Information processing system, method of obtaining monitor information, and sensor device

A method of obtaining monitor information from a monitor target using an information processing system including an information processing device, an electronic tag storing first identification information used for identifying the monitor target, and a sensor device, the method comprising:

• acquiring, by the sensor device, first monitor information of the monitor target;
• transmitting, by the information processing device, to the sensor device and a server device, a first encryption key corresponding to the first identification information;
• transmitting, by the information processing device, to the sensor device and a server device, second identification information used for identifying the first encryption key;
• acquiring, by the sensor device, the first identification information from the electronic tag;
• encrypting, by the sensor device, the first monitor information using the first encryption key that corresponds to the first identification information;
• and
• transmitting, by the sensor device, to the server device, the encrypted first monitor information and the second identification information.

A sensor device comprising:

• a memory;
• and
• a processor coupled to the memory and configured to;
• acquire first monitor information of a monitor target,
• obtain, from an information processing device, a first encryption key corresponding to the first identification information,
• obtain, from the information processing device, second identification information used for identifying the first encryption key,
• acquire first identification information used for identifying the monitor target from an electronic tag,
• encrypt the first monitor information using the first encryption key that corresponds to the first identification information, and
• transmit, to a server device, the encrypted first monitor information and the second identification information.