# Configuration Protocol Support

emCA supports standard protocols for automated certificate enrolment and lifecycle operations.

* **ACME (Automatic Certificate Management Environment)** Implements ACME APIs for automated enrolment and renewal. Integrates with ACME clients and enforces CA policy and auditing.
* **EST (Enrollment over Secure Transport)** Provides enrolment over HTTPS with proof-of-possession. Supports initial enrollment and re-enrolment with client authentication.
* **CMP (Certificate Management Protocol)**
   Supports issuance, renewal, revocation, and key update. Operates over standard transports and aligns with enterprise policy controls.
* **SCEP (Simple Certificate Enrollment Protocol)**
   Enables device enrollment in constrained or network-appliance environments. Supports request/renew flows suitable for MDMs, firewalls, and routers.