On-vehicle device, ground data management device, ground-to-vehicle communication security system, and ground-to-vehicle communication method

摘要

An on-board device mounted on a train for the purpose of obtaining an on-board device that can ensure high security even in a public wireless line, and an on-board wireless communication unit that performs wireless communication with the ground side A second vehicle upper side wireless communication unit 102 and a vehicle upper side vehicle-to-vehicle communication security unit 106 that encrypts or decrypts data for wireless communication are provided. Car upper side secret key holding unit 162 that holds a plurality of secret keys with secret key numbers to be encrypted or decrypted, and a secret key number calculated from train information unique to the train. The vehicle upper side secret key selection unit 161 that selects one secret key from the unit 162, and the vehicle upper side that performs encryption or decryption of wireless communication data using the one secret key selected by the vehicle upper side secret key selection unit 161 And a No. decoding unit 163.