Bruce Schneier is well known as a writer, security maven and cryptographer. At this year's LinuxCon [slideshow] he confirmed he believes we now are in the midst of a legitimate cyber-arms race.
Scheier said, believe it or not, that "the first destructive attack by a nation against the US was against a movie company." The trigger may have been merely Sony's 'The Interview' movie, but the goal appears to have been to cause "destruction and coercion" to a major Western country. Sony was also targeted Schneier suspects because, compared to other companies, its security was so weak.ZDNET