Patent ID: 8577036

Claim:
A method for transmitting a message in real time between users in a closed network of a vehicle, the method which comprises: in an encryption unit, encrypting safety-relevant real-time data of a message and a transmitter ID of a transmitter using a private key of the transmitter in order to generate an encrypted message; transmitting the encrypted message, which includes the safety-relevant real-time data and the transmitter ID, together with an unencrypted transmitter ID of the transmitter which is in unencrypted form, from the transmitter to a receiver within the closed network via a vehicle bus; in the receiver, receiving the encrypted message and the unencrypted transmitter ID; using the unencrypted transmitter ID that was received by the receiver to obtain a public key of the transmitter; in a decryption unit, decrypting the encrypted message received by the receiver using the public key of the transmitter to obtain the safety-relevant real-time data and a decrypted transmitter ID; and comparing the unencrypted transmitter ID with the decrypted transmitter ID in order to determine whether the message has been transmitted correctly.