A 29-year-old former undercover CIA employee said Sunday that he was the principal source of recent disclosures about top-secret National Security Agency programs, exposing himself to possible prosecution in an acknowledgment that had little if any precedent in the long history of U.S. intelligence leaks.
Edward Snowden, a tech specialist who has also contracted for the NSA and works for the consulting firm Booz Allen Hamilton, unmasked himself as a source after a string of stories in The Washington Post and The Guardian that detailed previously unknown U.S. surveillance programs. He said he disclosed secret documents in response to what he described as the systematic surveillance of innocent citizens.
In an interview Sunday, Mr. Snowden said he is willing to face the consequences of exposure.
"I'm not going to hide," Mr. Snowden told The Post from Hong Kong, where he has been staying at a hotel. "Allowing the U.S. government to intimidate its people with threats of retaliation for revealing wrongdoing is contrary to the public interest."
Asked whether he believes that his disclosures will change anything, he said: "I think they already have. Everyone everywhere now understands how bad things have gotten -- and they're talking about it. They have the power to decide for themselves whether they are willing to sacrifice their privacy to the surveillance state."
Mr. Snowden said nobody had been aware of his actions, including those closest to him. He said there was no single event that spurred his decision to leak the information, but he said President Barack Obama has failed to live up to his pledges of transparency.
"My sole motive is to inform the public as to that which is done in their name and that which is done against them," he said in a note that accompanied the first document he leaked to The Post.
The Guardian, a British newspaper, was the first to publicly identify Mr. Snowden, at his request.
The Guardian said Mr. Snowden was working at an NSA facility in Hawaii three weeks ago when he decided to release the documents. It said he copied the documents and then told a supervisor that he needed to go away for several weeks for medical treatment. He left for Hong Kong on May 20.
The Guardian initially reported the existence of a program that collects data on all phone calls made on the Verizon network. Later in the week, The Guardian and The Post reported the existence of a separate program, code-named PRISM, that collects the Internet data of foreigners from major Internet companies.
The White House said late Sunday that it would not have any comment on the matter.
In a brief statement, a spokesman for the Office of the Director of National Intelligence said the intelligence community is "reviewing the damage" the leaks have done. "Any person who has a security clearance knows that he or she has an obligation to protect classified information and abide by the law," said the spokesman, Shawn Turner.
Mr. Snowden said he is seeking "asylum from any countries that believe in free speech and oppose the victimization of global privacy," but the law appears to provide for his extradition from Hong Kong, a semiautonomous territory of China, to the United States.
Although any extradition proceeding could take months or even years, experts said Mr. Snowden has not put himself in a favorable position.
"The fact that he outed himself and basically said, from what I understand he has said, 'I feel very comfortable with what I have done' ... that's not going to help him in his extradition contest," said Douglas McNabb, a lawyer and extradition expert.
The Justice Department said it is in the "initial stages of an investigation" into the unauthorized disclosure of classified information but declined to comment further.
Current and former U.S. intelligence officials said the revelation of Mr. Snowden's role in the leaks will lead to a sweeping re-examination of security measures at the CIA and the NSA, and they described his decision to come forward as a stunning conclusion to a week of disclosures that rattled the intelligence community.
"This is significant on a number of fronts: the scope, the range. It's major, it's major," said John Rizzo, a former general counsel of the CIA who worked at the agency for decades. "And then to have him out himself ... I can't think of any previous leak case involving a CIA officer where the officer raised his hand and said, 'I'm the guy.' "
A half-dozen former intelligence officials, including one who now works at Booz Allen Hamilton, said they did not know Mr. Snowden or anything about his background. Several former officials said he easily could have been part of a surge in computer experts and technical hires brought in by the CIA in the years after the Sept. 11, 2001, attacks as its budget and mission swelled.
Officials said the CIA and other spy agencies did not relax their screening measures as the workforce expanded. Still, several officials said the CIA will now undoubtedly begin reviewing the process by which Mr. Snowden was hired, seeking to determine whether there were any missed signs that he might one day betray national secrets.
More broadly, the CIA and the NSA may be forced to re-examine their relationships with contractors, who were employed in roles ranging from technical support to paramilitary operations before concerns about the outsourcing of such sensitive assignments prompted a backlash in Congress and pledges from the agencies to begin thinning their contracting ranks.
Some former CIA officials said they were troubled by aspects of Mr. Snowden's background, at least as he described it to The Post and the Guardian.
For instance, Mr. Snowden said he did not have a high school diploma. One former CIA official said that it was extremely unusual for the agency to have hired someone with such thin academic credentials, particularly for a technical job, and that the terms Mr. Snowden used to describe his agency positions did not match internal job descriptions.
McClatchy Newspapers contributed. First Published June 9, 2013 7:15 PM