Jonathan Liebers, Patrick Laskowski, Florian Rademaker, Leon Sabel, Jordan Hoppen, Uwe Gruenefeld, and Stefan Schneegass. 2024. Kinetic Signatures: A Systematic Investigation of Movement-Based User Identification in Virtual Reality. In Proceedings of the CHI Conference on Human Factors in Computing Systems (CHI '24). Association for Computing Machinery, New York, NY, USA, Article 783, 1–19. https://doi.org/10.1145/3613904.3642471

Jonathan Liebers, Sasha Brockel, Uwe Gruenefeld, and Stefan Schneegass. 2022. Identifying Users by Their Hand Tracking Data in Augmented and Virtual Reality. International Journal of Human–Computer Interaction, 40(2), 409–424. Tylor & Francis https://doi.org/10.1080/10447318.2022.2120845

Jonathan Liebers, Christian Burschik, Uwe Gruenefeld, and Stefan Schneegass. 2023. Exploring the Stability of Behavioral Biometrics in Virtual Reality in a Remote Field Study: Towards Implicit and Continuous User Identification through Body Movements. In Proceedings of the 29th ACM Symposium on Virtual Reality Software and Technology (VRST '23). Association for Computing Machinery, New York, NY, USA, Article 30, 1–12. https://doi.org/10.1145/3611659.3615696

Alia Saad, Kian Izadi, Anam Ahmad Khan, Pascal Knierim, Stefan Schneegass, Florian Alt, and Yomna Abdelrahman. 2023. HotFoot: Foot-Based User Identification Using Thermal Imaging. In Proceedings of the 2023 CHI Conference on Human Factors in Computing Systems (CHI '23). Association for Computing Machinery, New York, NY, USA, Article 262, 1–13. https://doi.org/10.1145/3544548.3580924

Jonathan Liebers, Uwe Gruenefeld, Daniel Buschek, Florian Alt, and Stefan Schneegass. 2023. Introduction to Authentication using Behavioral Biometrics. In Extended Abstracts of the 2023 CHI Conference on Human Factors in Computing Systems (CHI EA '23). Association for Computing Machinery, New York, NY, USA, Article 547, 1–4. https://doi.org/10.1145/3544549.3574190

Stefan Schneegass, Alia Saad, Roman Heger, Sarah Delgado Rodriguez, Romina Poguntke, and Florian Alt. 2022. An Investigation of Shoulder Surfing Attacks on Touch-Based Unlock Events. Proc. ACM Hum.-Comput. Interact. 6, MHCI, Article 207 (September 2022), 14 pages. https://doi.org/10.1145/3546742

Alia Saad, Nick Wittig, Uwe Gruenefeld and Stefan Schneegass. 2022. A Systematic Analysis of External Factors Affecting Gait Identification. IEEE International Joint Conference on Biometrics (IJCB), Abu Dhabi, United Arab Emirates, pp. 1-9, doi: 10.1109/IJCB54206.2022.10007994.

Yasmeen Abdrabou, Sheikh Radiah Rivu, Tarek Ammar, Jonathan Liebers, Alia Saad, Carina Liebers, Uwe Gruenefeld, Pascal Knierim, Mohamed Khamis, Ville Makela, Stefan Schneegass, and Florian Alt. 2022. Understanding Shoulder Surfer Behavior and Attack Patterns Using Virtual Reality. In Proceedings of the 2022 International Conference on Advanced Visual Interfaces (AVI 2022). Association for Computing Machinery, New York, NY, USA, Article 15, 1–9. https://doi.org/10.1145/3531073.3531106

Jonathan Liebers, Mark Abdelaziz, Lukas Mecke, Alia Saad, Jonas Auda, Uwe Gruenefeld, Florian Alt, and Stefan Schneegass. 2021. Understanding User Identification in Virtual Reality Through Behavioral Biometrics and the Effect of Body Normalization. In Proceedings of the 2021 CHI Conference on Human Factors in Computing Systems (CHI '21). Association for Computing Machinery, New York, NY, USA, Article 517, 1–11. https://doi.org/10.1145/3411764.3445528

Alia Saad, Jonathan Liebers, Uwe Gruenefeld, Florian Alt, and Stefan Schneegass. 2021. Understanding Bystanders’ Tendency to Shoulder Surf Smartphones Using 360-degree Videos in Virtual Reality. In Proceedings of the 23rd International Conference on Mobile Human-Computer Interaction (MobileHCI '21). Association for Computing Machinery, New York, NY, USA, Article 35, 1–8. https://doi.org/10.1145/3447526.3472058

Jonathan Liebers, Patrick Horn, Christian Burschik, Uwe Gruenefeld, and Stefan Schneegass. 2021. Using Gaze Behavior and Head Orientation for Implicit Identification in Virtual Reality. In Proceedings of the 27th ACM Symposium on Virtual Reality Software and Technology (VRST '21). Association for Computing Machinery, New York, NY, USA, Article 22, 1–9. https://doi.org/10.1145/3489849.3489880

Mihai Bâce, Alia Saad, Mohamed Khamis, Stefan Schneegass, and Andreas Bulling. 2022. PrivacyScout: Assessing Vulnerability to Shoulder Surfing on Mobile Devices. Proceedings on Privacy Enhancing Technologies, 1, 21. 

Sarah Faltaous, Jonathan Liebers, Yomna Abdelrahman, Florian Alt, and Stefan Schneegass. 2019. VPID: Towards Vein Pattern Identification Using Thermal Imaging. i-com, 18(3), 259-270. https://doi.org/10.1515/icom-2019-0009 

Yomna Abdelrahman, Mohamed Khamis, Stefan Schneegass, and Florian Alt. 2017. Stay Cool! Understanding Thermal Attacks on Mobile-based User Authentication. In Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems (CHI '17). Association for Computing Machinery, New York, NY, USA, 3751–3763. https://doi.org/10.1145/3025453.3025461

Stefan Schneegass, Youssef Oualil, and Andreas Bulling. 2016. SkullConduct: Biometric User Identification on Eyewear Computers Using Bone Conduction Through the Skull. In Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems (CHI '16). Association for Computing Machinery, New York, NY, USA, 1379–1384. https://doi.org/10.1145/2858036.2858152