title: Decrypt String with Crypto
body: <p>the Play Framework 2.0 provides the lib <strong>Crypto</strong>, see code: <a href="https://github.com/playframework/Play20/blob/master/framework/src/play/src/main/scala/play/api/libs/Crypto.scala">https://github.com/playframework/Play20/blob/master/framework/src/play/src/main/scala/play/api/libs/Crypto.scala</a></p>
  
  <p>So If want to sign a value I can use:</p>
  
  <pre><code>Crypto.sign(username);
  </code></pre>
  
  <p>But how to decrypt the username again? There is not method <strong>unsign</strong> or <strong>decrypt</strong>? Or am I missing something here?</p>