title: Can an OpenPGP public key without UID exist?
body: <p>Is below key valid? </p>
  
  <p>The <code>gpg --list-keys</code> command lists the key information which has no label/email to it, I mean UID:</p>
  
  <pre><code>/home/XXXXXX/.gnupg/pubring.gpg
  --------------------------------
  pub   2048R/3BAAF156 2016-04-05
  uid
  </code></pre>
  
  <p>Is it a valid key? Source said they are using Oracle Fusion Middleware pgp to generate the key.</p>
  
  <p>How can I encrypt files using the key which has no UID?</p>