We investigate improvements to authentication on mobile touchscreen phones and present a novel extension to the widely used\ntouchscreen pattern lock mechanism. Our solution allows including nodes in the grid multiple times, which enhances the resilience\nto smudge and other forms of attack. For example, for a smudge pattern covering 7 nodes, our approach increases the amount of\npossible lock patterns by a factor of 15 times.Our concept was implemented and evaluated in a laboratory user test (
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