More than 20 students recently sat in a room on the 12th floor of a New York office building to learn how to hack into Linux systems. But it wasn't an underground session run by computer criminals; instead, these students . . .
More than 20 students recently sat in a room on the 12th floor of a New York office building to learn how to hack into Linux systems. But it wasn't an underground session run by computer criminals; instead, these students hoped to learn how to protect their computer systems and E-commerce Web sites from attack.

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