'White hat' hackers in demand

Gregston Chu knows all the tricks of being a hacker, from talking his way into secure buildings to exploiting holes in Internet security or gaps in internal company systems to grab control of computers. That makes him a highly valued consultant and as such, he's crisscrossed the U.S. and traveled to Europe and Asia to uncover computer system vulnerabilities for Fortune 100 companies and other large corporations.

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