China claims 80 per cent of its government websites have been attacked by hackers, with most assaults launched from the US.
Top Chinese Internet regulator Lu Wei, head of the State Internet Information Office, condemned the use of "superior technology to attack or steal secrets", but he described US-China dialogue on cyber-security as "unhindered", less than a week after the talks appeared to have stalled.
Chinese state councillor Yang Jiechi told US Secretary of State John Kerry this month that resuming cyber-security cooperation between China and the US would be difficult because of "mistaken US practices".
Speaking to reporters at a Beijing news conference today to publicise an Internet conference, Lu said the two countries had "differences but also commonalities", and he hoped they could find common ground.
Cooperation between Washington and Beijing on fighting cyber-crime ground to a halt earlier this year after the US Justice Department charged five Chinese military personnel with hacking US companies to steal trade secrets.
Chinese officials have stepped up their counter-accusations of US government hacking since former National Security Agency contractor Edward Snowden claimed the US had broken into networks and servers in China and Hong Kong.
Lu also defended China's ban on foreign Internet services such as Facebook, saying they were meant to protect the national interest.
"I've never shut down a website outside of China," Lu said. "China has always been very hospitable, but we can choose who enters our house."
Lu disputed news reports in September that quoted him as saying Facebook would "never" be allowed to enter China. "I didn't say Facebook could not enter China, but nor did I say that it could," he said.