clipped from: www.cnn.com   
They operate from a bare apartment on a Chinese island. They are intelligent 20-somethings who seem harmless. But they are hard-core hackers who claim to have gained access to the world's most sensitive sites, including the Pentagon.
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In fact, they say they are sometimes paid secretly by the Chinese government -- a claim the Beijing government denies.

"No Web site is one hundred percent safe. There are Web sites with high-level security, but there is always a weakness," says Xiao Chen, the leader of this group.

"First, you must know about the Web site you want to attack. You must know what program it is written with," says Xiao Chen. "There is a saying, 'Know about both yourself and the enemy, and you will be invincible.'"

This week, the Pentagon said computer networks in the United States, Germany, Britain and France were hit last year by what they call "multiple intrusions," many of them originating from China.

"They are sort of useful idiots for the Beijing regime."