North Korea may have been behind the ransomware cyber-attack on the NHS and up to 100 countries as well as the UK, a former head of the US Department of Homeland Security has claimed. Michael Chertoff, who served under George W Bush from 2005 to 2009, said that agents or allies of the Pyongyang regime are the most likely suspects for the hacking of the health service’s administration system in the UK and state infrastructures across the globe this month.

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