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Some 614 gigabytes of material were taken in the breaches that occurred in January and February. Among these were secret plans to develop a supersonic anti-ship missile for use on US submarines by 2020, The Washington Post reported.
Quoting unnamed American officials, the daily said the stolen material also included information related to a secretive project known as Sea Dragon, as well as signals and sensor data, submarine radio room information relating to cryptographic systems, and the Navy submarine development unit’s electronic warfare library.
The data was stolen by Chinese hackers by breaching into the computers of a contractor. The name of the contractor was not released by the daily.
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After the publication of the story, the Pentagon inspector general’s office said that Defence Secretary Jim Mattis had asked it to review contractor cybersecurity issues, the daily said.
The Navy is leading the investigation into the breach with the help of the FBI, officials said.
Chinese hackers have for years targeted the US military to steal information and the Pentagon says they have previously swiped crucial data on the new F-35 stealth fighter, the advanced Patriot PAC-3 missile system and other highly sensitive projects.
The Pentagon last month pulled its invitation for China to join maritime exercises in the Pacific because of Beijing’s “continued militarisation” of the South China Sea.