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Welcome to the south coast of england, and the countrys biggest fortification, dover castle. They say a british mans house is his 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 constantly under attack. The walls may keep out burglars, but todays digital invader is wily and can worm its way in through the smallest gaps. Last weeks global cyber attack on companies in around 150 countries shows just how vulnerable systems can be, even if you are not fooled into clicking dodgy links. So this week, were looking at cyber security. Its me versus the bad guys out there. And they might be small, but theres a lot of them. So what can i do to shore up my defences . One way is through biometrics. Gadgets already recognise our fingerprint, and now banks are starting to identify us by using our voices. So, how secure is it . Is it possible, for example, to pick someones voice . We asked dan simmons to give it a go or ....