China denied allegations of backing hackers to launch cyber attacks against other countries, stressing that it is in the common interests of the world to responsibly safeguard international cyber security.

Defense Ministry spokesman Yang Yujun

It's unprofessional and irresponsible to accuse China before verifying the anonymous hackers' identification, Defense Ministry spokesman Yang Yujun told a news conference on Thursday.

Yang's remarks were made in response to a number of recent reports playing up "China's cyber warfare".

According to a report by US Northrop Grumman for the US-China Economic and Security Review Commission, Beijing is funding research to bolster cyber attacks against US military commands and the contractors that serve them, particularly telecommunications systems.

The report issued earlier this month warned that Chinese telecommunications firms also maintained relationships with the People's Liberation Army, while these companies were giving the PLA access to cutting-edge research and technology.

"Cyber sabotage is illegal and forbidden in China, and would be severely punished," Yang said.

"China itself is also the victim of cyber attacks," he said.

In 2011, about 47,000 overseas IP addresses controlled nearly 8.9 million computers in China. From January to March this year, the websites of China's Defense Ministry and China Military Online suffered 240,000 cyber attacks, according to the Defense Ministry.

Cyber security is a common challenge faced by all countries, said Yang, urging related parties to share the responsibility of strengthening cyber security, instead of destroying mutual trust through arbitrary accusations and charges.