Vehicle Terminal Session Key Generation for Platoon Latency Reduction
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Solution Overview
Problem
Current communication systems in vehicle platoons face challenges in reducing computational effort and data size for encryption, leading to increased latency and safety distance between vehicles, which affects fuel efficiency and drive energy utilization.
Innovation Solution
A vehicle-side terminal system that determines a symmetrical key independently and locally, using it to generate a session key for secure communication channels, reducing the need for certificate management and enhancing communication efficiency by changing session keys and identifiers synchronously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If asymmetric encryption methods are used for secure communication between vehicles, then communication security is improved, but computational effort and data size increase, leading to increased latency
Solution Approach 1:
The patent segments the encryption system into two parts: asymmetric encryption for key exchange (security-critical) and symmetric encryption for data transmission (efficiency-critical). This segmentation allows each encryption type to be used where it is most effective, resolving the contradiction between security and latency.
Solution Approach 2:
The patent performs preliminary key exchange using asymmetric encryption before data transmission, establishing symmetric keys in advance. This preliminary action allows subsequent data transmission to use faster symmetric encryption, reducing overall latency while maintaining security.
2Reliability
If asymmetric encryption methods are used for secure communication between vehicles, then communication security is improved, but the size of encrypted data increases
Solution Approach 1:
The patent segments the encryption system into two parts: asymmetric encryption for key exchange (security-critical) and symmetric encryption for data transmission (efficiency-critical). This segmentation allows each encryption type to be used where it is most effective, resolving the contradiction between security and data size.
Solution Approach 2:
The patent uses symmetric keys as copies that can be efficiently transmitted and reused for data encryption. Instead of using large asymmetric encryption for all data, symmetric keys serve as compact copies that enable efficient encryption/decryption of the actual data payload.
3Reliability
If session keys are changed frequently to improve security, then communication security is improved, but computational effort and identifier management complexity increase
Solution Approach 1:
The patent merges the session key with the identifier used for addressing vehicles. This combination means that when the identifier changes, the session key automatically changes as well, simplifying management while maintaining security through frequent key changes.
Solution Approach 2:
The patent makes the identifier serve dual functions: both for addressing vehicles and for encryption/decryption. This multi-functionality reduces the number of separate components that need to be managed, simplifying the system while enabling frequent key changes for security.
Data Source
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AI summary
A method for operating a vehicle-side terminal (NNa) comprises: determining a symmetric key, randomly determining an input value, sending a first message comprising the symmetric key and the input value towards a second vehicle-side terminal, determining a session key depending on the symmetric key and depending on the input value, selecting the determined session key as the currently valid session key, receiving a second message comprising encrypted data from the second vehicle-side terminal, and determining unencrypted data depending on the encrypted data and the currently valid session key.