What do you do when your hobby - security - becomes your job? You chase other people whose hobby is hacking.

That's the role Scott Charney has taken since he started working on security for the U.S. Justice Department in the early 1990s and, most recently, as Microsoft's chief security strategist.

In January, Microsoft pegged Charney to replace Howard Schmidt, who left the company to become vice chairman of the President's Critical Infrastructure Protection Board, a federal commission.

He arrives at Microsoft at a time when virtually everyone is thinking security, spurred by last year's terrorist attacks on the Pentagon and the World Trade Center. Charney testified about cyberterrorism last month on Capitol Hill.

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