av></article><nav class=pagenav><div class=left><a title="This task shows you how to integrate a Vault Certificate Authority with Istio for mutual TLS." href=/v1.1/docs/tasks/security/vault-ca/><svg class="icon"><use xlink:href="/v1.1/img/icons.svg#left-arrow"/></svg>Istio Vault CA Integration</a></div><div class=right><a title="Shows how operators can configure Citadel with existing root certificate, signing certificate and key." href=/v1.1/docs/tasks/security/plugin-ca-cert/>Plugging in External CA Key an