Authentication Using Graphical Passwords: Effects of Tolerance and Image Choice

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Authentication Using Graphical Passwords: Effects of Tolerance and Image Choice (2005)

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by Susan Wiedenbeck , Jim Waters , Alex Brodskiy , Nasir Memon

Venue:	In First Symposium on Usable Privacy and Security (SOUPS 2005
Citations:	79 - 0 self

BibTeX

@INPROCEEDINGS{Wiedenbeck05authenticationusing,
    author = {Susan Wiedenbeck and Jim Waters and Alex Brodskiy and Nasir Memon},
    title = {Authentication Using Graphical Passwords: Effects of Tolerance and Image Choice},
    booktitle = {In First Symposium on Usable Privacy and Security (SOUPS 2005},
    year = {2005},
    pages = {1--12},
    publisher = {ACM Press}
}

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Abstract

Graphical passwords are an alternative to alphanumeric passwords in which users click on images to authenticate themselves rather than type alphanumeric strings. We have developed one such system, called PassPoints, and evaluated it with human users. The results of the evaluation were promising with respect to rmemorability of the graphical password. In this study we expand our human factors testing by studying two issues: the effect of tolerance, or margin of error, in clicking on the password points and the effect of the image used in the password system. In our tolerance study, results show that accurate memory for the password is strongly reduced when using a small tolerance (10 х 10 pixels) around the user’s password points. This may occur because users fail to encode the password points in memory in the precise manner that is necessary to remember the password over a lapse of time. In our image study we compared user performance on four everyday images. The results indicate that there were few significant differences in performance of the images. This preliminary result suggests that many images may support memorability in graphical password systems.

Keyphrases

authentication using graphical password image choice graphical password password point accurate memory human user image study user password point precise manner password system small tolerance user performance alphanumeric password tolerance study human factor graphical password system preliminary result significant difference everyday image many image alphanumeric string

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