The weekend of 12-14 May 2017 saw a mass outbreak of a malicious software virus which aimed to lock data files and hold them to ransom. Within three days the virus, dubbed “WannaCrypt”, had been halted, but the damage was done; businesses and services and government departments across the world were taken down, unable to operate properly until they had either paid the ransom or implemented costly, time-consuming recovery efforts. This kind of malicious software, known as “ransomware”, is not…