Seoul -?The Republic of Korea (ROK)?on Tuesday confirmed that the Democratic People's Republic of Korea (DPRK) was behind the June 25 cyber attack that led to shutdown of websites of the presidential office and other government agency.

The series of cyber attacks that happened from June 25 to July 1 coincided with the DPRK's past hacking patterns such as March 20 cyber attack, the Ministry of Science, ICT and Future Planning said at a press briefing.

On June 25, websites of presidential office Cheong Wa Dae and the Office of Government Policy Coordination were hacked by cyber attackers. At that time, the presidential office homepage showed a message in red letters of "Great leader Kim Jung-un." Kim Jung- un is the DPRK's leader.

Some South Korean ministries were in troubles of accessing their homepages, while other private institutions such as some local newspapers suffered a hacking on their homepages.

Based on 82 malicious codes used for the hacking and internet access records collected, the ministry found that Internet Protocol (IP) address linked to the DPRK was spotted at the June 25 and July 1 cyber attacks.