With SeCuUI we present a solution that aims to increase security of data entry on public terminals. The user can enter all data requested by the terminal using her mobile device. Sensitive data can be hidden from prying eyes by exclusively showing it on the user’s mobile. To speed up the whole process, the SeCuUI-client stores previously entered data on the mobile device to provide auto form filling capabilities. Keywords Security, privacy, mobile phones, public terminals. Categories and Subject Descriptors H.5.2 [Information interfaces and presentation (e.g., HCI)]: User Interfaces—Input devices and strategies, evaluation