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Means for recovering tamper evidence in RFID tags regardless of the power supply to the chip or reconnection of the tamper loop.
Means for recovering tamper evidence in RFID tags regardless of the power supply to the chip or reconnection of the tamper loop.
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机译:用于回收RFID标签中篡改证据的方法,而与向芯片供电或篡改回路的重新连接无关。
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摘要
An RFID tag which indicates that a tamper event has occurred includes a memory cell 1 connected to a conductive loop 6 by pins 12. The memory cell has a memory status set to '1' and contains a charge 2 which dissipates via the conductive loop 6 as a result of a tamper event. When the charge dissipates the memory status changes to '0'. Upon being interrogated by a reader, the tag sends memory status information to the reader thus indicating whether the tag has been tampered with. Preferably the conductive loop 6 includes a switch 5 which is closed when the tag is tampered with, causing dissipation of the memory cell charge. Alternatively, the conductive loop may be a closed circuit (not shown) which is opened as a result of tampering. A diode 4 prevents the memory cell from being reset by reconnecting or repairing the tamper circuit. A diode 9 prevents the cell from discharging when the voltage from the power supply 3 falls below a useful level. The tag may be used to indicate when the contents of a bottle have been tampered with.
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