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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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