"It's Just a Lot of Prerequisites": A User Perception and Usability Analysis of the German ID Card as a FIDO2 Authenticator. - Markus Keil; Philipp Markert; Markus Dürmuth (EuroUSEC, 2022)

"If You Want to Encrypt It Really, Really Hardcore...": User Perceptions of Key Transparency in WhatsApp. - Konstantin Fischer; Markus Keil; Annalina Buckmann; M. Angela Sasse (Proc. Priv. Enhancing Technol., 2025)