Experts said North Korea could use cyber attacks as a tool to paralyse the South's telecoms system before military strikes. Tensions have climbed recently, with North Korean missile launches, a nuclear test, abrogation of a sea boundary agreement and repeated threats of war.

“It is very likely that groups hostile to our government engage in cyber warfare,” said Kim Kwang-jo, president of the Korea Institute of Information Security and Cryptology. “The latest cyber attack seems to be aimed at displaying the North's technological prowess.”

North Korea is believed to have expanded its cyber warfare unit to about 100 agents to gather intelligence on South Korea's military and to disturb the South's computer networks. Southern military officials said last month they were detecting 95,000 attempted cyber attacks a day on average and about 11 per cent of them were attempts to obtain military information.

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