title: How to reset the root key / offline key in docker?
body: <p>According to Docker Documentation: <a href="https://docs.docker.com/engine/security/trust/trust_key_mng/" rel="nofollow noreferrer">Manage keys for content trust</a>, the root key is :</p>
  <blockquote>
  <p>Root of content trust for an image tag. When content trust is enabled, you create the root key <strong>once</strong>. Also known as the offline key, because it should be kept offline.</p>
  </blockquote>
  <p>I don't know the exact meaning of &quot;<strong>once</strong>&quot;. Do I only have one chance to set the root key? If dismissing subsequent consequences of these uploaded repositories, what should I do to reset it?</p>