ACSAC '05 Proceedings of the 21st Annual Computer Security Applications Conference
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Graphical passwords [Suo et al. 2005] address vital problems of textual passwords: Users pick from a limited vocabulary; machine-generated passwords are hard to memorize. Graphical input, however, faces "shoulder surfing," as bystanders can watch the screen. Current solutions to this problem tend to impose high cognitive loads. We propose an easy-to-handle approach.