Vehicle bus message authentication using watermarking
AssigneeFord Global Technologies, LLC
InventorsAlan J. Michaels, James Martin Lawlis, Sai Srikar Palukuru, John Moore
Life of this patent
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Abstract
An electronic control unit comprises circuitry to receive a combined signal via a vehicle bus of a vehicle, wherein the combined signal contains a combination of a data signal and a watermark signal, which can be a radio frequency (RF) signal or an analog baseband signal, wherein the data signal includes a message, circuitry to extract a watermark from the watermark signal, circuitry to verify the watermark based on a comparison of the watermark with a pre-defined watermark, circuitry to extract the data signal from the combined signal and obtain the message from the data signal, and circuitry to authenticate the message based on the verification of the watermark.
Claims20
An electronic control unit, comprising:
- circuitry to receive a combined signal via a vehicle bus of a vehicle, wherein the combined signal contains a combination of a data signal and a watermark signal, wherein the data signal includes a message, wherein the data signal is a differential-mode signal;
- circuitry to extract the data signal from the combined signal and obtain the message from the data signal;
- circuitry to extract a watermark from the watermark signal, wherein the watermark signal is a common-mode signal;
- circuitry to verify the watermark based on a comparison of the watermark with a pre-defined watermark;
- and
- circuitry to send a verification result to cause authentication of the message based on the verification of the watermark.
A method, comprising:
- encoding a message for transmission over a vehicle bus of a vehicle;
- generating a data signal including the encoded message;
- generating a watermark signal, wherein the watermark signal conveys a watermark, and wherein the data signal is a differential-mode signal, and wherein the watermark signal is a common-mode signal;
- combining the data signal and the watermark signal, to obtain a combined signal;
- and
- transmitting the combined signal over the vehicle bus.
An electronic control unit, comprising:
- circuitry to receive a combined signal via a vehicle bus of a vehicle, wherein the combined signal contains a combination of a data signal and a watermark signal, wherein the data signal includes a message, wherein the data signal is a differential-mode signal;
- circuitry to extract the data signal from the combined signal and obtain the message from the data signal;
- circuitry to extract a watermark from the watermark signal;
- circuitry to verify the watermark based on a comparison of the watermark with a pre-defined watermark;
- and
- circuitry to send a verification result to cause authentication of the message based on the verification of the watermark.
Dependencies are inferred from the claim text.