There is disclosed a data processing device for executing an application, the data processing device comprising a processing unit for controlling access to at least one user interface comprised in the data processing device, and a secure element for facilitating secure execution of the application, wherein executing the application comprises receiving input data from and/or sending output data to the user interface, and wherein the secure element is arranged to cause the processing unit to restrict the access to the user interface during execution of the application. Furthermore, a corresponding method for executing an application and a corresponding computer program product are disclosed.