US may block visas for Chinese hackers attending DefCon, Black Hat

Found on Ars Technica on Sunday, 25 May 2014
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The move would be “part of a broad effort to curb Chinese cyber espionage,” Reuters reported.

Wysopal noted that Black Hat talks are taped and sold after the conference, and preventing Chinese hackers from being physically there would not appreciably affect China's hacking abilities.

On Monday, Attorney General Eric Holder drew a distinction between the NSA's spying and the actions that the US government has charged five Chinese military members with, saying that China's alleged activities were "to gain commercial advantage."

Oh please, as if the NSA doesn't support the US economy by handing over secrets of companies from overseas. The NSA is heavily invovled in industrial espionage all over the world.