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SEOUL, South Korea — North Korean hackers stole a vast cache of data, including classified wartime contingency plans jointly drawn by Washington and Seoul, when they breached the computer network of the South Korean military last year, a South Korean lawmaker said Tuesday.

Included was the South Korean military’s plan to remove North Korean leader Kim Jong Un, referred to as a “decapitation” plan, should war break out on the Korean Peninsula, the lawmaker, Rhee Cheol-hee, told reporters.

Rhee, a member of the governing Democratic Party who serves on the defense committee of the National Assembly, said he only recently learned of the scale of the North Korean hacking attack, which was first discovered in September 2016.

It was not known whether any of the military’s top secrets were leaked, although Rhee said nearly 300 lower-classification confidential documents were stolen. The military is still unable to catalog nearly 80 percent of the 235 gigabytes of leaked data, he said.

North Korea and South Korea have long had each other’s computer networks in their sights. The United States, piggybacking on South Korean operations, broke into the North’s computer systems in 2010, targeting the Reconnaissance General Bureau, the North’s equivalent of the CIA.

South Korean intelligence officials told lawmakers in June that Kim was desperate to get hold of South Korea’s decapitation plan. He had also begun using his deputies’ cars as decoys to move from place to place, they said.

When the hack was discovered last year, the ministry blamed North Korea. But it has acknowledged only that “some classified information” was stolen, saying that revealing more details would only benefit its enemies.

Some South Korean news media, citing anonymous sources, earlier reported that the leaked data included wartime contingency plans. But Rhee is the first member of the parliamentary committee that oversees the military to disclose similar details.

It remained unclear how much the hacking has undermined the joint preparedness of the South Korean and U.S. militaries, with South Korean officials simply saying they’ve been redressing whatever damage was caused by the cyberattack.

The military plans for dealing with North Korea have been rewritten in recent months by U.S. Secretary of Defense Jim Mattis.