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It seems that they were hired by the Department of Homeland Security to provide network defense and intruder detection. Unisys certified DHS's network as secure, now it turns out that DHS was hacked for three months last year.
http://syndicated.livejournal.com/bruce_schneier/454526.html?mode=reply
http://syndicated.livejournal.com/bruce_schneier/454526.html?mode=reply