KEY MANAGEMENT METHOD USED IN ENCRYPTION PROCESSING FOR SAFELY TRANSMITTING AND RECEIVING MESSAGES

摘要

Provided is a key management method to secure security in an onboard network system having multiple electronic control units storing a shared key. In the key management method of the onboard network system including multiple electronic units (ECUs) that perform communication by frames via a bus, a master ECU stores a shared key to be mutually shared with one or more ECUs. Each of the ECUs acquire a session key by communication with the master ECU based on the stored shared key, and after this acquisition, executes encryption processing regarding a frame transmitted or received via the bus, using this session key. In a case where a vehicle in which the onboard network system is installed is in a particular state, the master ECU executes inspection of a security state of the shared key stored by the ECU or the like.

主权项

1. A key management method in an onboard network system having a plurality of electronic control units (ECUs) that perform communication by frames via a bus, the method comprising:
storing, in a first-type electronic control unit out of the plurality of electronic control units, a shared key to be mutually shared with one or more second-type electronic control units other than the first-type electronic control unit, the shared key also being stored in the one or more second-type electronic control units other than the first-type electronic control unit; acquiring, by each of the second-type electronic control units, a session key by communication with the first-type electronic control unit based on the stored shared key, and after this acquisition, executing encryption processing regarding a frame transmitted or received via the bus, using this session key; and executing, by the first-type electronic control unit, inspection of a security state of the shared key stored by the second-type electronic control units in a case where a vehicle in which the onboard network system is installed is in a particular state.