Can you load a modern key having the same KMID previously loaded into another ECU?

• A. No, it's prohibited
• B. Yes, it is allowed
• C. Only with special permission
• D. It depends on the ECU type

Answer: (A)

Loading a modern key with the same Key Management ID (KMID) that has previously been loaded into another Electronic Control Unit (ECU) is generally prohibited due to security protocols in place to safeguard communication and data integrity. The prohibition ensures that keys are not reused across different ECUs, thus minimizing the risk of potential vulnerabilities and unauthorized access. Each ECU is designed to have its own unique key management strategy, which includes strict controls over key generation, distribution, and usage.

In systems where security is paramount, allowing the reuse of keys across different devices could lead to critical weaknesses, making it easier for attackers to compromise the system. The policy of prohibition reinforces a strong security posture by promoting unique key associations to each device or ECU, thus enhancing the overall security mechanism within communication systems.