A profile of Aleksanteri Kivimäki, a prolific hacker wunderkind with a mean streak, who stood trial over a ransomware attack on Finnish health provider Vastaamo (Drake Bennett/Bloomberg)

Drake Bennett / Bloomberg:
A profile of Aleksanteri Kivimäki, a prolific hacker wunderkind with a mean streak, who stood trial over a ransomware attack on Finnish health provider Vastaamo  —  Aleksanteri Kivimäki was a hacker wunderkind with a mean streak.  Now he's on trial for the largest crime in Finland's history.