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

Claim 10:
11. A grouping of control units, comprising:
at least one first control unit disposed in a first vehicle; and
a second control unit disposed in a second vehicle;
wherein each respective control unit of the first and second control units is configured to:
receive a signal encompassing a message encrypted using a valid symmetrical key of a respective other one of the first and second control unit;

ascertain a decryptability of the encrypted message using: (i) a valid symmetrical key of the respective control unit, or (ii) a symmetrical reserve key of the control unit ascertained using the respective control unit, wherein in order to ascertain the decryptability of the encrypted message, each respective 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 respective control unit, or (ii) the symmetrical reserve key of the respective control unit; and
apply control, based on the decrypted message, to a respective one of the first and second vehicles within which the respective control unit is disposed.