Patent ID: 11909726
Assignee: ROBERT BOSCH GMBH
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A control unit configured to apply control to a vehicle, the control unit configured to which unit is configured to:
receive a signal encompassing a message encrypted using a valid symmetrical key of a first control unit of a first vehicle;
ascertain a decryptability of the encrypted message using: (i) a valid symmetrical key of the control unit, or (ii) a symmetrical reserve key of the control unit ascertained using the control unit, wherein in order to ascertain the decryptability of the encrypted message, the control unit is configured to:
determine whether the encrypted message is decryptable using the valid symmetrical key, and
in case that the encrypted message is not decryptable using the valid symmetrical key, determine that the encrypted message is decryptable by the symmetrical reserve key;

decrypt the encrypted message, depending on the ascertained decryptability, using: (i) the valid symmetrical key of the control unit, or (ii) the symmetrical reserve key of the control unit; and
apply control, based on the decrypted message, to a second vehicle to which control is to be applied.