Obama Lets NSA. Exploit Some Internet Flaws, Officials Say

Stepping into a heated debate within the nation’s intelligence agencies, President Obama has decided that when the National Security Agency discovers major flaws in Internet security, it should — in most circumstances — reveal them to assure that they will be fixed, rather than keep mum so that the flaws can be used in espionage or cyberattacks, senior administration officials said Saturday.

But Mr. Obama carved a broad exception for “a clear national security or law enforcement need,” the officials said, a loophole that is likely to allow the N.S.A. to continue to exploit security flaws both to crack encryption on the Internet and to design cyberweapons.

The White House has never publicly detailed Mr. Obama’s decision, which he made in January as he began a three-month review of recommendations by a presidential advisory committee on what to do in response to recent disclosures about the National Security Agency.