RFID tags with dynamic key replacement
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United States of America Patent
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Feb 6, 2018
Issued Date -
N/A
app pub date -
Dec 21, 2016
filing date -
Jul 2, 2013
priority date (Note) -
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Abstract
A cryptographically-enabled RFID tag stores a primary secret key and derives secondary keys from the primary key. A secondary key may be derived by combining the primary key with one or more other parameters using one or more algorithms. The tag uses a derived secondary key to encrypt or electronically sign a tag response sent to a verifying entity. The verifying entity does not know the derived secondary key, but knows the tag primary key and the parameters and algorithms used to derive the secondary key and can derive all of the potential secondary keys. The verifying entity can then attempt to authenticate the tag or tag response by trying potential secondary keys.
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