Confidential data and even human lives are at risk thanks to the huge spread of connected technology in healthcare.
Mayhem, not money, seems to be the ultimate aim of the latest attack unleashed on computer networks around the world.
Movies tell us that paying a ransom means the bad guys win, but in the real world it's not that simple.
It can be useful to think of hackers as burglars and malicious software as their burglary tools. Both types of miscreants want to find ways into secure places and have many options for entry.
What's the best way for spy agencies to protect the public: secretly exploit software flaws to gather intelligence, or warn the world and avert malicious cyberattacks?
The cyber-attack hit 200,000 computers and a number of big global organisations. But it hasn't made much in ransom money.
Things might not be over for the WannaCry malware.
Small businesses are the forgotten casualties of the recent WannaCry ransomware attack.
The underground market for software vulnerabilities has been growing steadily since the 1990s, so the latest WannaCry could be a sign of things to come.
People don't want to endure the interruptions and inconveniences of keeping their computer software up to date. Research tells us why, and how we might fix the problem – and protect ourselves.
"It is time for a digital Geneva Convention to protect the internet."