V2X Communication Key Rotation for Offline Network Gaps
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Solution Overview
Problem
Existing V2X communication systems require real-time network connectivity for key updates, leading to communication disruptions in areas without network coverage.
Innovation Solution
A method for updating V2X communication keys that allows terminal devices to store multiple keys with time-based status information, enabling them to perform encryption and decryption without continuous network connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices obtain communication keys from the cloud V2X service platform in real-time, then key security and freshness are improved, but communication availability deteriorates in areas without network coverage
Solution Approach 1:
The terminal device pre-obtains multiple batches of V2X communication key information (including multiple V2X communication keys and time information) from the cloud V2X service platform before network disconnection occurs. This preliminary action ensures that sufficient valid keys are stored locally to maintain communication during offline periods without compromising security.
Solution Approach 2:
The system dynamically selects appropriate keys based on current time and validity periods. The terminal device determines which key batch is currently valid by comparing local time with time information associated with each key batch, enabling adaptive key selection that maintains both security and communication continuity.
2Adaptability or versatility
If multiple batches of key information are stored locally, then communication continuity is improved during offline periods, but device complexity increases
Solution Approach 1:
Each key batch is associated with time information parameters (such as validity periods or timestamps) that automatically change over time. The terminal device uses these parameter changes to determine which keys are currently valid, simplifying the management complexity by using time-based automatic expiration rather than manual key rotation.
Solution Approach 2:
The key information is segmented into multiple discrete batches, each with its own validity period. This segmentation allows the system to manage keys in manageable units rather than as a single complex key system, reducing overall management complexity while ensuring continuity.
3Device complexity
If key update is performed only on the cloud platform, then system simplicity is improved, but key sharing consistency deteriorates when devices are offline
Solution Approach 1:
Terminal devices perform preliminary key acquisition by obtaining multiple batches of key information in advance from the cloud platform before potential disconnection. This preliminary action ensures that devices have local copies of valid keys, maintaining key sharing consistency across the network even when individual devices are offline during key update periods.
Data Source
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AI summary
This application provides a method for updating a V2X communication key, and relates to the field of vehicle-to-everything technologies. The method includes: receiving, by a first terminal device, an Nth batch of key information sent by a server, where the Nth batch of key information includes x V2X communication keys and time information corresponding to each of the x V2X communication keys, N is an integer greater than or equal to 1, and x is an integer greater than 1; selecting, by the first terminal device, a first V2X communication key from the x V2X communication keys based on local system time and the time information corresponding to each key; and encrypting, by the first terminal device, V2X data by using the first V2X communication key, to obtain encrypted V2X data. Based on the method, the first terminal device may update a batch of key information from the server at a time, and therefore does not need to update the key information from the server in real time. Therefore, based on the method, a terminal device that does not have a real-time network connection capability can normally perform V2X communication.