Distributing secret keys for managing access to ECUs

Abstract

A system and method of controlling access to electronic control units (ECUs) includes: receiving, at an ECU supplier computer, a supplier encryption key derived from a master encryption key using a supplier identifier that identifies an ECU supplier; issuing an ECU identifier that identifies an ECU and includes the supplier identifier; generating for the ECU an ECU unlock authorization key using the supplier encryption key and the ECU identifier; and storing the ECU unlock authorization key and the ECU identifier in the ECU.

Description

Technical field [0001] The present invention relates to an electronic control unit (ECU), and more specifically to the use of a cryptographic key system to control access to the ECU. Background technique [0002] Many vehicles and other devices include electronic control units (ECUs) that manage multiple tasks. The ECU can be programmed to execute computer-readable instructions and control mechanical and / or electrical devices based on these instructions. For example, the powertrain control module (PCM) can act as the central decision-making management organization of the vehicle's powertrain and take the form of an ECU that achieves this purpose. Multiple vehicle engine parameters can be controlled by the PCM, such as the ignition timing of the internal combustion engine (ICE) or the exhaust gas recirculation (EGR) valve. [0003] Manufacturers of vehicles or devices may wish to regulate access to ECU commands or other operational aspects. Using the example of the PCM described ...

AI Technical Summary

Problems solved by technology

However, such a system can be problematic

Considering the volume of ECUs manufactured, maintaining a database including all ECU unlocking keys consumes a significant amount of computing space and resources

Creating such a database can be complex and difficult, given that ECUs may not be manufactured by a single manufacturer, but by several different manufacturers

Furthermore, if the data included in the database becomes corrupted, many, if not all, of the ECUs identified in the database may not be accessible

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