When it comes to bandwidth, 5G is like having your cake and eating it too, in this case the cake is double chocolate, no fat*. You get the connection speeds of fiber, but without the tether of a chord. The great aspect from a cyber security perspective is that you have more bandwidth to build secure applications. Encryption sucks up bandwidth, and 5G allows you to increase the security of the conversation without sacrificing the quality of the transmission.
All that is good, but there are some serious issues especially around network security. 5G will push bandwidth even higher up the tech hierarchy of needs. This means that the network equipment that the mobile operators use to power 5G has to be secure and impenetrable to malicious attacks by nation states. This will have to start at the supply chain where every aspect of the network equipment manufactured is secure, transparent, and predictable. That is the true 5G challenge facing the industry today.
*Thanks to Ronan Dunne for that analogy