Four days before he leaves office, US president Joe Biden has issued a sweeping cybersecurity directive ordering improvements to the way the government monitors its networks, buys software, uses artificial intelligence, and punishes foreign hackers.The 40-page executive order unveiled on Thursday is the Biden White House’s final attempt to kickstart efforts to harness the security benefits of AI, roll out digital identities for US citizens, and close gaps that have helped China, Russia, and othe...