RFID technologies are getting more powerful - and vulnerable to attack

As radio frequency chips evolve to store more data and to transmit signals over greater distances, the devices can also be coaxed into giving up personal information, specialists say. RFID-enabled passport cards issued by the Department of Homeland Security and the State Department, called US Passport Card, are vulnerable to wireless attacks, and privacy advocates worry governments and marketers might use the EPC-RFID on purchased goods to secretly track shoppers - and their buying habits - by using fixed and hand-held wireless reader devices.

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