EV Charging Authentication via CAN and Mobile Network Mediation
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Solution Overview
Problem
The limited bandwidth of the Controller Area Network (CAN) bus in electric vehicle charging systems makes it difficult to perform large data transmissions and secure communication between electric vehicles and charging spots, leading to security vulnerabilities such as tampering and information leakage.
Innovation Solution
Establishing multiple connections using a CAN bus for the electric vehicle and a mobile communication network for the charging management system to facilitate identity authentication and key negotiation, with the charging management system forwarding messages and verifying digital signatures to enhance security and reduce verification workload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If identity authentication and key negotiation are performed directly between electric vehicle and charging spot using CAN bus, then communication security is improved, but the limited bandwidth of CAN bus causes communication efficiency to deteriorate
Solution Approach 1:
The patent introduces a charging management system as an intermediary component that facilitates authentication and key negotiation between the electric vehicle and charging spot. The system receives authentication requests from the electric vehicle, performs verification, and establishes secure communication channels, thereby resolving the bandwidth limitation of CAN bus while maintaining security requirements
Solution Approach 2:
The patent segments the authentication process into multiple stages: initial connection establishment via CAN bus, authentication request forwarding to charging management system, verification processing, and secure channel establishment. This segmentation allows complex security operations to be performed outside the bandwidth-constrained CAN bus environment
2Reliability
If digital signature verification is performed between electric vehicle and charging spot, then authentication security is improved, but verification workload increases
Solution Approach 1:
The charging management system acts as a mediator that performs digital signature verification on behalf of both the electric vehicle and charging spot. By centralizing the verification workload in the charging management system, the patent reduces the computational burden on the electric vehicle and charging spot while maintaining strong authentication security through proper digital signature verification
Data Source
AI summary
A charging authentication method is performed by an electric vehicle and comprises establishing a first connection between the electric vehicle and a charging spot using a controller area network (CAN) bus, establishing a second connection between the electric vehicle and a charging management system using a mobile communication network, sending a charging request message to the charging spot using the first connection, and performing identity authentication and key negotiation with the charging spot using the second connection and a third connection between the charging spot and the charging management system.