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PassImages : an alternative method of user authentication
Charruau D, Furnell SM, Dowland PS
Proceedings of the ISOneWorld 2005, Las Vegas, USA, 30 March - 1 April, 2005
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This paper presents an assessment of an alternative to the predominant password and
PIN-based methods of user authentication. Although these approaches are in
widespread use, there are many recognised problems in terms of their usage and the
consequent protection that they actually provide. Therefore a graphical method using
PassImages has been created in which users are authenticated from the selection of six
images, chosen from a set of one hundred. A trial of the technique has been
conducted via a prototype implementation of a web-based authentication process.
This assessment shows that the PassImage approach provides a high level of
effectiveness, with 29 trial users achieving 95% successful authentication.

Charruau D, Furnell SM, Dowland PS