China suffered about 493,000 cyber attacks in 2010, half of which originated from abroad, according to a report issued by the National Computer Network Emergency Response Coordination Center of China on August 9.

Most of the attacks came in the form of malicious "Trojan" software used by hackers to gain access to target computers, the report said.

It said 14.7 percent of the malicious programs came from Internet Protocol addresses (IPs) located in the United States and another 8 percent came from IPs located in India.

Hackers reportedly tampered with nearly 35,000 Web pages—including 4,635 government websites—in the past year, up 67.6 percent from a year earlier. The report concluded 60 percent of the websites of ministry-level government departments are at risk of being hacked.