There have been reports from both Korean and American intelligence officials that North Korea is responsible for the distributed denial of service (DDos) attacks. Researchers from SecureWorks and Symantec both told Wired’s security blog that there is no evidence from the attack code linking it to North Korea.

F-Secure tells PC Authority a similar story on the initial reports of a cyberwar:

F-secure's Mikko Hypponen, who serves as the chief research officer and senior malware analyst for the Finnish Antivirus software company, believes that the North Korean government's sabre rattling does not extend to the Internet, no matter how much news sites such as Reddit (through Mx logic) would have you believe.

The Korea Communications Commission (KCC) created a new DDOS Countermeasure Council in April with over forty industry participants to deal with DDoS attacks:

As part of the council, it is highly meaningful that businesses can improve their own ability to respond to DDoS attacks by sharing information and that it has created a venue through which to convey their opinion to the government.

Recent DDoS attacks are often either of the threatening type with money as the objective against various companies such as portals, financial institutions, hosting businesses, game businesses and shopping malls or of the revenge type to express dissatisfaction.

The KCC is also working with Internet service providers to possibly disconnect Internet connections of infected computers:

The commission also said that it will continue to monitor the situation and that it may request the internet service providers to cut off the infected computers' internet access if such measures are deemed necessary.

The measures were announced after the KCC held a meeting with executives of 14 major internet service providers including KT Corp., SK Broadband and LG Dacom.

The Korean government has also been recently addressing the securing of computer networks with possible threats from North Korean-based hackers. The Ministry of National Defense is also setting up a Cyber-Defense command that was supposed to be in operation by 2012:

The command will include key intelligence officials and computer experts from the defense ministry, the Defense Security Command and the three branches of the military, said the spokesman.

South Korea's military computer networks are facing an ever-growing number of cyber attacks, with 95,000 cases reported per day on average, the Defense Security Command said at a forum in Seoul earlier this month.

But due to the recent attacks, the time table has been moved up by two years and will be ready by January 1, 2010.