Patent ID: 7693675

Claim:
A sensor node data protection method for setting unique data to a sensor node and protecting the unique data, the sensor node having a radio communication module for performing communications with one of a base station, a first computer system, and a second computer system, and a storage unit for holding data, the sensor node data protection method comprising the steps of: creating, by the first computer system, a first key and a second key; deactivating, by the first computer system, the unique data with the first key, and storing the deactivated unique data in the storage unit of the sensor node; storing, by the first computer system, the second key in the storage unit of the sensor node; storing, by the first computer system, the first key and the second key in a computer system set in advance; obtaining, by the second computer system, the first key and the second key from the computer system set in advance after the sensor node arrives at the second computer system from the first computer system; and executing authentication using the second key that is obtained by the second computer system and the second key that is in the storage unit of the sensor node.