fortification, though the castle. —— dover castle. this week, this castle is mine. like every other home in the land, it needs to be well defended, because these days, it is co nsta ntly defended, because these days, it is constantly under attack. the walls make it out burglars, but today's digital invader can worm its way in through the smallest gaps. last week's global cyber attack on companies in around 150 countries shows just how vulnerable systems can be, even if you are not called into clicking dodgy links. so this week, we are looking at cybersecurity. it is me versus the bad guys out there. and they might be small, but there are a lot of them. so what can i do to shore up my defences? 0ne them. so what can i do to shore up my defences? one thing is to use biometrics. gadgets already recognise our fingerprint, and biometrics. gadgets already recognise ourfingerprint, and now banks are starting to use our voices. so how secure is it? is it possible, for example, to...