Saha-Edge enables secure, offline certificate validation for EV chargers using Public Key Infrastructure (PKI) and zero-trust principles by storing trusted certificates locally and validating credentials without relying on cloud-based Certificate Revocation Lists (CRL) or Online Certificate Status Protocol (OCSP) services.
How Saha-Edge Implements Local PKI Validation
Saha-Edge embeds a secure certificate store within its edge computing platform, allowing chargers to validate authentication tokens and digital signatures directly from local memory. This approach eliminates the need for real-time connectivity to external validation services, which can be unreliable or unavailable in remote or low-bandwidth environments.
The system uses pre-loaded root certificates and intermediate CA certificates to verify the authenticity of charging sessions. It supports certificate pinning and can be configured to reject any certificate not explicitly trusted, aligning with zero-trust security models that assume no implicit trust.
This local validation ensures that even if network connectivity is lost, the charger can continue to operate securely, maintaining compliance with security standards such as ISO 15118 and NIST guidelines for secure EV charging.
Practical Benefits for Charge Point Operators
For Charge Point Operators (CPOs), Saha-Edge’s offline validation capability reduces dependency on cloud infrastructure and improves resilience during network outages. It also simplifies compliance with regulatory frameworks that require secure, authenticated charging sessions, especially in public and fleet applications.
Operators can deploy chargers in areas with limited internet access, such as rural locations or underground parking, without compromising security. The platform supports dynamic updates of certificate trust lists through secure over-the-air (OTA) mechanisms when connectivity is restored, ensuring long-term maintainability.
This feature is particularly valuable for large-scale deployments where consistent uptime and security are critical. It allows CPOs to maintain control over their charging infrastructure while meeting evolving cybersecurity requirements.
Related Reading
For more on related topics, see: SAHA Edge — Edge EV Charge Management System | Tecell.
Further reading: EV Charge Management Software Global | Europe, UK, US | Tecell CMS
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