CANBERRA -- In Units 110 and 121 of North Korea's General Staff Reconnaissance Bureau, several thousand information technology experts are working on ways to disrupt the vital installations and systems of their enemy countries via the internet.
About 600 of the 1,800 staff in Unit 121 are dedicated to finding weaknesses in South Korea's computer systems to exploit in the event of war, according to defectors, according to Western cybersecurity experts.
