The personal information of around 100,000 people was leaked following a hacking attack on the Cheong Wa Dae website last Tuesday. The presidential office on Sunday said the leaked information involves around half of the 200,000 people who signed up to access the Cheong Wa Dae website and includes their names, birthdates, IDs and IP addresses.
But their resident registration numbers and passwords have been stored in encoded formats and were apparently uncompromised.
Right after the hacking attack, the Cheong Wa Dae website showed messages in red, including one that read "Great leader Kim Jong-un," referring to the North Korean leader. Another website revealed the personal details of 100,000 members of the conservative Saenuri Party.
A message that read, "We Are Anonymous. We Are Legion. We Do Not Forgive. We Do Not Forget. Expect Us," was also posted on the Cheong Wa Dae website along with a photo of President Park Geun-hye. But hacker collective Anonymous denied it was behind the attack.
The "hacktivists" threatened in April to attack 46 North Korean websites including the official KCNA news agency on June 25, to mark the 60th anniversary of the outbreak of the Korean War.
Cheong Wa Dae has informed each subscriber of the leak as well as posting an apology. A Cheong Wa Dae official said the presidential office will get subscribers to change their passwords in order to minimize future damage.