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Secure EV Charging System with Self-Signed TLS Certificates

This guide provides step-by-step instructions for setting up TLS encryption between an EV Charging Station (EVCS) and a Charging Station Management System (CSMS) using self-signed certificates.

Prerequisites

  • Two separate virtual machines (VMs) for EVCS and CSMS.
  • OpenSSL installed on both VMs.
  • Basic knowledge of Linux command-line operations.

Step 1: Generate Self-Signed Certificates

Generate Certificate for EVCS

Run the following command inside the EVCS VM:

openssl req -x509 -newkey rsa:4096 -keyout evcs_key.pem -out evcs_cert.pem -days 365 -nodes -subj "/CN=EVCS"

Generate Certificate for CSMS

openssl req -x509 -newkey rsa:4096 -keyout csms_key.pem -out csms_cert.pem -days 365 -nodes -subj "/CN=CSMS"

Step 2: Exchange Certificates

Transfer the EVCS certificate to CSMS

On the EVCS VM, copy evcs_cert.pem to the CSMS VM using SCP:

scp evcs_cert.pem user@csms-vm:/path/to/store/

Transfer the CSMS certificate to EVCS

On the CSMS VM, copy csms_cert.pem to the EVCS VM using SCP:

scp csms_cert.pem user@evcs-vm:/path/to/store/

Make sure that the TEVCS.py on line(25) is set up correctly in the line for server_host = "Certificate Name" Certificate Name = CSMS.