12 "White Hat" hackers you should know

These IT security experts go looking for trouble and find it

The "White Hat" angle: With expertise in tracking malware and botnets used by cyber-criminals for financial gain, Stewart is often the first to identify dangerous new code specimens and how they work, such as the elusive Clampi Trojan and how the SoBig worm was sending spam. It all gives him an unpleasantly close look at East European and Chinese cyber-gang activity.

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