U.S. President-elect Donald Trump talks to reporters as he and his wife Melania Trump arrive for a New Year's Eve celebration with members and guests at the Mar-a-lago Club in Palm Beach, Florida, U.S. December 31, 2016. Reuters/Jonathan Ernst

President-elect Donald Trump claimed on Saturday to know "a lot about hacking" and said the best way to send important communications is to "have it delivered by courier, the old-fashioned way."

"I don't care what they say, no computer is safe," said Trump, who does not use a computer.

"I have a boy who's 10 years old, he can do anything with a computer," the president-elect added, according to the pool report. "You want something to really go without detection, write it out and have it sent by courier."

Trump also responded to a question about alleged hacking during the election and his reluctance to attribute the attacks to Russia, saying it would be "unfair" to lay blame without first being certain.

The Obama administration on Thursday took action against Russia for the alleged hacking, issuing sanctions and expelling 35 diplomats.

"I also know things that other people don't know, and so they cannot be sure of the situation," Trump said.

Asked what he knew that others do not, Trump replied: "You'll find out Tuesday or Wednesday."