12 "White Hat" hackers you should know

These IT security experts go looking for trouble and find it

The "White Hat" angle: This co-author of "Hacking Exposed: Web 2.0" and contributing editor to "Hacking VoIP" and "Mobile Application Security" digs into flaws in mobile and VoIP systems. In the past, some of his public talks and demos about compromising VoIP systems have been so detailed that chief information security officers at major corporations said they couldn't advocate investing in VoIP until the issues raised were addressed by vendors.

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