China says U.S. hacking accusations lack technical proof

BEIJING (Reuters) - Accusations by a U.S. computer security company that a secretive Chinese military unit is likely behind a series of hacking attacks are scientifically flawed and hence unreliable, China's Defense Ministry said on Wednesday.

The statement came after the White House said overnight that the Obama administration has repeatedly taken up its concerns about cyber-theft at the highest levels of the Chinese government, including with Chinese military officials.

The security company, Mandiant, identified the People's Liberation Army's Shanghai-based Unit 61398 as the most likely driving force behind the hacking. Mandiant said it believed the unit had carried out "sustained" attacks on a wide range of industries.

The Chinese Defence Ministry, which has already denied the charges, went further in a new statement, slamming Mandiant for relying on spurious data.

"The report, in only relying on linking IP address to reach a conclusion the hacking attacks originated from China, lacks technical proof," the ministry said in a statement on its website (www.mod.gov.cn).

"Everyone knows that the use of usurped IP addresses to carry out hacking attacks happens on an almost daily basis," it added.

"Second, there is still no internationally clear, unified definition of what consists of a 'hacking attack'. There is no legal evidence behind the report subjectively inducing that the everyday gathering of online (information) is online spying."

As hacking is a cross-border, anonymous and deceptive phenomenon, by its very nature it is hard to work out exactly where hacks originated, the statement said.

Chinese Foreign Ministry spokesman Hong Lei, asked about the U.S. taking up its concerns about hacking with Beijing, said: "China and the U.S. have maintained communication over the relevant issue".