While Washington’s concerns that future 5G wireless networks could be vulnerable to spying have dominated headlines, businesses have long been pushing to make sure the technology is as secure as possible. With fifth-generation wireless networks, or 5G, starting to be rolled out this year, the issue of 5G security was in focus at the Mobile World Congress trade fair which got under way Monday in Barcelona. Unlike upgrades of wireless networks in the past, 5G will deliver not just faster phone and computer data but also help connect up cars, appliances, cargo and crop equipment. 5G’s much faster speeds, vast data capacity and lower latency — or response time — are expected to underpin entirely new technologies such as self-driving cars and telemedicine — which in turn may attract cyberintrusions by criminals or terrorists. “There will be more data which will be transferred…it is clear that security is much more complicated,” said Yannick Sadowy, the director for telecoms and media a...