Korean Cyber-Warfare

The Korean War may have ended in an armistice, but it seems to be continuing in cyberspace.  The latest evidence of this is in press reports that the South Korean-U.S. joint war plans, referred to as Operation Plan 5027, may have been hacked.  According to The Korea Times, the Defense Ministry announced that computer hackers who may be from North Korea might have gained access to this secret plan.
The Chosun Ilbo reported that an officer with the U.S.-Korea Joint Forces Command had used an unsecured USB memory stick and that, in the process, some contents of the secret plan were accessed by a hacker with a Chinese IP address.  North Korea is believed to have military personnel who specialize in hacking.