title: What's the key to the field "this certificate is encoded for the following purpose(s)" in ssl certificates?
body: <p>In the property page of an SSL certificate (accessible in windows using mmc/certificates), each certificate is associated with a set of intended purposes looking either like this :</p>
  <blockquote>
  <p>Protects e-mail messages</p>
  <p>Proves your identity to a remote computer</p>
  <p>Ensures the identity of a remote computer</p>
  <p>Ensures software came from software publisher</p>
  <p>Protects software from alteration after publication</p>
  <p>All issuance policies</p>
  </blockquote>
  <p>Or like this :</p>
  <blockquote>
  <p>1.3.6.1.4.1.6449.1.2.1.3.4</p>
  </blockquote>
  <p>How can I get the correspondance between those strings and a human-readable format ?</p>