Vehicle Communication Key Rotation for Cracked-Key Security

The patent implements dynamic key management by enabling both the terminal and in-vehicle device to change their encryption keys independently when specific conditions are met. This dynamic key rotation mechanism ensures that even if one key is compromised, the system can update to new keys, making the security system adaptive rather than static.

The patent establishes preliminary key change conditions that are set in advance for both devices. These pre-defined conditions (such as communication failure detection, time-based triggers, or event-based triggers) enable the system to proactively change keys before a potential security breach can be exploited, rather than reacting after compromise is detected.

The patent incorporates feedback mechanisms where both the terminal and in-vehicle device monitor communication status and independently determine when key changes are necessary. Each device has the autonomy to detect communication failures or security risks and trigger key changes based on predefined conditions, eliminating the need for complex centralized key management while maintaining security.

Both the terminal and in-vehicle device are equipped with self-service capabilities to independently change their own encryption keys when conditions are satisfied. This self-service approach allows each device to manage its own security credentials without requiring complex coordination protocols or centralized authority, reducing overall system complexity while enhancing security responsiveness.