Hackers are making millions from ransomware attacks. What can be done to stop them? Ed Butler speaks to professional ransomware negotiator Kurtis Minder, about the increasing professionalisation of the ransomware business. Kimberly Grauer, head of research at Chainalysis explains why following the bitcoin trail may be the best way of bringing ransomware gangs to justice and Vishaal Hariprasad, boss of cyber insurance company Resilience, tells us why the ransomware threat means there needs to be a stepchange in how companies view cyber security.