Patent ID: 11930021
Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 15:
16. The unauthorized frame detection method according to claim 13, wherein
a) the unauthorized frame detector receives an update request for updating a permission table storing the permission rule from one of the electronic control units,
b) the unauthorized frame detector generates a random number seed in response to receiving update request and transmits the generated random number seed to the one of the electronic control units to check whether the received update request is a legitimate request,
c) the one of the electronic control units calculates a response to receipt of the random number seed through a predetermined arithmetic operation using the received random number seed and a key held in key holder, and transmits the calculated response to the unauthorized frame detector, and
d) the unauthorized frame detector verifies the calculated response when the calculated response is positive, determines that the update request is legitimate, and updates the permission table in accordance with the update request.