]> 2006-09-01T00:00:00-05:00 Our approach uses inexpensive passive RFID tags, an RFID reader, an authenticating agent, and a local entity that can dynamically reprogram tags to protect their identity. We ensure the visibility of goods to authorized RFID readers at any point in the transit of RFID-tagged goods from one location to another while denying information to unauthorized readers. The approach protects the identity of the RFID tags without significant changes to the existing infrastructure and obviates the need for expensive, active RFID tags. We present our scheme in the context of a transit vehicle like a truck that carries RFID-tagged goods from one place to another.]]> 3517 55478