ISO 15118 ensures secure key exchange during Plug & Charge sessions in mixed-connector environments through standardized cryptographic protocols and mutual authentication mechanisms. It defines a common framework for secure communication between EVs and charging stations, regardless of the physical connector type used.
How the protocol handles different connector types
ISO 15118 operates independently of physical connector standards like CCS, CHAdeMO, or Type 2. It uses a unified communication layer that abstracts the connector differences. This allows the same secure key exchange process to work across various hardware configurations. The protocol defines specific message flows for authentication and key agreement that remain consistent, even when the underlying physical connection changes.
For mixed-connector environments, the charging station identifies the EV’s capabilities during the initial handshake. It then selects the appropriate cryptographic methods based on the EV’s supported security profiles. This ensures that the key exchange remains secure and compliant, regardless of whether the EV uses a CCS or CHAdeMO connector.
Practical implications for charging infrastructure operators
For operators managing fleets or multi-brand charging networks, ISO 15118 simplifies compliance and interoperability. It eliminates the need for separate security implementations for different connector types. Operators can rely on a single, standardized approach to secure charging sessions.
This standard also supports dynamic pricing and load management features. The secure key exchange enables operators to authenticate users and manage access rights without requiring physical cards or manual verification. The protocol’s flexibility allows for seamless integration with existing infrastructure while maintaining high security standards.
Related Reading
For more on related topics, see: Plug & Charge: Simplifying the EV Charging Payment Experience.
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