U.S. Defense Dept., Industry Join to Protect Data

By Ellen Nakashima, Washington Post Staff Writer LINTHICUM, Md. — At 2:42 p.m. one recent Wednesday, on the fourth floor of a squat brick office building under the flight path of jets landing at Baltimore-Washington International Marshall Airport, a Pentagon analyst skilled in parsing malicious computer code e-mailed a threat alert to 28 of the nation’s largest defense contractors.