SYSTEM AND METHOD FOR SECURING RFID TAGS
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United States of America Patent
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app pub date -
Jun 21, 2007
filing date -
Apr 21, 2005
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Abandoned
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Abstract
A method for generating and using a consumable RFID tag in a system including a plurality of RFID tag readers communicatively coupled in a network in which the tag includes rewritable tag memory. Data is stored in the tag memory, including a sequence number, a UID, and an ownership ID. The data is signed with a key to generate signed content. Each time the tag is read by one of the readers in the network, the signature and sequence number in the tag memory are validated by comparing signed content stored in the tag with signature data stored in said one of the readers; a new sequence number is stored in the tag memory; contents of the tag memory, including the new sequence number and the ownership ID, are signed with a key to generate new signed content; and the new signed content is written to the tag memory.
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