| 摘要 |
A portable data sensor tag (2), includes a memory (24), a data communication circuit (20) which receives a wireless activation signal from an external terminal, and, in an operation using electromotive force generated by the received activation signal, receives an encryption key from the external terminal and stores the received encryption key into the memory (24), a power source (23) which supplies power, an insulator (27) which switches a power supply from the power source (23) from off to on; and a sensor circuit (22) which reads the encryption key from the memory (24), encrypts measured data using the read encryption key, and stores the encrypted measurement data into the memory (24), the sensor circuit operating using the power supplied from the power source (23) after the power supply from the power source (23) is switched on.
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