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US 9,004,367 B2Granted
Radio frequency identification (RFID) tag and method of updating key of RFID tag
AssigneeElectronics and Telecommunications Research Institute
InventorsSang Yeoun Lee, Joo Sang Park, Heyung Sub Lee, Chan Won Park
Life of this patent
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Abstract
In relation to a security function of a radio frequency identification (RFID) tag, an RFID tag and a method of updating a key of the RFID tag that may manage a key to be used for an access to a reader by storing the key in a memory having a duplex structure, thereby minimizing an update error occurring during a process of updating the key are provided.
Claims10
A radio frequency identification (RFID) tag comprising:
- a first memory to record a first key to be used for an access to an RFID reader;
- a second memory, distinct from the first memory, to record a second key transmitted from the accessed RFID reader;
- an inspector to generate a check value inspected in relation to the second key, in response to an input of a check value from the RFID reader;
- and
- a processor to determine the second key to be a key to be used for the access to the RFID reader, when the generated check value corresponds to the input check value;
- wherein the processor maintains use of the first key as the key to be used for the access to the RFID reader and invalidates the second key in the second memory, when a reset occurs while the second key is being recorded in the second memory, or when the check value is not input from the RFID reader within a predetermined time after the second key is recorded in the second memory.
3 more elements
A method of updating a key of a radio frequency identification (RFID) tag, the method comprising:
- recording a first key to be used for an access to an RFID reader in a first memory;
- recording a second key transmitted from the accessed RFID reader in a second memory distinct from the first memory;
- generating a check value inspected in relation to the second key, in response to an input of a check value from the RFID reader;
- and
- determining the second key to be a key to be used for the access to the RFID reader, when the generated check value corresponds to the input check value;
- maintaining use of the first key as the key to be used for the access to the RFID reader and invalidating the second key in the second memory, when a reset occurs while the second key is being recorded in the second memory, or when the check value is not input from the RFID reader within a predetermined time after the second key is recorded in the second memory.
3 more elements
Dependencies are inferred from the claim text.