Abstract: A method for secured data transmission of visually encoded data from a mobile end device to a processing unit includes supplying on a security element of the end device a datum to be transmitted. The datum is encrypted in session-specific fashion through the security element. From the encrypted datum visually encoded image data are generated in the form of a bar code or a sequence of bar codes. The visually encoded image data are displayed through the end device.

Abstract: A method for implementing security rules in a terminal device is provided with a first secure element and one or more second secure elements comprises the step of sending predetermined commands by the first secure element to the terminal device. The first secure element monitors the compliance with predetermined security rules with respect to information concerning the one or more second secure elements and uses the predetermined commands as part of the monitoring.

Abstract: A method for supplying visually encoded image data for displaying through a mobile end device includes supplying a datum. A device type of the end device is ascertained on the basis of a user identity which is assigned to a security element integrated into the end device. On the basis of the device type of the end device, the device properties of the end device are ascertained which influence a displaying of visually encoded image data on the end device. On the basis of the ascertained device properties, an image data representation information item is generated for generating visually encoded image data for the end device in device-specific fashion. Finally, the visually encoded image data are generated based on the image data representation information item in device-specific fashion for representing the datum on the end device.

Abstract: A method for secured data transmission of visually encoded data from a mobile end device to a processing unit includes supplying on a security element of the end device a datum to be transmitted. The datum is encrypted in session-specific fashion through the security element. From the encrypted datum visually encoded image data are generated in the form of a bar code or a sequence of bar codes. The visually encoded image data are displayed through the end device.

Abstract: A method for supplying visually encoded image data for displaying through a mobile end device includes supplying a datum. A device type of the end device is ascertained on the basis of a user identity which is assigned to a security element integrated into the end device. On the basis of the device type of the end device, the device properties of the end device are ascertained which influence a displaying of visually encoded image data on the end device. On the basis of the ascertained device properties, an image data representation information item is generated for generating visually encoded image data for the end device in device-specific fashion. Finally, the visually encoded image data are generated based on the image data representation information item in device-specific fashion for representing the datum on the end device.