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A method is provided for registration of a device as a Network Application Function, NAF, in a Generic Boot strapping Architecture, GBA. The device performs a GBA bootstrap operation with a Bootstrapping Server Function, BSF, and sends to a NAF registration function a request to register as a NAF. The device receives NAF registration information from the NAF registration function, and per forms a NAF registration with the BSF. The NAF registra tion function receives from the device a request to register as a NAF, confirms that that the device is authorised to act as a NAF, and transmits the NAF registration information to the device.