Authentication procedure an external device to a vehicle in a bus system of a motor vehicle having control instruments, wherein - the system bus an authentication device is provided, - the authentication device transmits a query authentication to the external device to the vehicle, - the external device to the vehicle signs the authentication request with a secret key of an asymmetric key pair, especially a secret key public-key pair, and transmits the authentication request signed the authentication device, - the authentication device obtains a signature of the authentication request using the same algorithm as the external vehicle and device, wherein - the signature transmitted by the external device to the vehicle is decrypted using the complementary public key of the secret key and comparing the derived signature to the transmitted.
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