U.S. Already at War in Cyberspace

The following article isn't very deep, but it underscores an emerging threat. Cyber-warfare shares several key traits with terrorism in that it is asymmetrical and can easily be conducted by non state actors. The ease of an organization to attack a nation through these means, coupled with the relatively low risk from doing so virtually guarantees a huge upswing in this type of conflict.

U.S. already at war in cyberspace, experts say -- Government Computer News