The United States is vulnerable to a "strategically crippling cyber attack" by enemies around the world, experts told Congress yesterday.

Testifying before the House Committee on Homeland Security, high-profile experts said the federal government's cyber defenses have become dated and may leave the country open to an attack -- "not by a conventional weapon, but by a cyber weapon."

"We are a nation unprepared to properly defend ourselves and recover from a strategic cyber attack," said Sami Saydjari, president of Professionals for Cyber Defense, a non-profit association.

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