title: How to store a "secret" string in a Windows Store App Package
body: <p>As you probably know, it's incredibly easy to dig into the source code of a Windows Store App, made with HTML, CSS and JS. </p>
  
  <p>My app uses a REST API which starts a quite expensive operation on a server. To save CPU resources the API uses something like an HMAC. To generate the HMAC, a secret is needed. How can I securely save that secret? I'm searching for something like the iOS keystore.</p>