images to prevent revealing of passwords Using images with random tracks of geometric graphical shapes
  • 15.
    • Is a graphical password as secure as text-based passwords?
      • text-based passwords have a password space of 94^N
      • (94 – number of printable characters, N- length of passwords).
      • Some graphical password techniques can compete: Draw-A-Secret Scheme,
      • PassPoint Scheme.
      • Brute force search / Dictionary attacks
      • The attack programs need to automatically generate accurate mouse motion
      • to imitate human input, which is more difficult compared to text passwords.
      • Guessing
      • Social engineering
  • 16.
    • Pictures are easier to remember than text strings
    • Password registration and log-in process take too long
    • Require much more storage space than text based passwords
  • 17.
    • main argument for graphical passwords:
    • people are better at memorizing graphical passwords than text-based passwords
    • It is more difficult to break graphical passwords using the traditional attack methods such as:burte force search, dictionary attack or spyware.
    • Not yet widely used, current graphical password techniques are still immature
  • 18.  
  • 19.  

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