Secure and manipulation-proof TLS communication with Plug and Charge

Abstract

PnC according to ISO 15118 enables most secure charging session and highest comfort for user and secure and manipulation-proof communication between electric vehicle and charging station. This secure communication is ensured by encrypted communication channel and asymmetric cryptographic algorithms using PKI. The encrypted communication channel between EV and EVSE must be ensured by using Transport Layer Security (TLS) according to ISO 15118. To realize V2G communication between EV and EVSE, first line certificates between EV and EVSE must be validated and verified. Due to new standard for TLS and due to new PKIs the requirements for TLS are significantly changed. With this work all requirements for TLS are collected, evaluated and solution concepts for secure realization of TLS function are derived. Here new concepts and solutions for secure TLS are developed, which are based on Cross Certificate Sign and on use of the network solutions within the PnC Ecosystem. These solutions are validated and verified in a testbench, and it is ensured that secure TLS function is also possible without Interoperable PKIs. So, a user can establish a secure TLS function at the charging station.