Nonetheless China's hackers continue to be a source of friction between Washington and Beijing.
Alleged cyberattacks from China have angered the U.S. which has blocked business deals for Chinese companies. Washington is now considering sanctions on those suspected of engaging in commercial cybertheft. U.S. officials are expected to bring up their complaints to their Chinese counterparts during President Xi's trip.
Prince denies his group has targeted U.S. companies though he says it has attacked commercial organizations in regional rival Japan.
"In terms of Japan, our primary target is the government website then commercial organizations. Japan invaded China before therefore we have kept files on many targets," he said while sitting at his desk in front of two computer screens.
"Normally, we first narrow down our targets and then run software to analyze the loopholes in the website or system. We detect the most vulnerable process or the most destructive part and then launch the attack."
He demonstrated how quickly he can hack into a local hospital. He finds an email. Based on the security question, he guesses passwords like the hospital address. By the third try, he is in the system in less than five minutes. "We are now able to gather more information -- email, phone numbers, fax…" he explained.
Prince said the most common attack is a distributed denial-of-service or DDoS attack to cripple a website.
"We never proactively launch attacks for no reason. We only do it when China's national interest is harmed," he said.
"In most of the cases, we just fight back."
For attacks, he says the hackers act on their own but that occasionally they're called on by the government to help track those believed to be working against the state.
"I independently have some cooperation with the Chinese government but it's all off the record," he said.
"The government normally asks me to follow the electronic footprint of different hackers, gather information on hackers, and ultimately submit official reports."