NSA tried Stuxnet cyber-attack on North Korea five years ago but failed

Intelligience sources say a covert campaign to attack nuclear weapons programme was stymied by North Korea’s isolated communications systemsThe US tried to deploy a version of the Stuxnet computer virus to attack North Korea’s nuclear weapons programme five years ago but ultimately failed, according to people familiar with the covert campaign.The operation began in tandem with the now-famous Stuxnet attack that sabotaged Iran’s nuclear programme in 2009 and 2010 by destroying a thousand or