Note: free registration required to access this page By the time of Shiva Brent Sharma's third arrest for identity theft, at the age of 20, he had taken in well over $150,000 in cash and merchandise in his brief career. After a certain point, investigators stopped counting.

Identity theft can, of course, have its origins in a pilfered wallet or an emptied mailbox. But for computer-savvy thieves like Mr. Sharma, the Internet has forged new conduits for the crime, both as a means of stealing identity and account information and as the place to use it. The Secret Service and the Federal Bureau of Investigation have invested millions of dollars in monitoring Internet sites where thousands of users from around the world congregate to swap tips about identity theft and to buy and sell personal data. Mr. Sharma frequented such sites from their earliest days, and the techniques he learned there have become textbook-variety scams.

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