State-of-the-art authentication does little to account for the way in which users interact. For example, knowledge-based authentication schemes such as PIN, lock patterns, or passwords were invented at times where people authenticated with very few devices and only a few times per day. At the same time, as a result of crowd services and smart devices, users today access sensitive information through 100 accounts on average and authenticate several hundres times a day. This leads to a significant overhead in authentication times and users are forced to use more passwords than they can remember.

In contrast, implicit authentication schemes hold a lot of promise as they can operate seemlessly in the background. In particular, we look at how knowledge about users' behavior can be leveraged to build authentication schemes that are both more usable and more secure. We are interested in the technical foundations of such schemes (How can we build suitable authentication models? How can we use them across applications and contexts?) and in the users' view (How can implicit mechanisms be built that preserve users' privacy? How can the acceptance of users' be increased?).

Publications

braun2019chi.jpg Michael Braun, Anja Mainz, Ronee Chadowitz, Bastian Pfleging and Florian Alt. At Your Service: Designing Voice AssistantPersonalities to Improve Automotive User Interfaces. In Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems. CHI '19. ACM, New York, NY, USA. [Download Bibtex]
pfeuffer2019chi.jpg Ken Pfeuffer, Matthias Geiger, Sarah Prange, Lukas Mecke, Daniel Buschek and Florian Alt. Behavioural Biometrics in VR - Identifying People from Body Motion and Relations in Virtual Reality. In Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems. CHI '19. ACM, New York, NY, USA. [Download Bibtex]
abdrabou2018mum2.jpg Yasmeen Abdrabou, Nadeen Mourad and Amr Elmougy. Exploring the Scalability of Behavioral Mid-air Gestures Authentication. In Proceedings of the 17th International Conference on Mobile and Ubiquitous Multimedia. MUM 2018. ACM, New York, NY, USA. [Download Bibtex]
buschek2018chi1.jpg Daniel Buschek, Bianka Roppelt and Florian Alt. Extending Keyboard Shortcuts with Arm and Wrist Rotation Gestures. In Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems. CHI '18. ACM, New York, NY, USA. [Download Bibtex] [Video]
buschek2018chi2.jpg Daniel Buschek, Benjamin Bisinger and Florian Alt. ResearchIME: A Mobile Keyboard Application for Studying Free Typing Behaviour in the Wild. In Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems. CHI '18. ACM, New York, NY, USA. [Download Bibtex]
buschek2018iui.jpg Daniel Buschek. A Model for Detecting and Locating Behaviour Changes in Mobile Touch Targeting Sequences. In 23rd International Conference on Intelligent User Interfaces. IUI '18. ACM, New York, NY, USA. [Download Bibtex]
mecke2018chiea.jpg Lukas Mecke, Sarah Prange, Daniel Buschek and Florian Alt. A Design Space for Security Indicators for Behavioural Biometrics on Mobile Touchscreen Devices. In Extended Abstracts of the 2018 CHI Conference on Human Factors in Computing Systems. CHI EA '18. ACM, New York, NY, USA. [Download Bibtex]
mecke2018mum.jpg Lukas Mecke, Ken Pfeuffer, Sarah Prange and Florian Alt. Open Sesame!: User Perception of Physical, Biometric, and Behavioural Authentication Concepts to Open Doors. In Proceedings of the 17th International Conference on Mobile and Ubiquitous Multimedia. MUM'18. ACM, New York, NY, USA. [Download Bibtex]
prange2018mum.jpg Sarah Prange, Daniel Buschek and Florian Alt. An Exploratory Study on Correlations of Hand Size and Mobile Touch Interactions. In Proceedings of the 17th International Conference on Mobile and Ubiquitous Multimedia. MUM'18. ACM, New York, NY, USA. [Download Bibtex]
buschek2017imwut.jpg Daniel Buschek, Julia Kinshofer and Florian Alt. A Comparative Evaluation of Spatial Targeting Behaviour Patterns for Finger and Stylus Tapping on Mobile Touchscreen Devices. ACM, New York, NY, USA. [Download Bibtex]
buschek2016chi2.jpg Daniel Buschek, Alexander De Luca and Florian Alt. Evaluating the Influence of Targets and Hand Postures on Touch-based Behavioural Biometrics. In Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems. CHI '16. ACM, New York, NY, USA. [Download Bibtex]
buschek2015chi.jpg Daniel Buschek, Alexander De Luca and Florian Alt. Improving Accuracy, Applicability and Usability of Keystroke Biometrics on Mobile Touchscreen Devices. In Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems. CHI '15. ACM, New York, NY, USA. [Download Bibtex]