Even the ATM machines were suspect at this year's Defcon conference, where hackers play intrusion games at the bleeding edge of computer security. With some of the world's best digital break-in artists pecking away at their laptops, sending e-mails or answering cell phones could also be risky. Defcon is a no-man's land where customary adversaries — feds vs. digital mavericks — are supposed to share ideas about making the Internet a safer place. But it's really a showcase for flexing hacker muscle.

This year's hot topics included a demonstration of just how easy it may be to attack supposedly foolproof biometric safeguards, which determine a person's identity by scanning such things as thumb prints, irises and voice patterns.

Banks, supermarkets and even some airports have begun to rely on such systems, but a security analyst who goes by the name Zamboni challenged hackers to bypass biometrics by attacking their backend systems networks. "Attack it like you would Microsoft or Linux," he advised.

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