US president-elect Donald Trump says "no computer is safe" when it comes to keeping information private, expressing scepticism about the security of online communications.
Mr Trump rarely uses email or computers despite his frequent tweeting.
"You know, if you have something really important, write it out and have it delivered by courier, the old-fashioned way. Because I'll tell you what: No computer is safe," Mr Trump told reporters during his annual New Year's Eve bash.
Mr Trump has repeatedly cast aside allegations by US intelligence agencies that Russia tried to influence the presidential election through hacking.
He says he plans to meet with intelligence officials next to week to learn more about the allegations, "to be sure (about it), because it's a pretty serious charge."
"I know a lot about hacking. And hacking is a very hard thing to prove, so it could be somebody else," he said.
He added, cryptically, that he also knows "things that other people don't know. And so they cannot be sure of the situation."
Mr Trump made the comments during his annual New Year's Eve bash at his Mar-a-Lago club.
Hundreds of guests gathered in the club's grand ballroom, including action star Sylvester Stallone and romance novel model Fabio.
Earlier in the day, Mr Trump ditched his press pool, travelling to play golf at one of his clubs.
A member of Mr Trump's golf club in Jupiter, Florida, posted a photo on Twitter of Mr Trump on the greens on Saturday morning and said about 25 Secret Service agents accompanied the President-elect.
Before he went golfing, Mr Trump tweeted an unusual New Year's message to friends and foes.
"Happy New Year to all, including to my many enemies and those who have fought me and lost so badly they just don't know what to do. Love!"
With the arrival of 2017, another New Year's message moved on Mr Trump's Twitter account at about midnight.
This one was decidedly more upbeat and carefully prepared - illustrated with a photo that included his holiday message.
"To all Americans- HappyNewYear & many blessings to you all! Looking forward to a wonderful & prosperous 2017 as we work together to #MAGA [sic]."
MAGA stands for Make America Great Again, his campaign slogan during the election.