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CA Capability Matrix

CapabilityMicrosoft AD CSSmallstep CA
Enroll
Renew
Revoke
Template Discovery
Template Selection
ACME Protocol
Kerberos Auth
API Auth
Bulk Enrollment
Custom Attributes
CASupported Auth Methods
Microsoft AD CSKerberos, NTLM, Certificate
Smallstep CAACME Account Key
CASupported Validation
Microsoft AD CSTemplate-based
Smallstep CADNS-01, HTTP-01, TLS-ALPN-01