Uszkoreit, Hans; Macketanz, Vivien; Burchardt, Aljoscha; Harris, Kim; Marheinecke, Katrin; Petrov, Slav; Kayadelen, Tolga; Attia, Mohammed; Elkahky, Ali; Yu, Zhuoran; Pitler, Emily; Lertpradit, Saran; Kirchner, Jesse; Lambertino, Lorenzo; Popel, Martin; Zeman, Daniel; Manning, Christopher; Schuster, Sebastian; Reddy, Siva CC BY-SA 3.0 PUD English Newspaper The world – and by extension the UK – is facing a shortage of people with the skills needed to mount an effective defence. Companies may try to set up a firewall between sensitive systems and foreign powers, but it does not always work. But they can at least lay booby-traps to confuse and deter – a concept known as “active defence”.