Certificate management is the process of issuing, deploying, rotating, monitoring, and revoking digital certificates used to secure communications and authenticate devices and servers. In EV charging, certificate management is essential for secure charger-to-backend connectivity (often OCPP over TLS) and for advanced vehicle-to-charger trust models (such as ISO 15118 Plug & Charge).
What Is Certificate Management?
Digital certificates (typically X.509) prove identity in encrypted communications. Certificate management covers the full lifecycle:
– Certificate issuance (creating certificates for chargers, servers, or users)
– Secure distribution and installation on devices and back-end systems
– Renewal and rotation before expiry
– Revocation when a certificate is compromised or a device is decommissioned
– Tracking validity, ownership, and device mapping (serial/asset ID to cert)
– Auditing and logging for security and compliance
Without strong certificate management, secure charging operations become fragile—expiring certificates can break connectivity, and weak processes can increase cyber risk.
Why Certificate Management Matters in EV Charging
EV chargers are networked assets often deployed across many sites and countries. Certificate management matters because it:
– Enables encrypted communications and prevents man-in-the-middle attacks
– Protects operational data and billing data integrity
– Reduces fraud risk and unauthorized remote control of chargers
– Improves resilience by preventing outages caused by certificate expiry
– Supports tender requirements related to charger cybersecurity
– Enables scalable fleet and public network operations with consistent security controls
For large CPO deployments, certificate lifecycle failures can cause widespread “offline charger” events.
Where Certificates Are Used in EV Charging
Common certificate use cases include:
– OCPP security
– Charger-to-backend communication secured with TLS
– Mutual TLS (mTLS) where both charger and server present certificates
– ISO 15118 Plug & Charge
– Certificate chains used to authenticate EVs, chargers, and service providers
– Enables automatic authentication without RFID or apps
– Platform and API security
– Certificates for secure API calls between back-end systems, payment services, and roaming hubs
– Internal site infrastructure
– VPNs, gateways, routers, and firewalls that connect charger networks securely
How Certificate Management Works
A typical certificate management setup includes:
– Define trust model and PKI
– Decide who operates the certificate authority (CA) or which trusted CA is used
– Define certificate hierarchies and trust chains
– Device onboarding
– Generate keys securely (ideally on device or via secure provisioning)
– Issue certificates and bind them to charger identity (serial number, asset ID)
– Store private keys securely and restrict access
– Monitoring and renewal
– Track certificate validity dates and set automated renewal windows
– Alert before expiry and verify successful installation
– Maintain rollback processes for failed updates
– Revocation and offboarding
– Revoke certificates for compromised devices, stolen hardware, or decommissioned chargers
– Update revocation lists or OCSP responders depending on the model
– Ensure old certificates cannot reconnect to the backend
– Governance and audit
– Document processes, roles, and access control
– Log certificate events (issuance, renewal, revocation) for incident response
Typical Use Cases
– CPO managing thousands of OCPP-connected chargers across multiple countries
– OEM provisioning chargers with unique device certificates at manufacturing stage
– Plug & Charge rollout using ISO 15118 certificate ecosystems
– Migration from shared credentials to certificate-based identity
– Responding to security incidents by revoking affected device certificates
Key Benefits of Good Certificate Management
– Stronger cybersecurity and reduced unauthorized access risk
– More reliable connectivity through proactive renewal and monitoring
– Better compliance readiness for tenders and enterprise customers
– Scalable onboarding and offboarding of chargers and service partners
– Improved data integrity for billing, roaming, and operational reporting
Limitations to Consider
– Operational complexity increases with scale and multi-vendor environments
– Certificate renewal failures can cause widespread downtime if not automated
– Secure key storage and provisioning is critical and can be difficult on constrained devices
– Plug & Charge certificate ecosystems add additional stakeholders and governance requirements
– Requires well-defined roles, access controls, and incident response procedures
Related Glossary Terms
Charger Cybersecurity
OCPP
OCPP Security
TLS
Mutual TLS (mTLS)
ISO 15118
Plug & Charge
Hardware Root of Trust
Intrusion Detection System (IDS)
Back-End Systems