Patent ID: 11916904
Assignee: DENSO CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 2:
3. The electronic control unit according to claim 1, further comprising:
a verification MAC generator unit configured to generate a verification message authentication code from the message and the received value in response to the verification result by the freshness value verifier unit indicating that (i) the received value is not larger than the reference value and not smaller than the permissible value and (ii) the received value is not in the freshness value list; and
a MAC verifier unit,
wherein:
the receiver is further configured to receive a message authentication code given to the message;
the MAC verifier unit is configured to verify an identity between the message authentication code and the verification message authentication code; and
the list update unit is further configured to update the freshness value list so as to hold the received value in response to the identity being affirmatively verified between the message authentication code and the verification message authentication code.