orization Policy Trust Domain Migration</a></li></ul></li><li role=none><a role=treeitem title="Shows how system administrators can configure Istio's CA with an existing root certificate, signing certificate and key." href=/v1.5/docs/tasks/security/plugin-ca-cert/>Plugging in existing CA Certificates</a></li><li role=none><a role=treeitem title="Shows how to provision and manage DNS certificates in Istio." href=/v1.5/docs/tasks/security/dns-cert/>Istio DNS Certificate Management</a></li></ul></li><li role=t