Mr. Kiriakou first stumbled into the public limelight by speaking out about waterboarding on television in 2007, quickly becoming a source for national security journalists, including this reporter, who turned up in Mr. Kiriakou’s indictment last year as Journalist B. When he gave the covert officer’s name to the freelancer, he said, he was simply trying to help a writer find a potential source and had no intention or expectation that the name would ever become public. In fact, it did not surface publicly until long after Mr. Kiriakou was charged.