Paris (AFP) – Hundreds of Swedish supermarkets remained shut Tuesday after a major cyberattack that has crippled hundreds of companies worldwide for the past four days, with the perpetrators demanding $70 million in bitcoin to undo the damage.  Kaseya, the Miami-based IT company at the centre of the hack, said late Monday that up to 1,500 businesses had been affected by Friday’s attack, which has been blamed on Russian-speaking hackers.  Experts believe this could be the biggest “ransomware” attack on record — an increasingly lucrative form of digital hostage-taking in which hackers encrypt v…

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