The U.S. Department of Energy (DoE) is the latest federal agency to become the victim of a cyberattack while not immediately being aware of it. Security experts say the intrusion was unlikely a prelude to what outgoing Secretary of Defense Leon Panetta has warned is a coming “cyber Pearl Harbor” But, they said it is serious all the same, because it shows how vulnerable critical government departments are to espionage. A hacker group called Parastoo, which is Farsi for the swallow bird, claimed responsibility for the attack on January 21.”]