Security professionals love to talk about attack surfaces and that phrase has become almost a cliché in the context of 5G and the IoT (Internet of Things). It refers to sources of threats to a particular system and by definition is largely a function of connectivity and access. If a device or system has no connectivity than security threats such as tampering, theft of data, or denial of service, are confined to hackers who can gain physical access to it. That is one reason why the IoT has attracted attention from hackers and become a growing source of concern as devices that were previously unconnected become remotely accessible, alongside new ones with in-built communications from the outset. Then as communication…