Around the same time, military contractors Boeing, Northrop Grumman, Raytheon and Lockheed Martin were also hacked from computers in China, according to industry sources. (For more, see "Cyberspies Target Silent Victims".) Alan Paller of the SANS Institute says that many of those breaches may have involved a technique known as "spear phishing"--impersonating a high level official's e-mail to lure employees into revealing their security codes.