In this paper, we present the results of two studies on the influence of mobile devices on authentication performance and password composition. A pre-study in the lab (n = 24) showed a lower performance for password-entry on mobile devices, in particular on smartphones. The main study (n = 450) showed a trend that alphanumeric passwords are increasingly created on smartphones and tablets. Moreover, a negative effect on password security could be observed as users fall back to using passwords that are easier to enter on the respective devices.
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Zezschwitz et al. (2014) studied this question.
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