Mobile user device and method of communication over a wireless medium

A mobile user device, configured to communicate over a wireless medium and a corresponding computer-implemented method is described. The mobile user device in one embodiment may comprise a near field communication interface for at least sending response information to a receiver in one or more near field transmissions; and a communication control module, connected with said near field communication interface. To improve the security of the mobile user device, the communication control module is configured to control whether said response information is sent by said near field communication interface in dependence of at least a communication safety parameter.