Abstract: An interface of a certificate management system acts as a target for management of digital authentication certificates from a group of candidate certificate authorities. Entities make certificate signing requests on behalf of subjects. The requests are received at an interface that appears to the requesting entities as a sole source of the signed certificates. But a certificate management component that processes the requests received by the interface applies a selection technique to select a particular certificate authority from a group of candidate certificate authorities available to sign the certificates. The certificate management component forwards the request to the particular certificate authority, receives back the signed certificate, and responds to the certificate signing request with the signed certificate. Although the certificate signing requests were all made via a same interface, the signed certificates can have different chains of trust. Various criteria may be used for the selection.