The director of the Federal Bureau of Investigation has offered fresh details of the cyber attack on Sony Pictures as he defended the US claim that North Korea was responsible. Some internet security consultants have cast doubt on Pyongyang's involvement in the data breach, but James Comey, the FBI director, said he had "high confidence" in the bureau's conclusion and cited recently declassified material. Guardians of Peace, the group claiming credit for the attack, used proxy services to disguise their location when sending emails threatening Sony employees and posting statements online explaining their work, he ... (full story)