According to South Korean officials, North Korea has boosted the size of its “cyber army” to more than 6,000 troops and aims to cause “physical and psychological paralysis” in South Korea and elsewhere. The Sony hack was a big deal (and, in retrospect, it may be viewed as the biggest story of 2014), but according to security experts and government folks I know, it was nothing compared to the real concern: An attack on infrastructure that could shut down power, etc, to huge regions.