China demanded the US to prove allegations of cyber attack.

Beijing yesterday denied the accusations from Washington that Chinese hackers were behind the theft of data of more than 4 million US officers.

Data from more than 4 million US officers have been stolen since 1985. Artwork: Reuters.

"Network attacks are often anonymous and implementation across the border. Their origins are difficult to track," Sputnik quoted Hong Lei, spokesman for China's Foreign Ministry, told a regular press conference. "No investigation techniques and always use words like 'may' is irresponsible and unscientific".

Washington on 4/6 admits hackers access to the personal data of at least 4 million people has been a federal employee. Several unnamed US officials said the attackers "in China" but unknown factor or criminal authorities in the incident or not.

"The data has been stolen since 1985," Reuters quoted a US official said. "That means we can have information on those who have retired and they know what to do after leaving government."

This person said that the access to computer data from the Office of Public Affairs office (OPM) as date of birth, social security number and banking information, enabling hackers to try the password capable at other sites, including the storage of information on weapons systems.

"We'll have a big advantage," said the official.

According to information in a memorandum of the US House, said OPM data access by hackers but it is unclear what they stole. The US State Department said the data on the agency staff are safe because they are not stored on the system OPM attacked. Only those who worked in other federal agencies might reveal new information, the US State Department notified.

Investigators are linking the incident with the two cases OPM stolen personal data previously at Anthem Inc., the health insurance the second largest in the US, and Premera Blue Cross, a provider of health services . The incident is considered a matter of national security, which means that it may come from a foreign government.

This is the second computer penetration in less than 12 months at OPM. It appears the question of how the US response if the Chinese government confirmed the attack behind this network.

"It is not clear culprit," Josh Earnest, White House spokesman, said, while noting that President Barack Obama and aides regularly raise the issue of Beijing's behavior in cyberspace with counterpart China.

Incident at OPM was announced shortly before the annual event and Economic Dialogue and the US Strategy - China, expected to be held in Washington DC from 22 to 24/6. Network security will be discussed more in the agenda.

Source.