Ransomware attacks against shipping companies have spiked in number and severity over the past year, according to security firms. Norwegian shipbuilder Vard, part of Italy’s Fincantieri, was hit last week but has declined to give details. Lars Jensen, a maritime security adviser at Danish cybersecurity firm Improsec, said there had been more cyber attacks on shipping in recent years, but an increase was hard to gauge as many attacks went unreported