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GRAPHICAL PASSWORDAUTHENTICATION
BY,
SHRUTHI
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OVERVIEW OF THE AUTHENTICATIONMethodsToken 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
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TEXT PASSWORDMost common computer authentication method is Text-based
passwords.Drawbacks
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.
Extra processing of memory.
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GRAPHICAL PASSWORDS
An authentication system that works by having the user select
from images, in a specific order, presented in a graphical
user interface (GUI).
The graphical-password approach is sometimes calledgraphical user authentication (GUA).
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RECOGNITION BASED TECHNIQUES
Dhamija and Perrig Scheme
Pick several pictures out of
many choices, identify them
later in authentication.
Take longer to create
graphical passwords
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RECOGNITION BASED TECHNIQUESOther Schemes
Using human faces Select a sequence of
as password images as password
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RECALL BASED TECHNIQUES
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 inauthentication
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RECALL BASED TECHNIQUES
Other schemes
Signature schemes
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RECALL BASED TECHNIQUES
PassPoint Scheme
User click on any place on an image to create a password.
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ADVATAGES OF GRAPHICAL
PASSWORDS Provide a way of making more human-friendly passwords
while increasing the level of security.
On average - millions of years to break into the system
Dictionary attacks and brute force search are infeasible
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DRAWBACKSTHE SHOULDER SURFING PROBLEM
As the name implies, shoulder surfing is watching over people's
shoulders as they process information.
Because of their graphic nature, nearly all graphical password
schemes are quite vulnerable to shoulder surfing. Most of the
existing schemes simply circumvent the problem by stating that
graphical passwords should only be used with handheld devices or
workstations set up in such a way that only one person can see thescreen at the time of login.
However, it is possible to create schemes to counter shoulder
surfing problem
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SOLUTION TO SHOULDER SURFING
PROBLEM
TRIANGLE SCHEME (CONVEX HULL SCHEME)
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MOVABLE FRAME SCHEME
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CONCLUSION Graphical passwords are an alternative to textual
alphanumeric password.
It satisfies both conflicting requirements i.e. it is easy to
remember & it is hard to guess.
By the solution of the shoulder surfing problem, it becomes
more secure & easier password scheme.
By implementing other special geometric configurations like
triangle & movable frame, one can achieve more security.
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THANK YOU
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4/22/2013 Free template from www.brainybetty.com 18