A mobile device, which includes a satellite navigation system receiver with embedded confidential seed key for generating Galileo message authentication codes (MACs) for any desired time instant, generates a MAC for a given time instant and transmits the MAC or a derived code as a verification code. A receiving entity authenticates the satellite navigation system receiver by comparing the obtained verification code with an available verification code known to be valid for the given time instant. The satellite navigation system receiver is considered to be an authentic satellite navigation system receiver of a mobile device only, in case the at least one obtained verification code matches the available verification code. Selected further actions are enabled only, if the satellite navigation system receiver is considered an authentic satellite navigation system receiver.