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Mecke, Lukas; Buschek, Daniel; Kiermeier, Mathias; Prange, Sarah and Alt, Florian (2019): Exploring Intentional Behaviour Modifications for Password Typing on Mobile Touchscreen Devices. In: Proceedings of the Fifteenth Symposium on Usable Privacy and Security (Soups 2019): pp. 303-317

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Behavioural biometric systems are based on the premise that human behaviour is hard to intentionally change and imitate. So far, changing input behaviour has been studied with the goal of supporting mimicry attacks. Going beyond attacks, this paper presents the first study on understanding users' ability to modify their typing behaviour when entering passwords on smartphones. In a prestudy (N=114), we developed visual text annotations to communicate modifications of typing behaviour (for example, gap between letters indicates how fast to move between keys). In a lab study (N=24), participants entered given passwords with such modification instructions on a smartphone in two sessions a week apart. Our results show that users successfully control and modify typing features (flight time, hold time, touch area, touch-to-key offset), yet certain combinations are challenging. We discuss implications for usability and security of mobile passwords, such as informing behavioural biometrics for password entry, and extending the password space through explicit modifications.

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