Authentication of control units in a vehicle

摘要

A control unit transmits an authentication request to an authentication device via the bus system. The authentication device signs the authentication request using a first symmetric key and transmits the signed authentication request or only the signature to the control unit. The control unit compares the transmitted signature of the authentication request with a signature, which is determined by the control unit by applying the symmetric key to the authentication request, and/or the control unit decodes the transmitted signature of the authentication request using the first symmetric key to obtain a first hash value; and the control unit applies a hash algorithm to the authentication request to obtain a second hash value. The control unit is rendered operational if the comparison of the signatures and/or the hash values is positive or if the signatures and/or the hash values match.