25-04-2012, 12:56 PM
The Design and Analysis of Graphical Passwords
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.INTRODUCTION
Passwords: method of choice for user authentication.
In practice, passwords are susceptible to attacks.
Exploit features of graphical input displays to achieve better security.
TEXT WITH GRAPHICAL ASSISTANCE
Use textual passwords augmented by some graphical capabilities.
Aim: to decouple temporal order & position of input.
DRAW-A-SECRET (DAS) SCHEME
Textual passwords are susceptible to attacks because:
Users do not choose passwords uniformly.
Attackers have significant knowledge about the
distribution of user passwords (users often choose passwords based their own name…)
information about gross properties (words in English dictionary are likely to be chosen)
SUMMARY
Draw-A-Secret (DAS) Scheme:
Pictures are easier to remember
Attackers have no knowledge of the distribution of passwords
Larger password space
Decouple position of inputs from temporal order