No computer is safe, Trump warns, as he casts doubt on Russian hacking attempts

US president-elect Donald Trump has said "no computer is safe" when it comes to keeping information private, expressing new scepticism about the security of online communications.

Mr Trump, who rarely uses email or computers despite his frequent tweeting, told reporters during his annual New Year's Eve party at his Mar-a-Lago club in Florida: "You know, if you have something really important, write it out and have it delivered by courier, the old-fashioned way.